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