1/*
   2 * probe-event.c : perf-probe definition to probe_events format 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 <inttypes.h>
  23#include <sys/utsname.h>
  24#include <sys/types.h>
  25#include <sys/stat.h>
  26#include <fcntl.h>
  27#include <errno.h>
  28#include <stdio.h>
  29#include <unistd.h>
  30#include <stdlib.h>
  31#include <string.h>
  32#include <stdarg.h>
  33#include <limits.h>
  34#include <elf.h>
  35
  36#include "util.h"
  37#include "event.h"
  38#include "strlist.h"
  39#include "strfilter.h"
  40#include "debug.h"
  41#include "cache.h"
  42#include "color.h"
  43#include "symbol.h"
  44#include "thread.h"
  45#include <api/fs/fs.h>
  46#include "trace-event.h"	/* For __maybe_unused */
  47#include "probe-event.h"
  48#include "probe-finder.h"
  49#include "probe-file.h"
  50#include "session.h"
  51#include "string2.h"
  52
  53#include "sane_ctype.h"
  54
 
  55#define PERFPROBE_GROUP "probe"
  56
  57bool probe_event_dry_run;	/* Dry run flag */
  58struct probe_conf probe_conf;
  59
  60#define semantic_error(msg ...) pr_err("Semantic error :" msg)
  61
  62int e_snprintf(char *str, size_t size, const char *format, ...)
  63{
  64	int ret;
  65	va_list ap;
  66	va_start(ap, format);
  67	ret = vsnprintf(str, size, format, ap);
  68	va_end(ap);
  69	if (ret >= (int)size)
  70		ret = -E2BIG;
  71	return ret;
  72}
  73
 
  74static struct machine *host_machine;
  75
  76/* Initialize symbol maps and path of vmlinux/modules */
  77int init_probe_symbol_maps(bool user_only)
  78{
  79	int ret;
  80
  81	symbol_conf.sort_by_name = true;
  82	symbol_conf.allow_aliases = true;
  83	ret = symbol__init(NULL);
  84	if (ret < 0) {
  85		pr_debug("Failed to init symbol map.\n");
  86		goto out;
  87	}
  88
  89	if (host_machine || user_only)	/* already initialized */
  90		return 0;
  91
  92	if (symbol_conf.vmlinux_name)
  93		pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
  94
  95	host_machine = machine__new_host();
  96	if (!host_machine) {
  97		pr_debug("machine__new_host() failed.\n");
  98		symbol__exit();
  99		ret = -1;
 100	}
 101out:
 102	if (ret < 0)
 103		pr_warning("Failed to init vmlinux path.\n");
 104	return ret;
 105}
 106
 107void exit_probe_symbol_maps(void)
 108{
 109	machine__delete(host_machine);
 110	host_machine = NULL;
 
 
 111	symbol__exit();
 112}
 113
 114static struct symbol *__find_kernel_function_by_name(const char *name,
 115						     struct map **mapp)
 116{
 117	return machine__find_kernel_function_by_name(host_machine, name, mapp);
 
 118}
 119
 120static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
 121{
 122	return machine__find_kernel_function(host_machine, addr, mapp);
 123}
 124
 125static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
 126{
 127	/* kmap->ref_reloc_sym should be set if host_machine is initialized */
 128	struct kmap *kmap;
 129	struct map *map = machine__kernel_map(host_machine);
 130
 131	if (map__load(map) < 0)
 132		return NULL;
 133
 134	kmap = map__kmap(map);
 135	if (!kmap)
 136		return NULL;
 137	return kmap->ref_reloc_sym;
 138}
 139
 140static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
 141					     bool reloc, bool reladdr)
 142{
 143	struct ref_reloc_sym *reloc_sym;
 144	struct symbol *sym;
 145	struct map *map;
 146
 147	/* ref_reloc_sym is just a label. Need a special fix*/
 148	reloc_sym = kernel_get_ref_reloc_sym();
 149	if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
 150		*addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
 151	else {
 152		sym = __find_kernel_function_by_name(name, &map);
 153		if (!sym)
 154			return -ENOENT;
 155		*addr = map->unmap_ip(map, sym->start) -
 156			((reloc) ? 0 : map->reloc) -
 157			((reladdr) ? map->start : 0);
 158	}
 159	return 0;
 160}
 161
 162static struct map *kernel_get_module_map(const char *module)
 163{
 164	struct map_groups *grp = &host_machine->kmaps;
 165	struct maps *maps = &grp->maps[MAP__FUNCTION];
 166	struct map *pos;
 167
 168	/* A file path -- this is an offline module */
 169	if (module && strchr(module, '/'))
 170		return dso__new_map(module);
 171
 172	if (!module)
 173		module = "kernel";
 174
 175	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 176		/* short_name is "[module]" */
 177		if (strncmp(pos->dso->short_name + 1, module,
 178			    pos->dso->short_name_len - 2) == 0 &&
 179		    module[pos->dso->short_name_len - 2] == '\0') {
 180			map__get(pos);
 181			return pos;
 182		}
 183	}
 184	return NULL;
 185}
 186
 187struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
 188{
 189	/* Init maps of given executable or kernel */
 190	if (user) {
 191		struct map *map;
 192
 193		map = dso__new_map(target);
 194		if (map && map->dso)
 195			map->dso->nsinfo = nsinfo__get(nsi);
 196		return map;
 197	} else {
 198		return kernel_get_module_map(target);
 
 
 
 
 
 
 
 199	}
 200}
 201
 
 202static int convert_exec_to_group(const char *exec, char **result)
 203{
 204	char *ptr1, *ptr2, *exec_copy;
 205	char buf[64];
 206	int ret;
 207
 208	exec_copy = strdup(exec);
 209	if (!exec_copy)
 210		return -ENOMEM;
 211
 212	ptr1 = basename(exec_copy);
 213	if (!ptr1) {
 214		ret = -EINVAL;
 215		goto out;
 216	}
 217
 218	for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
 219		if (!isalnum(*ptr2) && *ptr2 != '_') {
 220			*ptr2 = '\0';
 221			break;
 222		}
 223	}
 224
 225	ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
 226	if (ret < 0)
 227		goto out;
 228
 229	*result = strdup(buf);
 230	ret = *result ? 0 : -ENOMEM;
 231
 232out:
 233	free(exec_copy);
 234	return ret;
 235}
 236
 237static void clear_perf_probe_point(struct perf_probe_point *pp)
 238{
 239	free(pp->file);
 240	free(pp->function);
 241	free(pp->lazy_line);
 242}
 243
 244static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
 245{
 246	int i;
 247
 248	for (i = 0; i < ntevs; i++)
 249		clear_probe_trace_event(tevs + i);
 250}
 251
 252static bool kprobe_blacklist__listed(unsigned long address);
 253static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
 254{
 255	u64 etext_addr = 0;
 256	int ret;
 257
 258	/* Get the address of _etext for checking non-probable text symbol */
 259	ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
 260						false, false);
 261
 262	if (ret == 0 && etext_addr < address)
 263		pr_warning("%s is out of .text, skip it.\n", symbol);
 264	else if (kprobe_blacklist__listed(address))
 265		pr_warning("%s is blacklisted function, skip it.\n", symbol);
 266	else
 267		return false;
 268
 269	return true;
 270}
 271
 272/*
 273 * @module can be module name of module file path. In case of path,
 274 * inspect elf and find out what is actual module name.
 275 * Caller has to free mod_name after using it.
 276 */
 277static char *find_module_name(const char *module)
 278{
 279	int fd;
 280	Elf *elf;
 281	GElf_Ehdr ehdr;
 282	GElf_Shdr shdr;
 283	Elf_Data *data;
 284	Elf_Scn *sec;
 285	char *mod_name = NULL;
 286	int name_offset;
 287
 288	fd = open(module, O_RDONLY);
 289	if (fd < 0)
 290		return NULL;
 291
 292	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 293	if (elf == NULL)
 294		goto elf_err;
 295
 296	if (gelf_getehdr(elf, &ehdr) == NULL)
 297		goto ret_err;
 298
 299	sec = elf_section_by_name(elf, &ehdr, &shdr,
 300			".gnu.linkonce.this_module", NULL);
 301	if (!sec)
 302		goto ret_err;
 303
 304	data = elf_getdata(sec, NULL);
 305	if (!data || !data->d_buf)
 306		goto ret_err;
 307
 308	/*
 309	 * NOTE:
 310	 * '.gnu.linkonce.this_module' section of kernel module elf directly
 311	 * maps to 'struct module' from linux/module.h. This section contains
 312	 * actual module name which will be used by kernel after loading it.
 313	 * But, we cannot use 'struct module' here since linux/module.h is not
 314	 * exposed to user-space. Offset of 'name' has remained same from long
 315	 * time, so hardcoding it here.
 316	 */
 317	if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
 318		name_offset = 12;
 319	else	/* expect ELFCLASS64 by default */
 320		name_offset = 24;
 321
 322	mod_name = strdup((char *)data->d_buf + name_offset);
 323
 324ret_err:
 325	elf_end(elf);
 326elf_err:
 327	close(fd);
 328	return mod_name;
 329}
 330
 331#ifdef HAVE_DWARF_SUPPORT
 332
 333static int kernel_get_module_dso(const char *module, struct dso **pdso)
 334{
 335	struct dso *dso;
 336	struct map *map;
 337	const char *vmlinux_name;
 338	int ret = 0;
 339
 340	if (module) {
 341		char module_name[128];
 342
 343		snprintf(module_name, sizeof(module_name), "[%s]", module);
 344		map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name);
 345		if (map) {
 346			dso = map->dso;
 347			goto found;
 348		}
 349		pr_debug("Failed to find module %s.\n", module);
 350		return -ENOENT;
 351	}
 352
 353	map = machine__kernel_map(host_machine);
 354	dso = map->dso;
 355
 356	vmlinux_name = symbol_conf.vmlinux_name;
 357	dso->load_errno = 0;
 358	if (vmlinux_name)
 359		ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
 360	else
 361		ret = dso__load_vmlinux_path(dso, map);
 362found:
 363	*pdso = dso;
 364	return ret;
 365}
 366
 367/*
 368 * Some binaries like glibc have special symbols which are on the symbol
 369 * table, but not in the debuginfo. If we can find the address of the
 370 * symbol from map, we can translate the address back to the probe point.
 371 */
 372static int find_alternative_probe_point(struct debuginfo *dinfo,
 373					struct perf_probe_point *pp,
 374					struct perf_probe_point *result,
 375					const char *target, struct nsinfo *nsi,
 376					bool uprobes)
 377{
 378	struct map *map = NULL;
 379	struct symbol *sym;
 380	u64 address = 0;
 381	int ret = -ENOENT;
 382
 383	/* This can work only for function-name based one */
 384	if (!pp->function || pp->file)
 385		return -ENOTSUP;
 386
 387	map = get_target_map(target, nsi, uprobes);
 388	if (!map)
 389		return -EINVAL;
 390
 391	/* Find the address of given function */
 392	map__for_each_symbol_by_name(map, pp->function, sym) {
 393		if (uprobes)
 394			address = sym->start;
 395		else
 396			address = map->unmap_ip(map, sym->start) - map->reloc;
 397		break;
 398	}
 399	if (!address) {
 400		ret = -ENOENT;
 401		goto out;
 402	}
 403	pr_debug("Symbol %s address found : %" PRIx64 "\n",
 404			pp->function, address);
 405
 406	ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
 407					  result);
 408	if (ret <= 0)
 409		ret = (!ret) ? -ENOENT : ret;
 410	else {
 411		result->offset += pp->offset;
 412		result->line += pp->line;
 413		result->retprobe = pp->retprobe;
 414		ret = 0;
 415	}
 416
 417out:
 418	map__put(map);
 419	return ret;
 420
 421}
 422
 423static int get_alternative_probe_event(struct debuginfo *dinfo,
 424				       struct perf_probe_event *pev,
 425				       struct perf_probe_point *tmp)
 426{
 427	int ret;
 428
 429	memcpy(tmp, &pev->point, sizeof(*tmp));
 430	memset(&pev->point, 0, sizeof(pev->point));
 431	ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
 432					   pev->nsi, pev->uprobes);
 433	if (ret < 0)
 434		memcpy(&pev->point, tmp, sizeof(*tmp));
 435
 436	return ret;
 437}
 438
 439static int get_alternative_line_range(struct debuginfo *dinfo,
 440				      struct line_range *lr,
 441				      const char *target, bool user)
 442{
 443	struct perf_probe_point pp = { .function = lr->function,
 444				       .file = lr->file,
 445				       .line = lr->start };
 446	struct perf_probe_point result;
 447	int ret, len = 0;
 448
 449	memset(&result, 0, sizeof(result));
 450
 451	if (lr->end != INT_MAX)
 452		len = lr->end - lr->start;
 453	ret = find_alternative_probe_point(dinfo, &pp, &result,
 454					   target, NULL, user);
 455	if (!ret) {
 456		lr->function = result.function;
 457		lr->file = result.file;
 458		lr->start = result.line;
 459		if (lr->end != INT_MAX)
 460			lr->end = lr->start + len;
 461		clear_perf_probe_point(&pp);
 462	}
 463	return ret;
 464}
 465
 466/* Open new debuginfo of given module */
 467static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
 468					bool silent)
 469{
 470	const char *path = module;
 471	char reason[STRERR_BUFSIZE];
 472	struct debuginfo *ret = NULL;
 473	struct dso *dso = NULL;
 474	struct nscookie nsc;
 475	int err;
 476
 477	if (!module || !strchr(module, '/')) {
 478		err = kernel_get_module_dso(module, &dso);
 479		if (err < 0) {
 480			if (!dso || dso->load_errno == 0) {
 481				if (!str_error_r(-err, reason, STRERR_BUFSIZE))
 482					strcpy(reason, "(unknown)");
 483			} else
 484				dso__strerror_load(dso, reason, STRERR_BUFSIZE);
 485			if (!silent)
 486				pr_err("Failed to find the path for %s: %s\n",
 487					module ?: "kernel", reason);
 488			return NULL;
 489		}
 490		path = dso->long_name;
 491	}
 492	nsinfo__mountns_enter(nsi, &nsc);
 493	ret = debuginfo__new(path);
 494	if (!ret && !silent) {
 495		pr_warning("The %s file has no debug information.\n", path);
 496		if (!module || !strtailcmp(path, ".ko"))
 497			pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
 498		else
 499			pr_warning("Rebuild with -g, ");
 500		pr_warning("or install an appropriate debuginfo package.\n");
 501	}
 502	nsinfo__mountns_exit(&nsc);
 503	return ret;
 504}
 505
 506/* For caching the last debuginfo */
 507static struct debuginfo *debuginfo_cache;
 508static char *debuginfo_cache_path;
 509
 510static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
 511{
 512	const char *path = module;
 513
 514	/* If the module is NULL, it should be the kernel. */
 515	if (!module)
 516		path = "kernel";
 517
 518	if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
 519		goto out;
 520
 521	/* Copy module path */
 522	free(debuginfo_cache_path);
 523	debuginfo_cache_path = strdup(path);
 524	if (!debuginfo_cache_path) {
 525		debuginfo__delete(debuginfo_cache);
 526		debuginfo_cache = NULL;
 527		goto out;
 528	}
 529
 530	debuginfo_cache = open_debuginfo(module, NULL, silent);
 531	if (!debuginfo_cache)
 532		zfree(&debuginfo_cache_path);
 533out:
 534	return debuginfo_cache;
 535}
 536
 537static void debuginfo_cache__exit(void)
 538{
 539	debuginfo__delete(debuginfo_cache);
 540	debuginfo_cache = NULL;
 541	zfree(&debuginfo_cache_path);
 542}
 543
 544
 545static int get_text_start_address(const char *exec, unsigned long *address,
 546				  struct nsinfo *nsi)
 547{
 548	Elf *elf;
 549	GElf_Ehdr ehdr;
 550	GElf_Shdr shdr;
 551	int fd, ret = -ENOENT;
 552	struct nscookie nsc;
 553
 554	nsinfo__mountns_enter(nsi, &nsc);
 555	fd = open(exec, O_RDONLY);
 556	nsinfo__mountns_exit(&nsc);
 557	if (fd < 0)
 558		return -errno;
 559
 560	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 561	if (elf == NULL) {
 562		ret = -EINVAL;
 563		goto out_close;
 564	}
 565
 566	if (gelf_getehdr(elf, &ehdr) == NULL)
 567		goto out;
 568
 569	if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
 570		goto out;
 571
 572	*address = shdr.sh_addr - shdr.sh_offset;
 573	ret = 0;
 574out:
 575	elf_end(elf);
 576out_close:
 577	close(fd);
 578
 579	return ret;
 580}
 581
 582/*
 583 * Convert trace point to probe point with debuginfo
 584 */
 585static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
 586					    struct perf_probe_point *pp,
 587					    bool is_kprobe)
 588{
 589	struct debuginfo *dinfo = NULL;
 590	unsigned long stext = 0;
 591	u64 addr = tp->address;
 592	int ret = -ENOENT;
 593
 594	/* convert the address to dwarf address */
 595	if (!is_kprobe) {
 596		if (!addr) {
 597			ret = -EINVAL;
 598			goto error;
 599		}
 600		ret = get_text_start_address(tp->module, &stext, NULL);
 601		if (ret < 0)
 602			goto error;
 603		addr += stext;
 604	} else if (tp->symbol) {
 605		/* If the module is given, this returns relative address */
 606		ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
 607							false, !!tp->module);
 608		if (ret != 0)
 609			goto error;
 610		addr += tp->offset;
 611	}
 612
 613	pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
 614		 tp->module ? : "kernel");
 615
 616	dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
 617	if (dinfo)
 618		ret = debuginfo__find_probe_point(dinfo,
 619						 (unsigned long)addr, pp);
 620	else
 621		ret = -ENOENT;
 622
 623	if (ret > 0) {
 624		pp->retprobe = tp->retprobe;
 625		return 0;
 626	}
 627error:
 628	pr_debug("Failed to find corresponding probes from debuginfo.\n");
 629	return ret ? : -ENOENT;
 630}
 631
 632/* Adjust symbol name and address */
 633static int post_process_probe_trace_point(struct probe_trace_point *tp,
 634					   struct map *map, unsigned long offs)
 635{
 636	struct symbol *sym;
 637	u64 addr = tp->address - offs;
 638
 639	sym = map__find_symbol(map, addr);
 640	if (!sym)
 641		return -ENOENT;
 642
 643	if (strcmp(sym->name, tp->symbol)) {
 644		/* If we have no realname, use symbol for it */
 645		if (!tp->realname)
 646			tp->realname = tp->symbol;
 647		else
 648			free(tp->symbol);
 649		tp->symbol = strdup(sym->name);
 650		if (!tp->symbol)
 651			return -ENOMEM;
 652	}
 653	tp->offset = addr - sym->start;
 654	tp->address -= offs;
 655
 656	return 0;
 657}
 658
 659/*
 660 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
 661 * and generate new symbols with suffixes such as .constprop.N or .isra.N
 662 * etc. Since those symbols are not recorded in DWARF, we have to find
 663 * correct generated symbols from offline ELF binary.
 664 * For online kernel or uprobes we don't need this because those are
 665 * rebased on _text, or already a section relative address.
 666 */
 667static int
 668post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
 669					int ntevs, const char *pathname)
 670{
 671	struct map *map;
 672	unsigned long stext = 0;
 673	int i, ret = 0;
 674
 675	/* Prepare a map for offline binary */
 676	map = dso__new_map(pathname);
 677	if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
 678		pr_warning("Failed to get ELF symbols for %s\n", pathname);
 679		return -EINVAL;
 680	}
 681
 682	for (i = 0; i < ntevs; i++) {
 683		ret = post_process_probe_trace_point(&tevs[i].point,
 684						     map, stext);
 685		if (ret < 0)
 686			break;
 687	}
 688	map__put(map);
 689
 690	return ret;
 691}
 692
 693static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
 694					  int ntevs, const char *exec,
 695					  struct nsinfo *nsi)
 696{
 697	int i, ret = 0;
 698	unsigned long stext = 0;
 699
 700	if (!exec)
 701		return 0;
 702
 703	ret = get_text_start_address(exec, &stext, nsi);
 704	if (ret < 0)
 705		return ret;
 706
 707	for (i = 0; i < ntevs && ret >= 0; i++) {
 708		/* point.address is the addres of point.symbol + point.offset */
 709		tevs[i].point.address -= stext;
 710		tevs[i].point.module = strdup(exec);
 711		if (!tevs[i].point.module) {
 712			ret = -ENOMEM;
 713			break;
 714		}
 715		tevs[i].uprobes = true;
 716	}
 717
 718	return ret;
 719}
 720
 721static int
 722post_process_module_probe_trace_events(struct probe_trace_event *tevs,
 723				       int ntevs, const char *module,
 724				       struct debuginfo *dinfo)
 725{
 726	Dwarf_Addr text_offs = 0;
 727	int i, ret = 0;
 728	char *mod_name = NULL;
 729	struct map *map;
 730
 731	if (!module)
 732		return 0;
 733
 734	map = get_target_map(module, NULL, false);
 735	if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
 736		pr_warning("Failed to get ELF symbols for %s\n", module);
 737		return -EINVAL;
 
 
 
 
 
 
 738	}
 739
 740	mod_name = find_module_name(module);
 741	for (i = 0; i < ntevs; i++) {
 742		ret = post_process_probe_trace_point(&tevs[i].point,
 743						map, (unsigned long)text_offs);
 744		if (ret < 0)
 745			break;
 746		tevs[i].point.module =
 747			strdup(mod_name ? mod_name : module);
 748		if (!tevs[i].point.module) {
 749			ret = -ENOMEM;
 750			break;
 751		}
 752	}
 753
 754	free(mod_name);
 755	map__put(map);
 756
 757	return ret;
 758}
 759
 760static int
 761post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
 762				       int ntevs)
 
 763{
 764	struct ref_reloc_sym *reloc_sym;
 765	char *tmp;
 766	int i, skipped = 0;
 767
 768	/* Skip post process if the target is an offline kernel */
 769	if (symbol_conf.ignore_vmlinux_buildid)
 770		return post_process_offline_probe_trace_events(tevs, ntevs,
 771						symbol_conf.vmlinux_name);
 
 
 772
 773	reloc_sym = kernel_get_ref_reloc_sym();
 774	if (!reloc_sym) {
 775		pr_warning("Relocated base symbol is not found!\n");
 776		return -EINVAL;
 777	}
 778
 779	for (i = 0; i < ntevs; i++) {
 780		if (!tevs[i].point.address)
 781			continue;
 782		if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
 783			continue;
 784		/* If we found a wrong one, mark it by NULL symbol */
 785		if (kprobe_warn_out_range(tevs[i].point.symbol,
 786					  tevs[i].point.address)) {
 787			tmp = NULL;
 788			skipped++;
 789		} else {
 790			tmp = strdup(reloc_sym->name);
 791			if (!tmp)
 792				return -ENOMEM;
 793		}
 794		/* If we have no realname, use symbol for it */
 795		if (!tevs[i].point.realname)
 796			tevs[i].point.realname = tevs[i].point.symbol;
 797		else
 798			free(tevs[i].point.symbol);
 799		tevs[i].point.symbol = tmp;
 800		tevs[i].point.offset = tevs[i].point.address -
 801				       reloc_sym->unrelocated_addr;
 802	}
 803	return skipped;
 804}
 805
 806void __weak
 807arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
 808				      int ntevs __maybe_unused)
 809{
 810}
 811
 812/* Post processing the probe events */
 813static int post_process_probe_trace_events(struct perf_probe_event *pev,
 814					   struct probe_trace_event *tevs,
 815					   int ntevs, const char *module,
 816					   bool uprobe, struct debuginfo *dinfo)
 817{
 818	int ret;
 819
 820	if (uprobe)
 821		ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
 822						     pev->nsi);
 823	else if (module)
 824		/* Currently ref_reloc_sym based probe is not for drivers */
 825		ret = post_process_module_probe_trace_events(tevs, ntevs,
 826							     module, dinfo);
 827	else
 828		ret = post_process_kernel_probe_trace_events(tevs, ntevs);
 829
 830	if (ret >= 0)
 831		arch__post_process_probe_trace_events(pev, ntevs);
 832
 833	return ret;
 834}
 835
 836/* Try to find perf_probe_event with debuginfo */
 837static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 838					  struct probe_trace_event **tevs)
 839{
 840	bool need_dwarf = perf_probe_event_need_dwarf(pev);
 841	struct perf_probe_point tmp;
 842	struct debuginfo *dinfo;
 843	int ntevs, ret = 0;
 844
 845	dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
 846	if (!dinfo) {
 847		if (need_dwarf)
 848			return -ENOENT;
 849		pr_debug("Could not open debuginfo. Try to use symbols.\n");
 850		return 0;
 851	}
 852
 853	pr_debug("Try to find probe point from debuginfo.\n");
 854	/* Searching trace events corresponding to a probe event */
 855	ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
 856
 857	if (ntevs == 0)	{  /* Not found, retry with an alternative */
 858		ret = get_alternative_probe_event(dinfo, pev, &tmp);
 859		if (!ret) {
 860			ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
 861			/*
 862			 * Write back to the original probe_event for
 863			 * setting appropriate (user given) event name
 864			 */
 865			clear_perf_probe_point(&pev->point);
 866			memcpy(&pev->point, &tmp, sizeof(tmp));
 867		}
 868	}
 869
 
 
 870	if (ntevs > 0) {	/* Succeeded to find trace events */
 871		pr_debug("Found %d probe_trace_events.\n", ntevs);
 872		ret = post_process_probe_trace_events(pev, *tevs, ntevs,
 873					pev->target, pev->uprobes, dinfo);
 874		if (ret < 0 || ret == ntevs) {
 875			pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
 876			clear_probe_trace_events(*tevs, ntevs);
 877			zfree(tevs);
 878			ntevs = 0;
 879		}
 
 
 
 
 880	}
 881
 882	debuginfo__delete(dinfo);
 883
 884	if (ntevs == 0)	{	/* No error but failed to find probe point. */
 885		pr_warning("Probe point '%s' not found.\n",
 886			   synthesize_perf_probe_point(&pev->point));
 887		return -ENOENT;
 888	} else if (ntevs < 0) {
 889		/* Error path : ntevs < 0 */
 890		pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
 
 891		if (ntevs == -EBADF)
 892			pr_warning("Warning: No dwarf info found in the vmlinux - "
 893				"please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
 894		if (!need_dwarf) {
 895			pr_debug("Trying to use symbols.\n");
 896			return 0;
 897		}
 898	}
 899	return ntevs;
 900}
 901
 902#define LINEBUF_SIZE 256
 903#define NR_ADDITIONAL_LINES 2
 904
 905static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
 906{
 907	char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
 908	const char *color = show_num ? "" : PERF_COLOR_BLUE;
 909	const char *prefix = NULL;
 910
 911	do {
 912		if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 913			goto error;
 914		if (skip)
 915			continue;
 916		if (!prefix) {
 917			prefix = show_num ? "%7d  " : "         ";
 918			color_fprintf(stdout, color, prefix, l);
 919		}
 920		color_fprintf(stdout, color, "%s", buf);
 921
 922	} while (strchr(buf, '\n') == NULL);
 923
 924	return 1;
 925error:
 926	if (ferror(fp)) {
 927		pr_warning("File read error: %s\n",
 928			   str_error_r(errno, sbuf, sizeof(sbuf)));
 929		return -1;
 930	}
 931	return 0;
 932}
 933
 934static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
 935{
 936	int rv = __show_one_line(fp, l, skip, show_num);
 937	if (rv == 0) {
 938		pr_warning("Source file is shorter than expected.\n");
 939		rv = -1;
 940	}
 941	return rv;
 942}
 943
 944#define show_one_line_with_num(f,l)	_show_one_line(f,l,false,true)
 945#define show_one_line(f,l)		_show_one_line(f,l,false,false)
 946#define skip_one_line(f,l)		_show_one_line(f,l,true,false)
 947#define show_one_line_or_eof(f,l)	__show_one_line(f,l,false,false)
 948
 949/*
 950 * Show line-range always requires debuginfo to find source file and
 951 * line number.
 952 */
 953static int __show_line_range(struct line_range *lr, const char *module,
 954			     bool user)
 955{
 956	int l = 1;
 957	struct int_node *ln;
 958	struct debuginfo *dinfo;
 959	FILE *fp;
 960	int ret;
 961	char *tmp;
 962	char sbuf[STRERR_BUFSIZE];
 963
 964	/* Search a line range */
 965	dinfo = open_debuginfo(module, NULL, false);
 966	if (!dinfo)
 967		return -ENOENT;
 968
 969	ret = debuginfo__find_line_range(dinfo, lr);
 970	if (!ret) {	/* Not found, retry with an alternative */
 971		ret = get_alternative_line_range(dinfo, lr, module, user);
 972		if (!ret)
 973			ret = debuginfo__find_line_range(dinfo, lr);
 974	}
 975	debuginfo__delete(dinfo);
 976	if (ret == 0 || ret == -ENOENT) {
 977		pr_warning("Specified source line is not found.\n");
 978		return -ENOENT;
 979	} else if (ret < 0) {
 980		pr_warning("Debuginfo analysis failed.\n");
 981		return ret;
 982	}
 983
 984	/* Convert source file path */
 985	tmp = lr->path;
 986	ret = get_real_path(tmp, lr->comp_dir, &lr->path);
 987
 988	/* Free old path when new path is assigned */
 989	if (tmp != lr->path)
 990		free(tmp);
 991
 992	if (ret < 0) {
 993		pr_warning("Failed to find source file path.\n");
 994		return ret;
 995	}
 996
 997	setup_pager();
 998
 999	if (lr->function)
1000		fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
1001			lr->start - lr->offset);
1002	else
1003		fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
1004
1005	fp = fopen(lr->path, "r");
1006	if (fp == NULL) {
1007		pr_warning("Failed to open %s: %s\n", lr->path,
1008			   str_error_r(errno, sbuf, sizeof(sbuf)));
1009		return -errno;
1010	}
1011	/* Skip to starting line number */
1012	while (l < lr->start) {
1013		ret = skip_one_line(fp, l++);
1014		if (ret < 0)
1015			goto end;
1016	}
1017
1018	intlist__for_each_entry(ln, lr->line_list) {
1019		for (; ln->i > l; l++) {
1020			ret = show_one_line(fp, l - lr->offset);
1021			if (ret < 0)
1022				goto end;
1023		}
1024		ret = show_one_line_with_num(fp, l++ - lr->offset);
1025		if (ret < 0)
1026			goto end;
1027	}
1028
1029	if (lr->end == INT_MAX)
1030		lr->end = l + NR_ADDITIONAL_LINES;
1031	while (l <= lr->end) {
1032		ret = show_one_line_or_eof(fp, l++ - lr->offset);
1033		if (ret <= 0)
1034			break;
1035	}
1036end:
1037	fclose(fp);
1038	return ret;
1039}
1040
1041int show_line_range(struct line_range *lr, const char *module,
1042		    struct nsinfo *nsi, bool user)
1043{
1044	int ret;
1045	struct nscookie nsc;
1046
1047	ret = init_probe_symbol_maps(user);
1048	if (ret < 0)
1049		return ret;
1050	nsinfo__mountns_enter(nsi, &nsc);
1051	ret = __show_line_range(lr, module, user);
1052	nsinfo__mountns_exit(&nsc);
1053	exit_probe_symbol_maps();
1054
1055	return ret;
1056}
1057
1058static int show_available_vars_at(struct debuginfo *dinfo,
1059				  struct perf_probe_event *pev,
1060				  struct strfilter *_filter)
1061{
1062	char *buf;
1063	int ret, i, nvars;
1064	struct str_node *node;
1065	struct variable_list *vls = NULL, *vl;
1066	struct perf_probe_point tmp;
1067	const char *var;
1068
1069	buf = synthesize_perf_probe_point(&pev->point);
1070	if (!buf)
1071		return -EINVAL;
1072	pr_debug("Searching variables at %s\n", buf);
1073
1074	ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1075	if (!ret) {  /* Not found, retry with an alternative */
1076		ret = get_alternative_probe_event(dinfo, pev, &tmp);
1077		if (!ret) {
1078			ret = debuginfo__find_available_vars_at(dinfo, pev,
1079								&vls);
1080			/* Release the old probe_point */
1081			clear_perf_probe_point(&tmp);
1082		}
1083	}
1084	if (ret <= 0) {
1085		if (ret == 0 || ret == -ENOENT) {
1086			pr_err("Failed to find the address of %s\n", buf);
1087			ret = -ENOENT;
1088		} else
1089			pr_warning("Debuginfo analysis failed.\n");
1090		goto end;
1091	}
1092
1093	/* Some variables are found */
1094	fprintf(stdout, "Available variables at %s\n", buf);
1095	for (i = 0; i < ret; i++) {
1096		vl = &vls[i];
1097		/*
1098		 * A probe point might be converted to
1099		 * several trace points.
1100		 */
1101		fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1102			vl->point.offset);
1103		zfree(&vl->point.symbol);
1104		nvars = 0;
1105		if (vl->vars) {
1106			strlist__for_each_entry(node, vl->vars) {
1107				var = strchr(node->s, '\t') + 1;
1108				if (strfilter__compare(_filter, var)) {
1109					fprintf(stdout, "\t\t%s\n", node->s);
1110					nvars++;
1111				}
1112			}
1113			strlist__delete(vl->vars);
1114		}
1115		if (nvars == 0)
1116			fprintf(stdout, "\t\t(No matched variables)\n");
1117	}
1118	free(vls);
1119end:
1120	free(buf);
1121	return ret;
1122}
1123
1124/* Show available variables on given probe point */
1125int show_available_vars(struct perf_probe_event *pevs, int npevs,
1126			struct strfilter *_filter)
1127{
1128	int i, ret = 0;
1129	struct debuginfo *dinfo;
1130
1131	ret = init_probe_symbol_maps(pevs->uprobes);
1132	if (ret < 0)
1133		return ret;
1134
1135	dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1136	if (!dinfo) {
1137		ret = -ENOENT;
1138		goto out;
1139	}
1140
1141	setup_pager();
1142
1143	for (i = 0; i < npevs && ret >= 0; i++)
1144		ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1145
1146	debuginfo__delete(dinfo);
1147out:
1148	exit_probe_symbol_maps();
1149	return ret;
1150}
1151
1152#else	/* !HAVE_DWARF_SUPPORT */
1153
1154static void debuginfo_cache__exit(void)
1155{
1156}
1157
1158static int
1159find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1160				 struct perf_probe_point *pp __maybe_unused,
1161				 bool is_kprobe __maybe_unused)
1162{
1163	return -ENOSYS;
1164}
1165
1166static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1167				struct probe_trace_event **tevs __maybe_unused)
1168{
1169	if (perf_probe_event_need_dwarf(pev)) {
1170		pr_warning("Debuginfo-analysis is not supported.\n");
1171		return -ENOSYS;
1172	}
1173
1174	return 0;
1175}
1176
1177int show_line_range(struct line_range *lr __maybe_unused,
1178		    const char *module __maybe_unused,
1179		    struct nsinfo *nsi __maybe_unused,
1180		    bool user __maybe_unused)
1181{
1182	pr_warning("Debuginfo-analysis is not supported.\n");
1183	return -ENOSYS;
1184}
1185
1186int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1187			int npevs __maybe_unused,
1188			struct strfilter *filter __maybe_unused)
1189{
1190	pr_warning("Debuginfo-analysis is not supported.\n");
1191	return -ENOSYS;
1192}
1193#endif
1194
1195void line_range__clear(struct line_range *lr)
1196{
1197	free(lr->function);
1198	free(lr->file);
1199	free(lr->path);
1200	free(lr->comp_dir);
1201	intlist__delete(lr->line_list);
1202	memset(lr, 0, sizeof(*lr));
1203}
1204
1205int line_range__init(struct line_range *lr)
1206{
1207	memset(lr, 0, sizeof(*lr));
1208	lr->line_list = intlist__new(NULL);
1209	if (!lr->line_list)
1210		return -ENOMEM;
1211	else
1212		return 0;
1213}
1214
1215static int parse_line_num(char **ptr, int *val, const char *what)
1216{
1217	const char *start = *ptr;
1218
1219	errno = 0;
1220	*val = strtol(*ptr, ptr, 0);
1221	if (errno || *ptr == start) {
1222		semantic_error("'%s' is not a valid number.\n", what);
1223		return -EINVAL;
1224	}
1225	return 0;
1226}
1227
1228/* Check the name is good for event, group or function */
1229static bool is_c_func_name(const char *name)
1230{
1231	if (!isalpha(*name) && *name != '_')
1232		return false;
1233	while (*++name != '\0') {
1234		if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1235			return false;
1236	}
1237	return true;
1238}
1239
1240/*
1241 * Stuff 'lr' according to the line range described by 'arg'.
1242 * The line range syntax is described by:
1243 *
1244 *         SRC[:SLN[+NUM|-ELN]]
1245 *         FNC[@SRC][:SLN[+NUM|-ELN]]
1246 */
1247int parse_line_range_desc(const char *arg, struct line_range *lr)
1248{
1249	char *range, *file, *name = strdup(arg);
1250	int err;
1251
1252	if (!name)
1253		return -ENOMEM;
1254
1255	lr->start = 0;
1256	lr->end = INT_MAX;
1257
1258	range = strchr(name, ':');
1259	if (range) {
1260		*range++ = '\0';
1261
1262		err = parse_line_num(&range, &lr->start, "start line");
1263		if (err)
1264			goto err;
1265
1266		if (*range == '+' || *range == '-') {
1267			const char c = *range++;
1268
1269			err = parse_line_num(&range, &lr->end, "end line");
1270			if (err)
1271				goto err;
1272
1273			if (c == '+') {
1274				lr->end += lr->start;
1275				/*
1276				 * Adjust the number of lines here.
1277				 * If the number of lines == 1, the
1278				 * the end of line should be equal to
1279				 * the start of line.
1280				 */
1281				lr->end--;
1282			}
1283		}
1284
1285		pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1286
1287		err = -EINVAL;
1288		if (lr->start > lr->end) {
1289			semantic_error("Start line must be smaller"
1290				       " than end line.\n");
1291			goto err;
1292		}
1293		if (*range != '\0') {
1294			semantic_error("Tailing with invalid str '%s'.\n", range);
1295			goto err;
1296		}
1297	}
1298
1299	file = strchr(name, '@');
1300	if (file) {
1301		*file = '\0';
1302		lr->file = strdup(++file);
1303		if (lr->file == NULL) {
1304			err = -ENOMEM;
1305			goto err;
1306		}
1307		lr->function = name;
1308	} else if (strchr(name, '/') || strchr(name, '.'))
1309		lr->file = name;
1310	else if (is_c_func_name(name))/* We reuse it for checking funcname */
1311		lr->function = name;
1312	else {	/* Invalid name */
1313		semantic_error("'%s' is not a valid function name.\n", name);
1314		err = -EINVAL;
1315		goto err;
1316	}
1317
1318	return 0;
1319err:
1320	free(name);
1321	return err;
1322}
1323
1324static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1325{
1326	char *ptr;
1327
1328	ptr = strpbrk_esc(*arg, ":");
1329	if (ptr) {
1330		*ptr = '\0';
1331		if (!pev->sdt && !is_c_func_name(*arg))
1332			goto ng_name;
1333		pev->group = strdup_esc(*arg);
1334		if (!pev->group)
1335			return -ENOMEM;
1336		*arg = ptr + 1;
1337	} else
1338		pev->group = NULL;
1339
1340	pev->event = strdup_esc(*arg);
1341	if (pev->event == NULL)
1342		return -ENOMEM;
1343
1344	if (!pev->sdt && !is_c_func_name(pev->event)) {
1345		zfree(&pev->event);
1346ng_name:
1347		zfree(&pev->group);
1348		semantic_error("%s is bad for event name -it must "
1349			       "follow C symbol-naming rule.\n", *arg);
1350		return -EINVAL;
1351	}
1352	return 0;
1353}
1354
1355/* Parse probepoint definition. */
1356static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1357{
1358	struct perf_probe_point *pp = &pev->point;
1359	char *ptr, *tmp;
1360	char c, nc = 0;
1361	bool file_spec = false;
1362	int ret;
1363
1364	/*
1365	 * <Syntax>
1366	 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1367	 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1368	 * perf probe %[GRP:]SDT_EVENT
 
1369	 */
1370	if (!arg)
1371		return -EINVAL;
1372
1373	if (is_sdt_event(arg)) {
1374		pev->sdt = true;
1375		if (arg[0] == '%')
1376			arg++;
1377	}
1378
1379	ptr = strpbrk_esc(arg, ";=@+%");
1380	if (pev->sdt) {
1381		if (ptr) {
1382			if (*ptr != '@') {
1383				semantic_error("%s must be an SDT name.\n",
1384					       arg);
1385				return -EINVAL;
1386			}
1387			/* This must be a target file name or build id */
1388			tmp = build_id_cache__complement(ptr + 1);
1389			if (tmp) {
1390				pev->target = build_id_cache__origname(tmp);
1391				free(tmp);
1392			} else
1393				pev->target = strdup_esc(ptr + 1);
1394			if (!pev->target)
1395				return -ENOMEM;
1396			*ptr = '\0';
1397		}
1398		ret = parse_perf_probe_event_name(&arg, pev);
1399		if (ret == 0) {
1400			if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1401				ret = -errno;
1402		}
1403		return ret;
1404	}
1405
1406	if (ptr && *ptr == '=') {	/* Event name */
1407		*ptr = '\0';
1408		tmp = ptr + 1;
1409		ret = parse_perf_probe_event_name(&arg, pev);
1410		if (ret < 0)
1411			return ret;
1412
 
 
 
 
 
 
 
 
 
1413		arg = tmp;
1414	}
1415
1416	/*
1417	 * Check arg is function or file name and copy it.
1418	 *
1419	 * We consider arg to be a file spec if and only if it satisfies
1420	 * all of the below criteria::
1421	 * - it does not include any of "+@%",
1422	 * - it includes one of ":;", and
1423	 * - it has a period '.' in the name.
1424	 *
1425	 * Otherwise, we consider arg to be a function specification.
1426	 */
1427	if (!strpbrk_esc(arg, "+@%")) {
1428		ptr = strpbrk_esc(arg, ";:");
1429		/* This is a file spec if it includes a '.' before ; or : */
1430		if (ptr && memchr(arg, '.', ptr - arg))
1431			file_spec = true;
1432	}
1433
1434	ptr = strpbrk_esc(arg, ";:+@%");
1435	if (ptr) {
1436		nc = *ptr;
1437		*ptr++ = '\0';
1438	}
1439
1440	if (arg[0] == '\0')
1441		tmp = NULL;
1442	else {
1443		tmp = strdup_esc(arg);
1444		if (tmp == NULL)
1445			return -ENOMEM;
1446	}
1447
1448	if (file_spec)
1449		pp->file = tmp;
1450	else {
1451		pp->function = tmp;
1452
1453		/*
1454		 * Keep pp->function even if this is absolute address,
1455		 * so it can mark whether abs_address is valid.
1456		 * Which make 'perf probe lib.bin 0x0' possible.
1457		 *
1458		 * Note that checking length of tmp is not needed
1459		 * because when we access tmp[1] we know tmp[0] is '0',
1460		 * so tmp[1] should always valid (but could be '\0').
1461		 */
1462		if (tmp && !strncmp(tmp, "0x", 2)) {
1463			pp->abs_address = strtoul(pp->function, &tmp, 0);
1464			if (*tmp != '\0') {
1465				semantic_error("Invalid absolute address.\n");
1466				return -EINVAL;
1467			}
1468		}
1469	}
1470
1471	/* Parse other options */
1472	while (ptr) {
1473		arg = ptr;
1474		c = nc;
1475		if (c == ';') {	/* Lazy pattern must be the last part */
1476			pp->lazy_line = strdup(arg); /* let leave escapes */
1477			if (pp->lazy_line == NULL)
1478				return -ENOMEM;
1479			break;
1480		}
1481		ptr = strpbrk_esc(arg, ";:+@%");
1482		if (ptr) {
1483			nc = *ptr;
1484			*ptr++ = '\0';
1485		}
1486		switch (c) {
1487		case ':':	/* Line number */
1488			pp->line = strtoul(arg, &tmp, 0);
1489			if (*tmp != '\0') {
1490				semantic_error("There is non-digit char"
1491					       " in line number.\n");
1492				return -EINVAL;
1493			}
1494			break;
1495		case '+':	/* Byte offset from a symbol */
1496			pp->offset = strtoul(arg, &tmp, 0);
1497			if (*tmp != '\0') {
1498				semantic_error("There is non-digit character"
1499						" in offset.\n");
1500				return -EINVAL;
1501			}
1502			break;
1503		case '@':	/* File name */
1504			if (pp->file) {
1505				semantic_error("SRC@SRC is not allowed.\n");
1506				return -EINVAL;
1507			}
1508			pp->file = strdup_esc(arg);
1509			if (pp->file == NULL)
1510				return -ENOMEM;
1511			break;
1512		case '%':	/* Probe places */
1513			if (strcmp(arg, "return") == 0) {
1514				pp->retprobe = 1;
1515			} else {	/* Others not supported yet */
1516				semantic_error("%%%s is not supported.\n", arg);
1517				return -ENOTSUP;
1518			}
1519			break;
1520		default:	/* Buggy case */
1521			pr_err("This program has a bug at %s:%d.\n",
1522				__FILE__, __LINE__);
1523			return -ENOTSUP;
1524			break;
1525		}
1526	}
1527
1528	/* Exclusion check */
1529	if (pp->lazy_line && pp->line) {
1530		semantic_error("Lazy pattern can't be used with"
1531			       " line number.\n");
1532		return -EINVAL;
1533	}
1534
1535	if (pp->lazy_line && pp->offset) {
1536		semantic_error("Lazy pattern can't be used with offset.\n");
1537		return -EINVAL;
1538	}
1539
1540	if (pp->line && pp->offset) {
1541		semantic_error("Offset can't be used with line number.\n");
1542		return -EINVAL;
1543	}
1544
1545	if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1546		semantic_error("File always requires line number or "
1547			       "lazy pattern.\n");
1548		return -EINVAL;
1549	}
1550
1551	if (pp->offset && !pp->function) {
1552		semantic_error("Offset requires an entry function.\n");
1553		return -EINVAL;
1554	}
1555
 
 
 
 
 
1556	if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1557		semantic_error("Offset/Line/Lazy pattern can't be used with "
1558			       "return probe.\n");
1559		return -EINVAL;
1560	}
1561
1562	pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1563		 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1564		 pp->lazy_line);
1565	return 0;
1566}
1567
1568/* Parse perf-probe event argument */
1569static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1570{
1571	char *tmp, *goodname;
1572	struct perf_probe_arg_field **fieldp;
1573
1574	pr_debug("parsing arg: %s into ", str);
1575
1576	tmp = strchr(str, '=');
1577	if (tmp) {
1578		arg->name = strndup(str, tmp - str);
1579		if (arg->name == NULL)
1580			return -ENOMEM;
1581		pr_debug("name:%s ", arg->name);
1582		str = tmp + 1;
1583	}
1584
1585	tmp = strchr(str, ':');
1586	if (tmp) {	/* Type setting */
1587		*tmp = '\0';
1588		arg->type = strdup(tmp + 1);
1589		if (arg->type == NULL)
1590			return -ENOMEM;
1591		pr_debug("type:%s ", arg->type);
1592	}
1593
1594	tmp = strpbrk(str, "-.[");
1595	if (!is_c_varname(str) || !tmp) {
1596		/* A variable, register, symbol or special value */
1597		arg->var = strdup(str);
1598		if (arg->var == NULL)
1599			return -ENOMEM;
1600		pr_debug("%s\n", arg->var);
1601		return 0;
1602	}
1603
1604	/* Structure fields or array element */
1605	arg->var = strndup(str, tmp - str);
1606	if (arg->var == NULL)
1607		return -ENOMEM;
1608	goodname = arg->var;
1609	pr_debug("%s, ", arg->var);
1610	fieldp = &arg->field;
1611
1612	do {
1613		*fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1614		if (*fieldp == NULL)
1615			return -ENOMEM;
1616		if (*tmp == '[') {	/* Array */
1617			str = tmp;
1618			(*fieldp)->index = strtol(str + 1, &tmp, 0);
1619			(*fieldp)->ref = true;
1620			if (*tmp != ']' || tmp == str + 1) {
1621				semantic_error("Array index must be a"
1622						" number.\n");
1623				return -EINVAL;
1624			}
1625			tmp++;
1626			if (*tmp == '\0')
1627				tmp = NULL;
1628		} else {		/* Structure */
1629			if (*tmp == '.') {
1630				str = tmp + 1;
1631				(*fieldp)->ref = false;
1632			} else if (tmp[1] == '>') {
1633				str = tmp + 2;
1634				(*fieldp)->ref = true;
1635			} else {
1636				semantic_error("Argument parse error: %s\n",
1637					       str);
1638				return -EINVAL;
1639			}
1640			tmp = strpbrk(str, "-.[");
1641		}
1642		if (tmp) {
1643			(*fieldp)->name = strndup(str, tmp - str);
1644			if ((*fieldp)->name == NULL)
1645				return -ENOMEM;
1646			if (*str != '[')
1647				goodname = (*fieldp)->name;
1648			pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1649			fieldp = &(*fieldp)->next;
1650		}
1651	} while (tmp);
1652	(*fieldp)->name = strdup(str);
1653	if ((*fieldp)->name == NULL)
1654		return -ENOMEM;
1655	if (*str != '[')
1656		goodname = (*fieldp)->name;
1657	pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1658
1659	/* If no name is specified, set the last field name (not array index)*/
1660	if (!arg->name) {
1661		arg->name = strdup(goodname);
1662		if (arg->name == NULL)
1663			return -ENOMEM;
1664	}
1665	return 0;
1666}
1667
1668/* Parse perf-probe event command */
1669int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1670{
1671	char **argv;
1672	int argc, i, ret = 0;
1673
1674	argv = argv_split(cmd, &argc);
1675	if (!argv) {
1676		pr_debug("Failed to split arguments.\n");
1677		return -ENOMEM;
1678	}
1679	if (argc - 1 > MAX_PROBE_ARGS) {
1680		semantic_error("Too many probe arguments (%d).\n", argc - 1);
1681		ret = -ERANGE;
1682		goto out;
1683	}
1684	/* Parse probe point */
1685	ret = parse_perf_probe_point(argv[0], pev);
1686	if (ret < 0)
1687		goto out;
1688
1689	/* Copy arguments and ensure return probe has no C argument */
1690	pev->nargs = argc - 1;
1691	pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1692	if (pev->args == NULL) {
1693		ret = -ENOMEM;
1694		goto out;
1695	}
1696	for (i = 0; i < pev->nargs && ret >= 0; i++) {
1697		ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1698		if (ret >= 0 &&
1699		    is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1700			semantic_error("You can't specify local variable for"
1701				       " kretprobe.\n");
1702			ret = -EINVAL;
1703		}
1704	}
1705out:
1706	argv_free(argv);
1707
1708	return ret;
1709}
1710
1711/* Returns true if *any* ARG is either C variable, $params or $vars. */
1712bool perf_probe_with_var(struct perf_probe_event *pev)
1713{
1714	int i = 0;
1715
1716	for (i = 0; i < pev->nargs; i++)
1717		if (is_c_varname(pev->args[i].var)              ||
1718		    !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1719		    !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1720			return true;
1721	return false;
1722}
1723
1724/* Return true if this perf_probe_event requires debuginfo */
1725bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1726{
 
 
1727	if (pev->point.file || pev->point.line || pev->point.lazy_line)
1728		return true;
1729
1730	if (perf_probe_with_var(pev))
1731		return true;
 
1732
1733	return false;
1734}
1735
1736/* Parse probe_events event into struct probe_point */
1737int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1738{
1739	struct probe_trace_point *tp = &tev->point;
1740	char pr;
1741	char *p;
1742	char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1743	int ret, i, argc;
1744	char **argv;
1745
1746	pr_debug("Parsing probe_events: %s\n", cmd);
1747	argv = argv_split(cmd, &argc);
1748	if (!argv) {
1749		pr_debug("Failed to split arguments.\n");
1750		return -ENOMEM;
1751	}
1752	if (argc < 2) {
1753		semantic_error("Too few probe arguments.\n");
1754		ret = -ERANGE;
1755		goto out;
1756	}
1757
1758	/* Scan event and group name. */
1759	argv0_str = strdup(argv[0]);
1760	if (argv0_str == NULL) {
1761		ret = -ENOMEM;
1762		goto out;
1763	}
1764	fmt1_str = strtok_r(argv0_str, ":", &fmt);
1765	fmt2_str = strtok_r(NULL, "/", &fmt);
1766	fmt3_str = strtok_r(NULL, " \t", &fmt);
1767	if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1768	    || fmt3_str == NULL) {
1769		semantic_error("Failed to parse event name: %s\n", argv[0]);
1770		ret = -EINVAL;
1771		goto out;
1772	}
1773	pr = fmt1_str[0];
1774	tev->group = strdup(fmt2_str);
1775	tev->event = strdup(fmt3_str);
1776	if (tev->group == NULL || tev->event == NULL) {
1777		ret = -ENOMEM;
1778		goto out;
1779	}
1780	pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1781
1782	tp->retprobe = (pr == 'r');
1783
1784	/* Scan module name(if there), function name and offset */
1785	p = strchr(argv[1], ':');
1786	if (p) {
1787		tp->module = strndup(argv[1], p - argv[1]);
1788		if (!tp->module) {
1789			ret = -ENOMEM;
1790			goto out;
1791		}
1792		tev->uprobes = (tp->module[0] == '/');
1793		p++;
1794	} else
1795		p = argv[1];
1796	fmt1_str = strtok_r(p, "+", &fmt);
1797	/* only the address started with 0x */
1798	if (fmt1_str[0] == '0')	{
1799		/*
1800		 * Fix a special case:
1801		 * if address == 0, kernel reports something like:
1802		 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x          (null) arg1=%ax
1803		 * Newer kernel may fix that, but we want to
1804		 * support old kernel also.
1805		 */
1806		if (strcmp(fmt1_str, "0x") == 0) {
1807			if (!argv[2] || strcmp(argv[2], "(null)")) {
1808				ret = -EINVAL;
1809				goto out;
1810			}
1811			tp->address = 0;
1812
1813			free(argv[2]);
1814			for (i = 2; argv[i + 1] != NULL; i++)
1815				argv[i] = argv[i + 1];
1816
1817			argv[i] = NULL;
1818			argc -= 1;
1819		} else
1820			tp->address = strtoul(fmt1_str, NULL, 0);
1821	} else {
1822		/* Only the symbol-based probe has offset */
1823		tp->symbol = strdup(fmt1_str);
1824		if (tp->symbol == NULL) {
1825			ret = -ENOMEM;
1826			goto out;
1827		}
1828		fmt2_str = strtok_r(NULL, "", &fmt);
1829		if (fmt2_str == NULL)
1830			tp->offset = 0;
1831		else
1832			tp->offset = strtoul(fmt2_str, NULL, 10);
1833	}
1834
1835	tev->nargs = argc - 2;
1836	tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1837	if (tev->args == NULL) {
1838		ret = -ENOMEM;
1839		goto out;
1840	}
1841	for (i = 0; i < tev->nargs; i++) {
1842		p = strchr(argv[i + 2], '=');
1843		if (p)	/* We don't need which register is assigned. */
1844			*p++ = '\0';
1845		else
1846			p = argv[i + 2];
1847		tev->args[i].name = strdup(argv[i + 2]);
1848		/* TODO: parse regs and offset */
1849		tev->args[i].value = strdup(p);
1850		if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1851			ret = -ENOMEM;
1852			goto out;
1853		}
1854	}
1855	ret = 0;
1856out:
1857	free(argv0_str);
1858	argv_free(argv);
1859	return ret;
1860}
1861
1862/* Compose only probe arg */
1863char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1864{
1865	struct perf_probe_arg_field *field = pa->field;
1866	struct strbuf buf;
1867	char *ret = NULL;
1868	int err;
1869
1870	if (strbuf_init(&buf, 64) < 0)
1871		return NULL;
1872
1873	if (pa->name && pa->var)
1874		err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1875	else
1876		err = strbuf_addstr(&buf, pa->name ?: pa->var);
1877	if (err)
1878		goto out;
 
 
1879
1880	while (field) {
1881		if (field->name[0] == '[')
1882			err = strbuf_addstr(&buf, field->name);
1883		else
1884			err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1885					  field->name);
 
 
 
 
1886		field = field->next;
1887		if (err)
1888			goto out;
1889	}
1890
1891	if (pa->type)
1892		if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1893			goto out;
 
 
 
 
1894
1895	ret = strbuf_detach(&buf, NULL);
1896out:
1897	strbuf_release(&buf);
1898	return ret;
1899}
1900
1901/* Compose only probe point (not argument) */
1902char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1903{
1904	struct strbuf buf;
1905	char *tmp, *ret = NULL;
1906	int len, err = 0;
1907
1908	if (strbuf_init(&buf, 64) < 0)
1909		return NULL;
1910
1911	if (pp->function) {
1912		if (strbuf_addstr(&buf, pp->function) < 0)
1913			goto out;
1914		if (pp->offset)
1915			err = strbuf_addf(&buf, "+%lu", pp->offset);
1916		else if (pp->line)
1917			err = strbuf_addf(&buf, ":%d", pp->line);
1918		else if (pp->retprobe)
1919			err = strbuf_addstr(&buf, "%return");
1920		if (err)
1921			goto out;
 
 
 
1922	}
1923	if (pp->file) {
1924		tmp = pp->file;
1925		len = strlen(tmp);
1926		if (len > 30) {
1927			tmp = strchr(pp->file + len - 30, '/');
1928			tmp = tmp ? tmp + 1 : pp->file + len - 30;
1929		}
1930		err = strbuf_addf(&buf, "@%s", tmp);
1931		if (!err && !pp->function && pp->line)
1932			err = strbuf_addf(&buf, ":%d", pp->line);
1933	}
1934	if (!err)
1935		ret = strbuf_detach(&buf, NULL);
1936out:
1937	strbuf_release(&buf);
1938	return ret;
 
 
 
 
 
 
 
 
 
 
1939}
1940
 
1941char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1942{
1943	struct strbuf buf;
1944	char *tmp, *ret = NULL;
1945	int i;
1946
1947	if (strbuf_init(&buf, 64))
 
1948		return NULL;
1949	if (pev->event)
1950		if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1951				pev->event) < 0)
1952			goto out;
1953
1954	tmp = synthesize_perf_probe_point(&pev->point);
1955	if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1956		goto out;
1957	free(tmp);
1958
 
1959	for (i = 0; i < pev->nargs; i++) {
1960		tmp = synthesize_perf_probe_arg(pev->args + i);
1961		if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1962			goto out;
1963		free(tmp);
 
 
 
1964	}
1965
1966	ret = strbuf_detach(&buf, NULL);
1967out:
1968	strbuf_release(&buf);
1969	return ret;
1970}
 
1971
1972static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1973					    struct strbuf *buf, int depth)
 
1974{
1975	int err;
1976	if (ref->next) {
1977		depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1978							 depth + 1);
1979		if (depth < 0)
1980			return depth;
1981	}
1982	err = strbuf_addf(buf, "%+ld(", ref->offset);
1983	return (err < 0) ? err : depth;
 
 
 
 
 
 
 
 
 
1984}
1985
1986static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1987				      struct strbuf *buf)
1988{
1989	struct probe_trace_arg_ref *ref = arg->ref;
1990	int depth = 0, err;
 
1991
1992	/* Argument name or separator */
1993	if (arg->name)
1994		err = strbuf_addf(buf, " %s=", arg->name);
1995	else
1996		err = strbuf_addch(buf, ' ');
1997	if (err)
1998		return err;
 
 
1999
2000	/* Special case: @XXX */
2001	if (arg->value[0] == '@' && arg->ref)
2002			ref = ref->next;
2003
2004	/* Dereferencing arguments */
2005	if (ref) {
2006		depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
 
2007		if (depth < 0)
2008			return depth;
2009	}
2010
2011	/* Print argument value */
2012	if (arg->value[0] == '@' && arg->ref)
2013		err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
 
2014	else
2015		err = strbuf_addstr(buf, arg->value);
 
 
 
 
2016
2017	/* Closing */
2018	while (!err && depth--)
2019		err = strbuf_addch(buf, ')');
2020
 
 
 
 
2021	/* Print argument type */
2022	if (!err && arg->type)
2023		err = strbuf_addf(buf, ":%s", arg->type);
 
 
 
 
2024
2025	return err;
2026}
2027
2028char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2029{
2030	struct probe_trace_point *tp = &tev->point;
2031	struct strbuf buf;
2032	char *ret = NULL;
2033	int i, err;
2034
2035	/* Uprobes must have tp->module */
2036	if (tev->uprobes && !tp->module)
2037		return NULL;
2038
2039	if (strbuf_init(&buf, 32) < 0)
2040		return NULL;
 
 
2041
2042	if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2043			tev->group, tev->event) < 0)
2044		goto error;
2045	/*
2046	 * If tp->address == 0, then this point must be a
2047	 * absolute address uprobe.
2048	 * try_to_find_absolute_address() should have made
2049	 * tp->symbol to "0x0".
2050	 */
2051	if (tev->uprobes && !tp->address) {
2052		if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2053			goto error;
2054	}
2055
2056	/* Use the tp->address for uprobes */
2057	if (tev->uprobes)
2058		err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
 
2059	else if (!strncmp(tp->symbol, "0x", 2))
2060		/* Absolute address. See try_to_find_absolute_address() */
2061		err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2062				  tp->module ? ":" : "", tp->address);
 
2063	else
2064		err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2065				tp->module ? ":" : "", tp->symbol, tp->offset);
2066	if (err)
 
 
2067		goto error;
 
2068
2069	for (i = 0; i < tev->nargs; i++)
2070		if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
 
 
2071			goto error;
 
 
2072
2073	ret = strbuf_detach(&buf, NULL);
2074error:
2075	strbuf_release(&buf);
2076	return ret;
2077}
2078
2079static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2080					  struct perf_probe_point *pp,
2081					  bool is_kprobe)
2082{
2083	struct symbol *sym = NULL;
2084	struct map *map = NULL;
2085	u64 addr = tp->address;
2086	int ret = -ENOENT;
2087
2088	if (!is_kprobe) {
2089		map = dso__new_map(tp->module);
2090		if (!map)
2091			goto out;
2092		sym = map__find_symbol(map, addr);
2093	} else {
2094		if (tp->symbol && !addr) {
2095			if (kernel_get_symbol_address_by_name(tp->symbol,
2096						&addr, true, false) < 0)
2097				goto out;
2098		}
2099		if (addr) {
2100			addr += tp->offset;
2101			sym = __find_kernel_function(addr, &map);
2102		}
2103	}
2104
2105	if (!sym)
2106		goto out;
2107
2108	pp->retprobe = tp->retprobe;
2109	pp->offset = addr - map->unmap_ip(map, sym->start);
2110	pp->function = strdup(sym->name);
2111	ret = pp->function ? 0 : -ENOMEM;
2112
2113out:
2114	if (map && !is_kprobe) {
2115		map__put(map);
2116	}
2117
2118	return ret;
2119}
2120
2121static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2122				       struct perf_probe_point *pp,
2123				       bool is_kprobe)
2124{
2125	char buf[128];
2126	int ret;
2127
2128	ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2129	if (!ret)
2130		return 0;
2131	ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2132	if (!ret)
2133		return 0;
2134
2135	pr_debug("Failed to find probe point from both of dwarf and map.\n");
2136
2137	if (tp->symbol) {
2138		pp->function = strdup(tp->symbol);
2139		pp->offset = tp->offset;
2140	} else {
2141		ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2142		if (ret < 0)
2143			return ret;
2144		pp->function = strdup(buf);
2145		pp->offset = 0;
2146	}
2147	if (pp->function == NULL)
2148		return -ENOMEM;
2149
2150	pp->retprobe = tp->retprobe;
2151
2152	return 0;
2153}
2154
2155static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2156			       struct perf_probe_event *pev, bool is_kprobe)
2157{
2158	struct strbuf buf = STRBUF_INIT;
2159	int i, ret;
2160
2161	/* Convert event/group name */
2162	pev->event = strdup(tev->event);
2163	pev->group = strdup(tev->group);
2164	if (pev->event == NULL || pev->group == NULL)
2165		return -ENOMEM;
2166
2167	/* Convert trace_point to probe_point */
2168	ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2169	if (ret < 0)
2170		return ret;
2171
2172	/* Convert trace_arg to probe_arg */
2173	pev->nargs = tev->nargs;
2174	pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2175	if (pev->args == NULL)
2176		return -ENOMEM;
2177	for (i = 0; i < tev->nargs && ret >= 0; i++) {
2178		if (tev->args[i].name)
2179			pev->args[i].name = strdup(tev->args[i].name);
2180		else {
2181			if ((ret = strbuf_init(&buf, 32)) < 0)
2182				goto error;
2183			ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2184			pev->args[i].name = strbuf_detach(&buf, NULL);
2185		}
2186		if (pev->args[i].name == NULL && ret >= 0)
2187			ret = -ENOMEM;
2188	}
2189error:
2190	if (ret < 0)
2191		clear_perf_probe_event(pev);
2192
2193	return ret;
2194}
2195
2196void clear_perf_probe_event(struct perf_probe_event *pev)
2197{
2198	struct perf_probe_arg_field *field, *next;
2199	int i;
2200
2201	free(pev->event);
2202	free(pev->group);
2203	free(pev->target);
2204	clear_perf_probe_point(&pev->point);
2205
2206	for (i = 0; i < pev->nargs; i++) {
2207		free(pev->args[i].name);
2208		free(pev->args[i].var);
2209		free(pev->args[i].type);
2210		field = pev->args[i].field;
2211		while (field) {
2212			next = field->next;
2213			zfree(&field->name);
2214			free(field);
2215			field = next;
2216		}
2217	}
2218	free(pev->args);
2219	memset(pev, 0, sizeof(*pev));
2220}
2221
2222#define strdup_or_goto(str, label)	\
2223({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2224
2225static int perf_probe_point__copy(struct perf_probe_point *dst,
2226				  struct perf_probe_point *src)
2227{
2228	dst->file = strdup_or_goto(src->file, out_err);
2229	dst->function = strdup_or_goto(src->function, out_err);
2230	dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2231	dst->line = src->line;
2232	dst->retprobe = src->retprobe;
2233	dst->offset = src->offset;
2234	return 0;
2235
2236out_err:
2237	clear_perf_probe_point(dst);
2238	return -ENOMEM;
2239}
2240
2241static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2242				struct perf_probe_arg *src)
2243{
2244	struct perf_probe_arg_field *field, **ppfield;
2245
2246	dst->name = strdup_or_goto(src->name, out_err);
2247	dst->var = strdup_or_goto(src->var, out_err);
2248	dst->type = strdup_or_goto(src->type, out_err);
2249
2250	field = src->field;
2251	ppfield = &(dst->field);
2252	while (field) {
2253		*ppfield = zalloc(sizeof(*field));
2254		if (!*ppfield)
2255			goto out_err;
2256		(*ppfield)->name = strdup_or_goto(field->name, out_err);
2257		(*ppfield)->index = field->index;
2258		(*ppfield)->ref = field->ref;
2259		field = field->next;
2260		ppfield = &((*ppfield)->next);
2261	}
2262	return 0;
2263out_err:
2264	return -ENOMEM;
2265}
2266
2267int perf_probe_event__copy(struct perf_probe_event *dst,
2268			   struct perf_probe_event *src)
2269{
2270	int i;
2271
2272	dst->event = strdup_or_goto(src->event, out_err);
2273	dst->group = strdup_or_goto(src->group, out_err);
2274	dst->target = strdup_or_goto(src->target, out_err);
2275	dst->uprobes = src->uprobes;
2276
2277	if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2278		goto out_err;
2279
2280	dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2281	if (!dst->args)
2282		goto out_err;
2283	dst->nargs = src->nargs;
2284
2285	for (i = 0; i < src->nargs; i++)
2286		if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2287			goto out_err;
2288	return 0;
2289
2290out_err:
2291	clear_perf_probe_event(dst);
2292	return -ENOMEM;
2293}
2294
2295void clear_probe_trace_event(struct probe_trace_event *tev)
2296{
2297	struct probe_trace_arg_ref *ref, *next;
2298	int i;
2299
2300	free(tev->event);
2301	free(tev->group);
2302	free(tev->point.symbol);
2303	free(tev->point.realname);
2304	free(tev->point.module);
2305	for (i = 0; i < tev->nargs; i++) {
2306		free(tev->args[i].name);
2307		free(tev->args[i].value);
2308		free(tev->args[i].type);
2309		ref = tev->args[i].ref;
2310		while (ref) {
2311			next = ref->next;
2312			free(ref);
2313			ref = next;
2314		}
2315	}
2316	free(tev->args);
2317	memset(tev, 0, sizeof(*tev));
2318}
2319
2320struct kprobe_blacklist_node {
2321	struct list_head list;
2322	unsigned long start;
2323	unsigned long end;
2324	char *symbol;
2325};
2326
2327static void kprobe_blacklist__delete(struct list_head *blacklist)
2328{
2329	struct kprobe_blacklist_node *node;
2330
2331	while (!list_empty(blacklist)) {
2332		node = list_first_entry(blacklist,
2333					struct kprobe_blacklist_node, list);
2334		list_del(&node->list);
2335		free(node->symbol);
2336		free(node);
2337	}
2338}
2339
2340static int kprobe_blacklist__load(struct list_head *blacklist)
2341{
2342	struct kprobe_blacklist_node *node;
2343	const char *__debugfs = debugfs__mountpoint();
2344	char buf[PATH_MAX], *p;
2345	FILE *fp;
2346	int ret;
2347
2348	if (__debugfs == NULL)
2349		return -ENOTSUP;
2350
2351	ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2352	if (ret < 0)
2353		return ret;
2354
2355	fp = fopen(buf, "r");
2356	if (!fp)
2357		return -errno;
2358
2359	ret = 0;
2360	while (fgets(buf, PATH_MAX, fp)) {
2361		node = zalloc(sizeof(*node));
2362		if (!node) {
2363			ret = -ENOMEM;
2364			break;
2365		}
2366		INIT_LIST_HEAD(&node->list);
2367		list_add_tail(&node->list, blacklist);
2368		if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2369			ret = -EINVAL;
2370			break;
2371		}
2372		p = strchr(buf, '\t');
2373		if (p) {
2374			p++;
2375			if (p[strlen(p) - 1] == '\n')
2376				p[strlen(p) - 1] = '\0';
2377		} else
2378			p = (char *)"unknown";
2379		node->symbol = strdup(p);
2380		if (!node->symbol) {
2381			ret = -ENOMEM;
2382			break;
2383		}
2384		pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2385			  node->start, node->end, node->symbol);
2386		ret++;
2387	}
2388	if (ret < 0)
2389		kprobe_blacklist__delete(blacklist);
2390	fclose(fp);
2391
2392	return ret;
2393}
2394
2395static struct kprobe_blacklist_node *
2396kprobe_blacklist__find_by_address(struct list_head *blacklist,
2397				  unsigned long address)
2398{
2399	struct kprobe_blacklist_node *node;
2400
2401	list_for_each_entry(node, blacklist, list) {
2402		if (node->start <= address && address < node->end)
2403			return node;
2404	}
2405
2406	return NULL;
2407}
2408
2409static LIST_HEAD(kprobe_blacklist);
2410
2411static void kprobe_blacklist__init(void)
2412{
2413	if (!list_empty(&kprobe_blacklist))
2414		return;
2415
2416	if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2417		pr_debug("No kprobe blacklist support, ignored\n");
2418}
2419
2420static void kprobe_blacklist__release(void)
2421{
2422	kprobe_blacklist__delete(&kprobe_blacklist);
2423}
2424
2425static bool kprobe_blacklist__listed(unsigned long address)
2426{
2427	return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2428}
2429
2430static int perf_probe_event__sprintf(const char *group, const char *event,
2431				     struct perf_probe_event *pev,
2432				     const char *module,
2433				     struct strbuf *result)
2434{
2435	int i, ret;
2436	char *buf;
2437
2438	if (asprintf(&buf, "%s:%s", group, event) < 0)
2439		return -errno;
2440	ret = strbuf_addf(result, "  %-20s (on ", buf);
2441	free(buf);
2442	if (ret)
2443		return ret;
2444
2445	/* Synthesize only event probe point */
2446	buf = synthesize_perf_probe_point(&pev->point);
2447	if (!buf)
2448		return -ENOMEM;
2449	ret = strbuf_addstr(result, buf);
2450	free(buf);
2451
2452	if (!ret && module)
2453		ret = strbuf_addf(result, " in %s", module);
 
2454
2455	if (!ret && pev->nargs > 0) {
2456		ret = strbuf_add(result, " with", 5);
2457		for (i = 0; !ret && i < pev->nargs; i++) {
2458			buf = synthesize_perf_probe_arg(&pev->args[i]);
2459			if (!buf)
2460				return -ENOMEM;
2461			ret = strbuf_addf(result, " %s", buf);
2462			free(buf);
 
 
 
 
2463		}
2464	}
2465	if (!ret)
2466		ret = strbuf_addch(result, ')');
2467
2468	return ret;
2469}
2470
2471/* Show an event */
2472int show_perf_probe_event(const char *group, const char *event,
2473			  struct perf_probe_event *pev,
2474			  const char *module, bool use_stdout)
2475{
2476	struct strbuf buf = STRBUF_INIT;
2477	int ret;
2478
2479	ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2480	if (ret >= 0) {
2481		if (use_stdout)
2482			printf("%s\n", buf.buf);
2483		else
2484			pr_info("%s\n", buf.buf);
2485	}
2486	strbuf_release(&buf);
2487
2488	return ret;
2489}
2490
2491static bool filter_probe_trace_event(struct probe_trace_event *tev,
2492				     struct strfilter *filter)
2493{
2494	char tmp[128];
2495
2496	/* At first, check the event name itself */
2497	if (strfilter__compare(filter, tev->event))
2498		return true;
2499
2500	/* Next, check the combination of name and group */
2501	if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2502		return false;
2503	return strfilter__compare(filter, tmp);
2504}
2505
2506static int __show_perf_probe_events(int fd, bool is_kprobe,
2507				    struct strfilter *filter)
2508{
2509	int ret = 0;
2510	struct probe_trace_event tev;
2511	struct perf_probe_event pev;
2512	struct strlist *rawlist;
2513	struct str_node *ent;
2514
2515	memset(&tev, 0, sizeof(tev));
2516	memset(&pev, 0, sizeof(pev));
2517
2518	rawlist = probe_file__get_rawlist(fd);
2519	if (!rawlist)
2520		return -ENOMEM;
2521
2522	strlist__for_each_entry(ent, rawlist) {
2523		ret = parse_probe_trace_command(ent->s, &tev);
2524		if (ret >= 0) {
2525			if (!filter_probe_trace_event(&tev, filter))
2526				goto next;
2527			ret = convert_to_perf_probe_event(&tev, &pev,
2528								is_kprobe);
2529			if (ret < 0)
2530				goto next;
2531			ret = show_perf_probe_event(pev.group, pev.event,
2532						    &pev, tev.point.module,
2533						    true);
2534		}
2535next:
2536		clear_perf_probe_event(&pev);
2537		clear_probe_trace_event(&tev);
2538		if (ret < 0)
2539			break;
2540	}
2541	strlist__delete(rawlist);
2542	/* Cleanup cached debuginfo if needed */
2543	debuginfo_cache__exit();
2544
2545	return ret;
2546}
2547
2548/* List up current perf-probe events */
2549int show_perf_probe_events(struct strfilter *filter)
2550{
2551	int kp_fd, up_fd, ret;
2552
2553	setup_pager();
2554
2555	if (probe_conf.cache)
2556		return probe_cache__show_all_caches(filter);
2557
2558	ret = init_probe_symbol_maps(false);
2559	if (ret < 0)
2560		return ret;
2561
2562	ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2563	if (ret < 0)
2564		return ret;
2565
2566	if (kp_fd >= 0)
2567		ret = __show_perf_probe_events(kp_fd, true, filter);
2568	if (up_fd >= 0 && ret >= 0)
2569		ret = __show_perf_probe_events(up_fd, false, filter);
2570	if (kp_fd > 0)
2571		close(kp_fd);
2572	if (up_fd > 0)
2573		close(up_fd);
2574	exit_probe_symbol_maps();
2575
2576	return ret;
2577}
2578
2579static int get_new_event_name(char *buf, size_t len, const char *base,
2580			      struct strlist *namelist, bool ret_event,
2581			      bool allow_suffix)
2582{
2583	int i, ret;
2584	char *p, *nbase;
2585
2586	if (*base == '.')
2587		base++;
2588	nbase = strdup(base);
2589	if (!nbase)
2590		return -ENOMEM;
2591
2592	/* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2593	p = strpbrk(nbase, ".@");
2594	if (p && p != nbase)
2595		*p = '\0';
2596
2597	/* Try no suffix number */
2598	ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2599	if (ret < 0) {
2600		pr_debug("snprintf() failed: %d\n", ret);
2601		goto out;
2602	}
2603	if (!strlist__has_entry(namelist, buf))
2604		goto out;
2605
2606	if (!allow_suffix) {
2607		pr_warning("Error: event \"%s\" already exists.\n"
2608			   " Hint: Remove existing event by 'perf probe -d'\n"
2609			   "       or force duplicates by 'perf probe -f'\n"
2610			   "       or set 'force=yes' in BPF source.\n",
2611			   buf);
2612		ret = -EEXIST;
2613		goto out;
2614	}
2615
2616	/* Try to add suffix */
2617	for (i = 1; i < MAX_EVENT_INDEX; i++) {
2618		ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2619		if (ret < 0) {
2620			pr_debug("snprintf() failed: %d\n", ret);
2621			goto out;
2622		}
2623		if (!strlist__has_entry(namelist, buf))
2624			break;
2625	}
2626	if (i == MAX_EVENT_INDEX) {
2627		pr_warning("Too many events are on the same function.\n");
2628		ret = -ERANGE;
2629	}
2630
2631out:
2632	free(nbase);
2633
2634	/* Final validation */
2635	if (ret >= 0 && !is_c_func_name(buf)) {
2636		pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2637			   buf);
2638		ret = -EINVAL;
2639	}
2640
2641	return ret;
2642}
2643
2644/* Warn if the current kernel's uprobe implementation is old */
2645static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2646{
2647	int i;
2648	char *buf = synthesize_probe_trace_command(tev);
2649
2650	/* Old uprobe event doesn't support memory dereference */
2651	if (!tev->uprobes || tev->nargs == 0 || !buf)
2652		goto out;
2653
2654	for (i = 0; i < tev->nargs; i++)
2655		if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2656			pr_warning("Please upgrade your kernel to at least "
2657				   "3.14 to have access to feature %s\n",
2658				   tev->args[i].value);
2659			break;
2660		}
2661out:
2662	free(buf);
2663}
2664
2665/* Set new name from original perf_probe_event and namelist */
2666static int probe_trace_event__set_name(struct probe_trace_event *tev,
2667				       struct perf_probe_event *pev,
2668				       struct strlist *namelist,
2669				       bool allow_suffix)
2670{
2671	const char *event, *group;
2672	char buf[64];
2673	int ret;
2674
2675	/* If probe_event or trace_event already have the name, reuse it */
2676	if (pev->event && !pev->sdt)
2677		event = pev->event;
2678	else if (tev->event)
2679		event = tev->event;
2680	else {
2681		/* Or generate new one from probe point */
2682		if (pev->point.function &&
2683			(strncmp(pev->point.function, "0x", 2) != 0) &&
2684			!strisglob(pev->point.function))
2685			event = pev->point.function;
2686		else
2687			event = tev->point.realname;
2688	}
2689	if (pev->group && !pev->sdt)
2690		group = pev->group;
2691	else if (tev->group)
2692		group = tev->group;
2693	else
2694		group = PERFPROBE_GROUP;
2695
2696	/* Get an unused new event name */
2697	ret = get_new_event_name(buf, 64, event, namelist,
2698				 tev->point.retprobe, allow_suffix);
2699	if (ret < 0)
2700		return ret;
2701
2702	event = buf;
2703
2704	tev->event = strdup(event);
2705	tev->group = strdup(group);
2706	if (tev->event == NULL || tev->group == NULL)
2707		return -ENOMEM;
2708
2709	/* Add added event name to namelist */
2710	strlist__add(namelist, event);
2711	return 0;
2712}
2713
2714static int __open_probe_file_and_namelist(bool uprobe,
2715					  struct strlist **namelist)
 
2716{
2717	int fd;
 
 
2718
2719	fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2720	if (fd < 0)
2721		return fd;
2722
2723	/* Get current event names */
2724	*namelist = probe_file__get_namelist(fd);
2725	if (!(*namelist)) {
2726		pr_debug("Failed to get current event list.\n");
2727		close(fd);
2728		return -ENOMEM;
2729	}
2730	return fd;
2731}
2732
2733static int __add_probe_trace_events(struct perf_probe_event *pev,
2734				     struct probe_trace_event *tevs,
2735				     int ntevs, bool allow_suffix)
2736{
2737	int i, fd[2] = {-1, -1}, up, ret;
2738	struct probe_trace_event *tev = NULL;
2739	struct probe_cache *cache = NULL;
2740	struct strlist *namelist[2] = {NULL, NULL};
2741	struct nscookie nsc;
2742
2743	up = pev->uprobes ? 1 : 0;
2744	fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2745	if (fd[up] < 0)
2746		return fd[up];
2747
2748	ret = 0;
2749	for (i = 0; i < ntevs; i++) {
2750		tev = &tevs[i];
2751		up = tev->uprobes ? 1 : 0;
2752		if (fd[up] == -1) {	/* Open the kprobe/uprobe_events */
2753			fd[up] = __open_probe_file_and_namelist(up,
2754								&namelist[up]);
2755			if (fd[up] < 0)
2756				goto close_out;
2757		}
2758		/* Skip if the symbol is out of .text or blacklisted */
2759		if (!tev->point.symbol && !pev->uprobes)
2760			continue;
2761
2762		/* Set new name for tev (and update namelist) */
2763		ret = probe_trace_event__set_name(tev, pev, namelist[up],
2764						  allow_suffix);
2765		if (ret < 0)
2766			break;
2767
2768		nsinfo__mountns_enter(pev->nsi, &nsc);
2769		ret = probe_file__add_event(fd[up], tev);
2770		nsinfo__mountns_exit(&nsc);
2771		if (ret < 0)
2772			break;
2773
2774		/*
2775		 * Probes after the first probe which comes from same
2776		 * user input are always allowed to add suffix, because
2777		 * there might be several addresses corresponding to
2778		 * one code line.
2779		 */
2780		allow_suffix = true;
2781	}
2782	if (ret == -EINVAL && pev->uprobes)
2783		warn_uprobe_event_compat(tev);
2784	if (ret == 0 && probe_conf.cache) {
2785		cache = probe_cache__new(pev->target, pev->nsi);
2786		if (!cache ||
2787		    probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2788		    probe_cache__commit(cache) < 0)
2789			pr_warning("Failed to add event to probe cache\n");
2790		probe_cache__delete(cache);
2791	}
2792
 
2793close_out:
2794	for (up = 0; up < 2; up++) {
2795		strlist__delete(namelist[up]);
2796		if (fd[up] >= 0)
2797			close(fd[up]);
2798	}
2799	return ret;
2800}
2801
2802static int find_probe_functions(struct map *map, char *name,
2803				struct symbol **syms)
2804{
2805	int found = 0;
2806	struct symbol *sym;
2807	struct rb_node *tmp;
2808	const char *norm, *ver;
2809	char *buf = NULL;
2810	bool cut_version = true;
2811
2812	if (map__load(map) < 0)
2813		return 0;
2814
2815	/* If user gives a version, don't cut off the version from symbols */
2816	if (strchr(name, '@'))
2817		cut_version = false;
2818
2819	map__for_each_symbol(map, sym, tmp) {
2820		norm = arch__normalize_symbol_name(sym->name);
2821		if (!norm)
2822			continue;
2823
2824		if (cut_version) {
2825			/* We don't care about default symbol or not */
2826			ver = strchr(norm, '@');
2827			if (ver) {
2828				buf = strndup(norm, ver - norm);
2829				if (!buf)
2830					return -ENOMEM;
2831				norm = buf;
2832			}
2833		}
2834
2835		if (strglobmatch(norm, name)) {
2836			found++;
2837			if (syms && found < probe_conf.max_probes)
2838				syms[found - 1] = sym;
2839		}
2840		if (buf)
2841			zfree(&buf);
2842	}
2843
2844	return found;
2845}
2846
 
 
 
2847void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2848				struct probe_trace_event *tev __maybe_unused,
2849				struct map *map __maybe_unused,
2850				struct symbol *sym __maybe_unused) { }
2851
2852/*
2853 * Find probe function addresses from map.
2854 * Return an error or the number of found probe_trace_event
2855 */
2856static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2857					    struct probe_trace_event **tevs)
2858{
2859	struct map *map = NULL;
2860	struct ref_reloc_sym *reloc_sym = NULL;
2861	struct symbol *sym;
2862	struct symbol **syms = NULL;
2863	struct probe_trace_event *tev;
2864	struct perf_probe_point *pp = &pev->point;
2865	struct probe_trace_point *tp;
2866	int num_matched_functions;
2867	int ret, i, j, skipped = 0;
2868	char *mod_name;
2869
2870	map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2871	if (!map) {
2872		ret = -EINVAL;
2873		goto out;
2874	}
2875
2876	syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2877	if (!syms) {
2878		ret = -ENOMEM;
2879		goto out;
2880	}
2881
2882	/*
2883	 * Load matched symbols: Since the different local symbols may have
2884	 * same name but different addresses, this lists all the symbols.
2885	 */
2886	num_matched_functions = find_probe_functions(map, pp->function, syms);
2887	if (num_matched_functions <= 0) {
2888		pr_err("Failed to find symbol %s in %s\n", pp->function,
2889			pev->target ? : "kernel");
2890		ret = -ENOENT;
2891		goto out;
2892	} else if (num_matched_functions > probe_conf.max_probes) {
2893		pr_err("Too many functions matched in %s\n",
2894			pev->target ? : "kernel");
2895		ret = -E2BIG;
2896		goto out;
2897	}
2898
2899	/* Note that the symbols in the kmodule are not relocated */
2900	if (!pev->uprobes && !pev->target &&
2901			(!pp->retprobe || kretprobe_offset_is_supported())) {
2902		reloc_sym = kernel_get_ref_reloc_sym();
2903		if (!reloc_sym) {
2904			pr_warning("Relocated base symbol is not found!\n");
2905			ret = -EINVAL;
2906			goto out;
2907		}
2908	}
2909
2910	/* Setup result trace-probe-events */
2911	*tevs = zalloc(sizeof(*tev) * num_matched_functions);
2912	if (!*tevs) {
2913		ret = -ENOMEM;
2914		goto out;
2915	}
2916
2917	ret = 0;
2918
2919	for (j = 0; j < num_matched_functions; j++) {
2920		sym = syms[j];
2921
2922		tev = (*tevs) + ret;
2923		tp = &tev->point;
2924		if (ret == num_matched_functions) {
2925			pr_warning("Too many symbols are listed. Skip it.\n");
2926			break;
2927		}
2928		ret++;
2929
2930		if (pp->offset > sym->end - sym->start) {
2931			pr_warning("Offset %ld is bigger than the size of %s\n",
2932				   pp->offset, sym->name);
2933			ret = -ENOENT;
2934			goto err_out;
2935		}
2936		/* Add one probe point */
2937		tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2938
2939		/* Check the kprobe (not in module) is within .text  */
2940		if (!pev->uprobes && !pev->target &&
2941		    kprobe_warn_out_range(sym->name, tp->address)) {
2942			tp->symbol = NULL;	/* Skip it */
2943			skipped++;
2944		} else if (reloc_sym) {
2945			tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2946			tp->offset = tp->address - reloc_sym->addr;
2947		} else {
2948			tp->symbol = strdup_or_goto(sym->name, nomem_out);
2949			tp->offset = pp->offset;
2950		}
2951		tp->realname = strdup_or_goto(sym->name, nomem_out);
2952
2953		tp->retprobe = pp->retprobe;
2954		if (pev->target) {
2955			if (pev->uprobes) {
2956				tev->point.module = strdup_or_goto(pev->target,
2957								   nomem_out);
2958			} else {
2959				mod_name = find_module_name(pev->target);
2960				tev->point.module =
2961					strdup(mod_name ? mod_name : pev->target);
2962				free(mod_name);
2963				if (!tev->point.module)
2964					goto nomem_out;
2965			}
2966		}
2967		tev->uprobes = pev->uprobes;
2968		tev->nargs = pev->nargs;
2969		if (tev->nargs) {
2970			tev->args = zalloc(sizeof(struct probe_trace_arg) *
2971					   tev->nargs);
2972			if (tev->args == NULL)
2973				goto nomem_out;
2974		}
2975		for (i = 0; i < tev->nargs; i++) {
2976			if (pev->args[i].name)
2977				tev->args[i].name =
2978					strdup_or_goto(pev->args[i].name,
2979							nomem_out);
2980
2981			tev->args[i].value = strdup_or_goto(pev->args[i].var,
2982							    nomem_out);
2983			if (pev->args[i].type)
2984				tev->args[i].type =
2985					strdup_or_goto(pev->args[i].type,
2986							nomem_out);
2987		}
2988		arch__fix_tev_from_maps(pev, tev, map, sym);
2989	}
2990	if (ret == skipped) {
2991		ret = -ENOENT;
2992		goto err_out;
2993	}
2994
2995out:
2996	map__put(map);
2997	free(syms);
2998	return ret;
2999
3000nomem_out:
3001	ret = -ENOMEM;
3002err_out:
3003	clear_probe_trace_events(*tevs, num_matched_functions);
3004	zfree(tevs);
3005	goto out;
3006}
3007
3008static int try_to_find_absolute_address(struct perf_probe_event *pev,
3009					struct probe_trace_event **tevs)
3010{
3011	struct perf_probe_point *pp = &pev->point;
3012	struct probe_trace_event *tev;
3013	struct probe_trace_point *tp;
3014	int i, err;
3015
3016	if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3017		return -EINVAL;
3018	if (perf_probe_event_need_dwarf(pev))
3019		return -EINVAL;
3020
3021	/*
3022	 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3023	 * absolute address.
3024	 *
3025	 * Only one tev can be generated by this.
3026	 */
3027	*tevs = zalloc(sizeof(*tev));
3028	if (!*tevs)
3029		return -ENOMEM;
3030
3031	tev = *tevs;
3032	tp = &tev->point;
3033
3034	/*
3035	 * Don't use tp->offset, use address directly, because
3036	 * in synthesize_probe_trace_command() address cannot be
3037	 * zero.
3038	 */
3039	tp->address = pev->point.abs_address;
3040	tp->retprobe = pp->retprobe;
3041	tev->uprobes = pev->uprobes;
3042
3043	err = -ENOMEM;
3044	/*
3045	 * Give it a '0x' leading symbol name.
3046	 * In __add_probe_trace_events, a NULL symbol is interpreted as
3047	 * invalud.
3048	 */
3049	if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3050		goto errout;
3051
3052	/* For kprobe, check range */
3053	if ((!tev->uprobes) &&
3054	    (kprobe_warn_out_range(tev->point.symbol,
3055				   tev->point.address))) {
3056		err = -EACCES;
3057		goto errout;
3058	}
3059
3060	if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3061		goto errout;
3062
3063	if (pev->target) {
3064		tp->module = strdup(pev->target);
3065		if (!tp->module)
3066			goto errout;
3067	}
3068
3069	if (tev->group) {
3070		tev->group = strdup(pev->group);
3071		if (!tev->group)
3072			goto errout;
3073	}
3074
3075	if (pev->event) {
3076		tev->event = strdup(pev->event);
3077		if (!tev->event)
3078			goto errout;
3079	}
3080
3081	tev->nargs = pev->nargs;
3082	tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3083	if (!tev->args)
 
3084		goto errout;
3085
3086	for (i = 0; i < tev->nargs; i++)
3087		copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3088
3089	return 1;
3090
3091errout:
3092	clear_probe_trace_events(*tevs, 1);
3093	*tevs = NULL;
3094	return err;
3095}
3096
3097/* Concatinate two arrays */
3098static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3099{
3100	void *ret;
3101
3102	ret = malloc(sz_a + sz_b);
3103	if (ret) {
3104		memcpy(ret, a, sz_a);
3105		memcpy(ret + sz_a, b, sz_b);
3106	}
3107	return ret;
3108}
3109
3110static int
3111concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3112			  struct probe_trace_event **tevs2, int ntevs2)
3113{
3114	struct probe_trace_event *new_tevs;
3115	int ret = 0;
3116
3117	if (*ntevs == 0) {
3118		*tevs = *tevs2;
3119		*ntevs = ntevs2;
3120		*tevs2 = NULL;
3121		return 0;
3122	}
3123
3124	if (*ntevs + ntevs2 > probe_conf.max_probes)
3125		ret = -E2BIG;
3126	else {
3127		/* Concatinate the array of probe_trace_event */
3128		new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3129				  *tevs2, ntevs2 * sizeof(**tevs2));
3130		if (!new_tevs)
3131			ret = -ENOMEM;
3132		else {
3133			free(*tevs);
3134			*tevs = new_tevs;
3135			*ntevs += ntevs2;
3136		}
3137	}
3138	if (ret < 0)
3139		clear_probe_trace_events(*tevs2, ntevs2);
3140	zfree(tevs2);
3141
3142	return ret;
3143}
3144
3145/*
3146 * Try to find probe_trace_event from given probe caches. Return the number
3147 * of cached events found, if an error occurs return the error.
3148 */
3149static int find_cached_events(struct perf_probe_event *pev,
3150			      struct probe_trace_event **tevs,
3151			      const char *target)
3152{
3153	struct probe_cache *cache;
3154	struct probe_cache_entry *entry;
3155	struct probe_trace_event *tmp_tevs = NULL;
3156	int ntevs = 0;
3157	int ret = 0;
3158
3159	cache = probe_cache__new(target, pev->nsi);
3160	/* Return 0 ("not found") if the target has no probe cache. */
3161	if (!cache)
3162		return 0;
3163
3164	for_each_probe_cache_entry(entry, cache) {
3165		/* Skip the cache entry which has no name */
3166		if (!entry->pev.event || !entry->pev.group)
3167			continue;
3168		if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3169		    strglobmatch(entry->pev.event, pev->event)) {
3170			ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3171			if (ret > 0)
3172				ret = concat_probe_trace_events(tevs, &ntevs,
3173								&tmp_tevs, ret);
3174			if (ret < 0)
3175				break;
3176		}
3177	}
3178	probe_cache__delete(cache);
3179	if (ret < 0) {
3180		clear_probe_trace_events(*tevs, ntevs);
3181		zfree(tevs);
3182	} else {
3183		ret = ntevs;
3184		if (ntevs > 0 && target && target[0] == '/')
3185			pev->uprobes = true;
3186	}
3187
3188	return ret;
3189}
3190
3191/* Try to find probe_trace_event from all probe caches */
3192static int find_cached_events_all(struct perf_probe_event *pev,
3193				   struct probe_trace_event **tevs)
3194{
3195	struct probe_trace_event *tmp_tevs = NULL;
3196	struct strlist *bidlist;
3197	struct str_node *nd;
3198	char *pathname;
3199	int ntevs = 0;
3200	int ret;
3201
3202	/* Get the buildid list of all valid caches */
3203	bidlist = build_id_cache__list_all(true);
3204	if (!bidlist) {
3205		ret = -errno;
3206		pr_debug("Failed to get buildids: %d\n", ret);
3207		return ret;
3208	}
3209
3210	ret = 0;
3211	strlist__for_each_entry(nd, bidlist) {
3212		pathname = build_id_cache__origname(nd->s);
3213		ret = find_cached_events(pev, &tmp_tevs, pathname);
3214		/* In the case of cnt == 0, we just skip it */
3215		if (ret > 0)
3216			ret = concat_probe_trace_events(tevs, &ntevs,
3217							&tmp_tevs, ret);
3218		free(pathname);
3219		if (ret < 0)
3220			break;
3221	}
3222	strlist__delete(bidlist);
3223
3224	if (ret < 0) {
3225		clear_probe_trace_events(*tevs, ntevs);
3226		zfree(tevs);
3227	} else
3228		ret = ntevs;
3229
3230	return ret;
3231}
3232
3233static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3234					      struct probe_trace_event **tevs)
3235{
3236	struct probe_cache *cache;
3237	struct probe_cache_entry *entry;
3238	struct probe_trace_event *tev;
3239	struct str_node *node;
3240	int ret, i;
3241
3242	if (pev->sdt) {
3243		/* For SDT/cached events, we use special search functions */
3244		if (!pev->target)
3245			return find_cached_events_all(pev, tevs);
3246		else
3247			return find_cached_events(pev, tevs, pev->target);
3248	}
3249	cache = probe_cache__new(pev->target, pev->nsi);
3250	if (!cache)
3251		return 0;
3252
3253	entry = probe_cache__find(cache, pev);
3254	if (!entry) {
3255		/* SDT must be in the cache */
3256		ret = pev->sdt ? -ENOENT : 0;
3257		goto out;
3258	}
3259
3260	ret = strlist__nr_entries(entry->tevlist);
3261	if (ret > probe_conf.max_probes) {
3262		pr_debug("Too many entries matched in the cache of %s\n",
3263			 pev->target ? : "kernel");
3264		ret = -E2BIG;
3265		goto out;
3266	}
3267
3268	*tevs = zalloc(ret * sizeof(*tev));
3269	if (!*tevs) {
3270		ret = -ENOMEM;
3271		goto out;
3272	}
3273
3274	i = 0;
3275	strlist__for_each_entry(node, entry->tevlist) {
3276		tev = &(*tevs)[i++];
3277		ret = parse_probe_trace_command(node->s, tev);
3278		if (ret < 0)
3279			goto out;
3280		/* Set the uprobes attribute as same as original */
3281		tev->uprobes = pev->uprobes;
3282	}
3283	ret = i;
3284
3285out:
3286	probe_cache__delete(cache);
3287	return ret;
3288}
3289
3290static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3291					 struct probe_trace_event **tevs)
3292{
3293	int ret;
3294
3295	if (!pev->group && !pev->sdt) {
3296		/* Set group name if not given */
3297		if (!pev->uprobes) {
3298			pev->group = strdup(PERFPROBE_GROUP);
3299			ret = pev->group ? 0 : -ENOMEM;
3300		} else
3301			ret = convert_exec_to_group(pev->target, &pev->group);
3302		if (ret != 0) {
3303			pr_warning("Failed to make a group name.\n");
3304			return ret;
3305		}
3306	}
3307
3308	ret = try_to_find_absolute_address(pev, tevs);
3309	if (ret > 0)
3310		return ret;
3311
3312	/* At first, we need to lookup cache entry */
3313	ret = find_probe_trace_events_from_cache(pev, tevs);
3314	if (ret > 0 || pev->sdt)	/* SDT can be found only in the cache */
3315		return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
 
3316
3317	/* Convert perf_probe_event with debuginfo */
3318	ret = try_to_find_probe_trace_events(pev, tevs);
3319	if (ret != 0)
3320		return ret;	/* Found in debuginfo or got an error */
3321
3322	return find_probe_trace_events_from_map(pev, tevs);
3323}
3324
3325int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3326{
3327	int i, ret;
3328
3329	/* Loop 1: convert all events */
3330	for (i = 0; i < npevs; i++) {
3331		/* Init kprobe blacklist if needed */
3332		if (!pevs[i].uprobes)
3333			kprobe_blacklist__init();
3334		/* Convert with or without debuginfo */
3335		ret  = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3336		if (ret < 0)
3337			return ret;
3338		pevs[i].ntevs = ret;
3339	}
3340	/* This just release blacklist only if allocated */
3341	kprobe_blacklist__release();
3342
3343	return 0;
3344}
3345
3346static int show_probe_trace_event(struct probe_trace_event *tev)
3347{
3348	char *buf = synthesize_probe_trace_command(tev);
3349
3350	if (!buf) {
3351		pr_debug("Failed to synthesize probe trace event.\n");
3352		return -EINVAL;
3353	}
3354
3355	/* Showing definition always go stdout */
3356	printf("%s\n", buf);
3357	free(buf);
3358
3359	return 0;
3360}
3361
3362int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3363{
3364	struct strlist *namelist = strlist__new(NULL, NULL);
3365	struct probe_trace_event *tev;
3366	struct perf_probe_event *pev;
3367	int i, j, ret = 0;
3368
3369	if (!namelist)
3370		return -ENOMEM;
3371
3372	for (j = 0; j < npevs && !ret; j++) {
3373		pev = &pevs[j];
3374		for (i = 0; i < pev->ntevs && !ret; i++) {
3375			tev = &pev->tevs[i];
3376			/* Skip if the symbol is out of .text or blacklisted */
3377			if (!tev->point.symbol && !pev->uprobes)
3378				continue;
3379
3380			/* Set new name for tev (and update namelist) */
3381			ret = probe_trace_event__set_name(tev, pev,
3382							  namelist, true);
3383			if (!ret)
3384				ret = show_probe_trace_event(tev);
3385		}
3386	}
3387	strlist__delete(namelist);
3388
3389	return ret;
3390}
3391
3392int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3393{
3394	int i, ret = 0;
3395
3396	/* Loop 2: add all events */
3397	for (i = 0; i < npevs; i++) {
3398		ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3399					       pevs[i].ntevs,
3400					       probe_conf.force_add);
3401		if (ret < 0)
3402			break;
3403	}
3404	return ret;
3405}
3406
3407void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3408{
3409	int i, j;
3410	struct perf_probe_event *pev;
3411
3412	/* Loop 3: cleanup and free trace events  */
3413	for (i = 0; i < npevs; i++) {
3414		pev = &pevs[i];
3415		for (j = 0; j < pevs[i].ntevs; j++)
3416			clear_probe_trace_event(&pevs[i].tevs[j]);
3417		zfree(&pevs[i].tevs);
3418		pevs[i].ntevs = 0;
3419		nsinfo__zput(pev->nsi);
3420		clear_perf_probe_event(&pevs[i]);
3421	}
3422}
3423
3424int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3425{
3426	int ret;
3427
3428	ret = init_probe_symbol_maps(pevs->uprobes);
3429	if (ret < 0)
3430		return ret;
3431
3432	ret = convert_perf_probe_events(pevs, npevs);
3433	if (ret == 0)
3434		ret = apply_perf_probe_events(pevs, npevs);
3435
3436	cleanup_perf_probe_events(pevs, npevs);
3437
3438	exit_probe_symbol_maps();
3439	return ret;
3440}
3441
3442int del_perf_probe_events(struct strfilter *filter)
3443{
3444	int ret, ret2, ufd = -1, kfd = -1;
3445	char *str = strfilter__string(filter);
3446
3447	if (!str)
3448		return -EINVAL;
3449
3450	/* Get current event names */
3451	ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3452	if (ret < 0)
3453		goto out;
3454
3455	ret = probe_file__del_events(kfd, filter);
3456	if (ret < 0 && ret != -ENOENT)
3457		goto error;
3458
3459	ret2 = probe_file__del_events(ufd, filter);
3460	if (ret2 < 0 && ret2 != -ENOENT) {
3461		ret = ret2;
3462		goto error;
3463	}
3464	ret = 0;
3465
3466error:
3467	if (kfd >= 0)
3468		close(kfd);
3469	if (ufd >= 0)
3470		close(ufd);
3471out:
3472	free(str);
3473
3474	return ret;
3475}
3476
3477int show_available_funcs(const char *target, struct nsinfo *nsi,
3478			 struct strfilter *_filter, bool user)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3479{
3480        struct rb_node *nd;
3481	struct map *map;
3482	int ret;
3483
3484	ret = init_probe_symbol_maps(user);
3485	if (ret < 0)
3486		return ret;
3487
3488	/* Get a symbol map */
3489	map = get_target_map(target, nsi, user);
 
 
 
3490	if (!map) {
3491		pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3492		return -EINVAL;
3493	}
3494
3495	ret = map__load(map);
3496	if (ret) {
3497		if (ret == -2) {
3498			char *str = strfilter__string(_filter);
3499			pr_err("Failed to find symbols matched to \"%s\"\n",
3500			       str);
3501			free(str);
3502		} else
3503			pr_err("Failed to load symbols in %s\n",
3504			       (target) ? : "kernel");
3505		goto end;
3506	}
3507	if (!dso__sorted_by_name(map->dso, map->type))
3508		dso__sort_by_name(map->dso, map->type);
3509
3510	/* Show all (filtered) symbols */
3511	setup_pager();
3512
3513        for (nd = rb_first(&map->dso->symbol_names[map->type]); nd; nd = rb_next(nd)) {
3514		struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3515
3516		if (strfilter__compare(_filter, pos->sym.name))
3517			printf("%s\n", pos->sym.name);
3518        }
3519
3520end:
3521	map__put(map);
 
 
3522	exit_probe_symbol_maps();
3523
3524	return ret;
3525}
3526
3527int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3528			    struct perf_probe_arg *pvar)
3529{
3530	tvar->value = strdup(pvar->var);
3531	if (tvar->value == NULL)
3532		return -ENOMEM;
3533	if (pvar->type) {
3534		tvar->type = strdup(pvar->type);
3535		if (tvar->type == NULL)
3536			return -ENOMEM;
3537	}
3538	if (pvar->name) {
3539		tvar->name = strdup(pvar->name);
3540		if (tvar->name == NULL)
3541			return -ENOMEM;
3542	} else
3543		tvar->name = NULL;
3544	return 0;
3545}