tools/perf/util/probe-event.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
e_snprintf
init_probe_symbol_maps
exit_probe_symbol_maps
kernel_get_ref_reloc_sym
kernel_get_symbol_address_by_name
kernel_get_module_map
get_target_map
convert_exec_to_group
clear_perf_probe_point
clear_probe_trace_events
kprobe_warn_out_range
find_module_name
kernel_get_module_dso
find_alternative_probe_point
get_alternative_probe_event
get_alternative_line_range
open_debuginfo
debuginfo_cache__open
debuginfo_cache__exit
get_text_start_address
find_perf_probe_point_from_dwarf
post_process_probe_trace_point
post_process_offline_probe_trace_events
add_exec_to_probe_trace_events
post_process_module_probe_trace_events
post_process_kernel_probe_trace_events
arch__post_process_probe_trace_events
post_process_probe_trace_events
try_to_find_probe_trace_events
__show_one_line
_show_one_line
__show_line_range
show_line_range
show_available_vars_at
show_available_vars
debuginfo_cache__exit
find_perf_probe_point_from_dwarf
try_to_find_probe_trace_events
show_line_range
show_available_vars
line_range__clear
line_range__init
parse_line_num
is_c_func_name
parse_line_range_desc
parse_perf_probe_event_name
parse_perf_probe_point
parse_perf_probe_arg
parse_perf_probe_command
perf_probe_with_var
perf_probe_event_need_dwarf
parse_probe_trace_command
synthesize_perf_probe_arg
synthesize_perf_probe_point
synthesize_perf_probe_command
__synthesize_probe_trace_arg_ref
synthesize_probe_trace_arg
synthesize_uprobe_trace_def
synthesize_probe_trace_command
find_perf_probe_point_from_map
convert_to_perf_probe_point
convert_to_perf_probe_event
clear_perf_probe_event
perf_probe_point__copy
perf_probe_arg__copy
perf_probe_event__copy
clear_probe_trace_event
kprobe_blacklist__delete
kprobe_blacklist__load
kprobe_blacklist__find_by_address
kprobe_blacklist__init
kprobe_blacklist__release
kprobe_blacklist__listed
perf_probe_event__sprintf
show_perf_probe_event
filter_probe_trace_event
__show_perf_probe_events
show_perf_probe_events
get_new_event_name
warn_uprobe_event_compat
probe_trace_event__set_name
__open_probe_file_and_namelist
__add_probe_trace_events
find_probe_functions
arch__fix_tev_from_maps
find_probe_trace_events_from_map
try_to_find_absolute_address
memcat
concat_probe_trace_events
find_cached_events
find_cached_events_all
find_probe_trace_events_from_cache
convert_to_probe_trace_events
convert_perf_probe_events
show_probe_trace_event
show_probe_trace_events
apply_perf_probe_events
cleanup_perf_probe_events
add_perf_probe_events
del_perf_probe_events
show_available_funcs
copy_to_probe_trace_arg
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * probe-event.c : perf-probe definition to probe_events format converter
   4  *
   5  * Written by Masami Hiramatsu <mhiramat@redhat.com>
   6  */
   7 
   8 #include <inttypes.h>
   9 #include <sys/utsname.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13 #include <errno.h>
  14 #include <stdio.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <stdarg.h>
  19 #include <limits.h>
  20 #include <elf.h>
  21 
  22 #include "build-id.h"
  23 #include "event.h"
  24 #include "namespaces.h"
  25 #include "strlist.h"
  26 #include "strfilter.h"
  27 #include "debug.h"
  28 #include "dso.h"
  29 #include "color.h"
  30 #include "map.h"
  31 #include "map_groups.h"
  32 #include "symbol.h"
  33 #include <api/fs/fs.h>
  34 #include "trace-event.h"        /* For __maybe_unused */
  35 #include "probe-event.h"
  36 #include "probe-finder.h"
  37 #include "probe-file.h"
  38 #include "session.h"
  39 #include "string2.h"
  40 #include "strbuf.h"
  41 
  42 #include <subcmd/pager.h>
  43 #include <linux/ctype.h>
  44 #include <linux/zalloc.h>
  45 
  46 #define PERFPROBE_GROUP "probe"
  47 
  48 bool probe_event_dry_run;       /* Dry run flag */
  49 struct probe_conf probe_conf;
  50 
  51 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
  52 
  53 int e_snprintf(char *str, size_t size, const char *format, ...)
  54 {
  55         int ret;
  56         va_list ap;
  57         va_start(ap, format);
  58         ret = vsnprintf(str, size, format, ap);
  59         va_end(ap);
  60         if (ret >= (int)size)
  61                 ret = -E2BIG;
  62         return ret;
  63 }
  64 
  65 static struct machine *host_machine;
  66 
  67 /* Initialize symbol maps and path of vmlinux/modules */
  68 int init_probe_symbol_maps(bool user_only)
  69 {
  70         int ret;
  71 
  72         symbol_conf.sort_by_name = true;
  73         symbol_conf.allow_aliases = true;
  74         ret = symbol__init(NULL);
  75         if (ret < 0) {
  76                 pr_debug("Failed to init symbol map.\n");
  77                 goto out;
  78         }
  79 
  80         if (host_machine || user_only)  /* already initialized */
  81                 return 0;
  82 
  83         if (symbol_conf.vmlinux_name)
  84                 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
  85 
  86         host_machine = machine__new_host();
  87         if (!host_machine) {
  88                 pr_debug("machine__new_host() failed.\n");
  89                 symbol__exit();
  90                 ret = -1;
  91         }
  92 out:
  93         if (ret < 0)
  94                 pr_warning("Failed to init vmlinux path.\n");
  95         return ret;
  96 }
  97 
  98 void exit_probe_symbol_maps(void)
  99 {
 100         machine__delete(host_machine);
 101         host_machine = NULL;
 102         symbol__exit();
 103 }
 104 
 105 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
 106 {
 107         /* kmap->ref_reloc_sym should be set if host_machine is initialized */
 108         struct kmap *kmap;
 109         struct map *map = machine__kernel_map(host_machine);
 110 
 111         if (map__load(map) < 0)
 112                 return NULL;
 113 
 114         kmap = map__kmap(map);
 115         if (!kmap)
 116                 return NULL;
 117         return kmap->ref_reloc_sym;
 118 }
 119 
 120 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
 121                                              bool reloc, bool reladdr)
 122 {
 123         struct ref_reloc_sym *reloc_sym;
 124         struct symbol *sym;
 125         struct map *map;
 126 
 127         /* ref_reloc_sym is just a label. Need a special fix*/
 128         reloc_sym = kernel_get_ref_reloc_sym();
 129         if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
 130                 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
 131         else {
 132                 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
 133                 if (!sym)
 134                         return -ENOENT;
 135                 *addr = map->unmap_ip(map, sym->start) -
 136                         ((reloc) ? 0 : map->reloc) -
 137                         ((reladdr) ? map->start : 0);
 138         }
 139         return 0;
 140 }
 141 
 142 static struct map *kernel_get_module_map(const char *module)
 143 {
 144         struct maps *maps = machine__kernel_maps(host_machine);
 145         struct map *pos;
 146 
 147         /* A file path -- this is an offline module */
 148         if (module && strchr(module, '/'))
 149                 return dso__new_map(module);
 150 
 151         if (!module) {
 152                 pos = machine__kernel_map(host_machine);
 153                 return map__get(pos);
 154         }
 155 
 156         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 157                 /* short_name is "[module]" */
 158                 if (strncmp(pos->dso->short_name + 1, module,
 159                             pos->dso->short_name_len - 2) == 0 &&
 160                     module[pos->dso->short_name_len - 2] == '\0') {
 161                         return map__get(pos);
 162                 }
 163         }
 164         return NULL;
 165 }
 166 
 167 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
 168 {
 169         /* Init maps of given executable or kernel */
 170         if (user) {
 171                 struct map *map;
 172 
 173                 map = dso__new_map(target);
 174                 if (map && map->dso)
 175                         map->dso->nsinfo = nsinfo__get(nsi);
 176                 return map;
 177         } else {
 178                 return kernel_get_module_map(target);
 179         }
 180 }
 181 
 182 static int convert_exec_to_group(const char *exec, char **result)
 183 {
 184         char *ptr1, *ptr2, *exec_copy;
 185         char buf[64];
 186         int ret;
 187 
 188         exec_copy = strdup(exec);
 189         if (!exec_copy)
 190                 return -ENOMEM;
 191 
 192         ptr1 = basename(exec_copy);
 193         if (!ptr1) {
 194                 ret = -EINVAL;
 195                 goto out;
 196         }
 197 
 198         for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
 199                 if (!isalnum(*ptr2) && *ptr2 != '_') {
 200                         *ptr2 = '\0';
 201                         break;
 202                 }
 203         }
 204 
 205         ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
 206         if (ret < 0)
 207                 goto out;
 208 
 209         *result = strdup(buf);
 210         ret = *result ? 0 : -ENOMEM;
 211 
 212 out:
 213         free(exec_copy);
 214         return ret;
 215 }
 216 
 217 static void clear_perf_probe_point(struct perf_probe_point *pp)
 218 {
 219         zfree(&pp->file);
 220         zfree(&pp->function);
 221         zfree(&pp->lazy_line);
 222 }
 223 
 224 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
 225 {
 226         int i;
 227 
 228         for (i = 0; i < ntevs; i++)
 229                 clear_probe_trace_event(tevs + i);
 230 }
 231 
 232 static bool kprobe_blacklist__listed(unsigned long address);
 233 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
 234 {
 235         u64 etext_addr = 0;
 236         int ret;
 237 
 238         /* Get the address of _etext for checking non-probable text symbol */
 239         ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
 240                                                 false, false);
 241 
 242         if (ret == 0 && etext_addr < address)
 243                 pr_warning("%s is out of .text, skip it.\n", symbol);
 244         else if (kprobe_blacklist__listed(address))
 245                 pr_warning("%s is blacklisted function, skip it.\n", symbol);
 246         else
 247                 return false;
 248 
 249         return true;
 250 }
 251 
 252 /*
 253  * @module can be module name of module file path. In case of path,
 254  * inspect elf and find out what is actual module name.
 255  * Caller has to free mod_name after using it.
 256  */
 257 static char *find_module_name(const char *module)
 258 {
 259         int fd;
 260         Elf *elf;
 261         GElf_Ehdr ehdr;
 262         GElf_Shdr shdr;
 263         Elf_Data *data;
 264         Elf_Scn *sec;
 265         char *mod_name = NULL;
 266         int name_offset;
 267 
 268         fd = open(module, O_RDONLY);
 269         if (fd < 0)
 270                 return NULL;
 271 
 272         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 273         if (elf == NULL)
 274                 goto elf_err;
 275 
 276         if (gelf_getehdr(elf, &ehdr) == NULL)
 277                 goto ret_err;
 278 
 279         sec = elf_section_by_name(elf, &ehdr, &shdr,
 280                         ".gnu.linkonce.this_module", NULL);
 281         if (!sec)
 282                 goto ret_err;
 283 
 284         data = elf_getdata(sec, NULL);
 285         if (!data || !data->d_buf)
 286                 goto ret_err;
 287 
 288         /*
 289          * NOTE:
 290          * '.gnu.linkonce.this_module' section of kernel module elf directly
 291          * maps to 'struct module' from linux/module.h. This section contains
 292          * actual module name which will be used by kernel after loading it.
 293          * But, we cannot use 'struct module' here since linux/module.h is not
 294          * exposed to user-space. Offset of 'name' has remained same from long
 295          * time, so hardcoding it here.
 296          */
 297         if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
 298                 name_offset = 12;
 299         else    /* expect ELFCLASS64 by default */
 300                 name_offset = 24;
 301 
 302         mod_name = strdup((char *)data->d_buf + name_offset);
 303 
 304 ret_err:
 305         elf_end(elf);
 306 elf_err:
 307         close(fd);
 308         return mod_name;
 309 }
 310 
 311 #ifdef HAVE_DWARF_SUPPORT
 312 
 313 static int kernel_get_module_dso(const char *module, struct dso **pdso)
 314 {
 315         struct dso *dso;
 316         struct map *map;
 317         const char *vmlinux_name;
 318         int ret = 0;
 319 
 320         if (module) {
 321                 char module_name[128];
 322 
 323                 snprintf(module_name, sizeof(module_name), "[%s]", module);
 324                 map = map_groups__find_by_name(&host_machine->kmaps, module_name);
 325                 if (map) {
 326                         dso = map->dso;
 327                         goto found;
 328                 }
 329                 pr_debug("Failed to find module %s.\n", module);
 330                 return -ENOENT;
 331         }
 332 
 333         map = machine__kernel_map(host_machine);
 334         dso = map->dso;
 335 
 336         vmlinux_name = symbol_conf.vmlinux_name;
 337         dso->load_errno = 0;
 338         if (vmlinux_name)
 339                 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
 340         else
 341                 ret = dso__load_vmlinux_path(dso, map);
 342 found:
 343         *pdso = dso;
 344         return ret;
 345 }
 346 
 347 /*
 348  * Some binaries like glibc have special symbols which are on the symbol
 349  * table, but not in the debuginfo. If we can find the address of the
 350  * symbol from map, we can translate the address back to the probe point.
 351  */
 352 static int find_alternative_probe_point(struct debuginfo *dinfo,
 353                                         struct perf_probe_point *pp,
 354                                         struct perf_probe_point *result,
 355                                         const char *target, struct nsinfo *nsi,
 356                                         bool uprobes)
 357 {
 358         struct map *map = NULL;
 359         struct symbol *sym;
 360         u64 address = 0;
 361         int ret = -ENOENT;
 362 
 363         /* This can work only for function-name based one */
 364         if (!pp->function || pp->file)
 365                 return -ENOTSUP;
 366 
 367         map = get_target_map(target, nsi, uprobes);
 368         if (!map)
 369                 return -EINVAL;
 370 
 371         /* Find the address of given function */
 372         map__for_each_symbol_by_name(map, pp->function, sym) {
 373                 if (uprobes)
 374                         address = sym->start;
 375                 else
 376                         address = map->unmap_ip(map, sym->start) - map->reloc;
 377                 break;
 378         }
 379         if (!address) {
 380                 ret = -ENOENT;
 381                 goto out;
 382         }
 383         pr_debug("Symbol %s address found : %" PRIx64 "\n",
 384                         pp->function, address);
 385 
 386         ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
 387                                           result);
 388         if (ret <= 0)
 389                 ret = (!ret) ? -ENOENT : ret;
 390         else {
 391                 result->offset += pp->offset;
 392                 result->line += pp->line;
 393                 result->retprobe = pp->retprobe;
 394                 ret = 0;
 395         }
 396 
 397 out:
 398         map__put(map);
 399         return ret;
 400 
 401 }
 402 
 403 static int get_alternative_probe_event(struct debuginfo *dinfo,
 404                                        struct perf_probe_event *pev,
 405                                        struct perf_probe_point *tmp)
 406 {
 407         int ret;
 408 
 409         memcpy(tmp, &pev->point, sizeof(*tmp));
 410         memset(&pev->point, 0, sizeof(pev->point));
 411         ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
 412                                            pev->nsi, pev->uprobes);
 413         if (ret < 0)
 414                 memcpy(&pev->point, tmp, sizeof(*tmp));
 415 
 416         return ret;
 417 }
 418 
 419 static int get_alternative_line_range(struct debuginfo *dinfo,
 420                                       struct line_range *lr,
 421                                       const char *target, bool user)
 422 {
 423         struct perf_probe_point pp = { .function = lr->function,
 424                                        .file = lr->file,
 425                                        .line = lr->start };
 426         struct perf_probe_point result;
 427         int ret, len = 0;
 428 
 429         memset(&result, 0, sizeof(result));
 430 
 431         if (lr->end != INT_MAX)
 432                 len = lr->end - lr->start;
 433         ret = find_alternative_probe_point(dinfo, &pp, &result,
 434                                            target, NULL, user);
 435         if (!ret) {
 436                 lr->function = result.function;
 437                 lr->file = result.file;
 438                 lr->start = result.line;
 439                 if (lr->end != INT_MAX)
 440                         lr->end = lr->start + len;
 441                 clear_perf_probe_point(&pp);
 442         }
 443         return ret;
 444 }
 445 
 446 /* Open new debuginfo of given module */
 447 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
 448                                         bool silent)
 449 {
 450         const char *path = module;
 451         char reason[STRERR_BUFSIZE];
 452         struct debuginfo *ret = NULL;
 453         struct dso *dso = NULL;
 454         struct nscookie nsc;
 455         int err;
 456 
 457         if (!module || !strchr(module, '/')) {
 458                 err = kernel_get_module_dso(module, &dso);
 459                 if (err < 0) {
 460                         if (!dso || dso->load_errno == 0) {
 461                                 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
 462                                         strcpy(reason, "(unknown)");
 463                         } else
 464                                 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
 465                         if (!silent) {
 466                                 if (module)
 467                                         pr_err("Module %s is not loaded, please specify its full path name.\n", module);
 468                                 else
 469                                         pr_err("Failed to find the path for the kernel: %s\n", reason);
 470                         }
 471                         return NULL;
 472                 }
 473                 path = dso->long_name;
 474         }
 475         nsinfo__mountns_enter(nsi, &nsc);
 476         ret = debuginfo__new(path);
 477         if (!ret && !silent) {
 478                 pr_warning("The %s file has no debug information.\n", path);
 479                 if (!module || !strtailcmp(path, ".ko"))
 480                         pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
 481                 else
 482                         pr_warning("Rebuild with -g, ");
 483                 pr_warning("or install an appropriate debuginfo package.\n");
 484         }
 485         nsinfo__mountns_exit(&nsc);
 486         return ret;
 487 }
 488 
 489 /* For caching the last debuginfo */
 490 static struct debuginfo *debuginfo_cache;
 491 static char *debuginfo_cache_path;
 492 
 493 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
 494 {
 495         const char *path = module;
 496 
 497         /* If the module is NULL, it should be the kernel. */
 498         if (!module)
 499                 path = "kernel";
 500 
 501         if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
 502                 goto out;
 503 
 504         /* Copy module path */
 505         free(debuginfo_cache_path);
 506         debuginfo_cache_path = strdup(path);
 507         if (!debuginfo_cache_path) {
 508                 debuginfo__delete(debuginfo_cache);
 509                 debuginfo_cache = NULL;
 510                 goto out;
 511         }
 512 
 513         debuginfo_cache = open_debuginfo(module, NULL, silent);
 514         if (!debuginfo_cache)
 515                 zfree(&debuginfo_cache_path);
 516 out:
 517         return debuginfo_cache;
 518 }
 519 
 520 static void debuginfo_cache__exit(void)
 521 {
 522         debuginfo__delete(debuginfo_cache);
 523         debuginfo_cache = NULL;
 524         zfree(&debuginfo_cache_path);
 525 }
 526 
 527 
 528 static int get_text_start_address(const char *exec, unsigned long *address,
 529                                   struct nsinfo *nsi)
 530 {
 531         Elf *elf;
 532         GElf_Ehdr ehdr;
 533         GElf_Shdr shdr;
 534         int fd, ret = -ENOENT;
 535         struct nscookie nsc;
 536 
 537         nsinfo__mountns_enter(nsi, &nsc);
 538         fd = open(exec, O_RDONLY);
 539         nsinfo__mountns_exit(&nsc);
 540         if (fd < 0)
 541                 return -errno;
 542 
 543         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
 544         if (elf == NULL) {
 545                 ret = -EINVAL;
 546                 goto out_close;
 547         }
 548 
 549         if (gelf_getehdr(elf, &ehdr) == NULL)
 550                 goto out;
 551 
 552         if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
 553                 goto out;
 554 
 555         *address = shdr.sh_addr - shdr.sh_offset;
 556         ret = 0;
 557 out:
 558         elf_end(elf);
 559 out_close:
 560         close(fd);
 561 
 562         return ret;
 563 }
 564 
 565 /*
 566  * Convert trace point to probe point with debuginfo
 567  */
 568 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
 569                                             struct perf_probe_point *pp,
 570                                             bool is_kprobe)
 571 {
 572         struct debuginfo *dinfo = NULL;
 573         unsigned long stext = 0;
 574         u64 addr = tp->address;
 575         int ret = -ENOENT;
 576 
 577         /* convert the address to dwarf address */
 578         if (!is_kprobe) {
 579                 if (!addr) {
 580                         ret = -EINVAL;
 581                         goto error;
 582                 }
 583                 ret = get_text_start_address(tp->module, &stext, NULL);
 584                 if (ret < 0)
 585                         goto error;
 586                 addr += stext;
 587         } else if (tp->symbol) {
 588                 /* If the module is given, this returns relative address */
 589                 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
 590                                                         false, !!tp->module);
 591                 if (ret != 0)
 592                         goto error;
 593                 addr += tp->offset;
 594         }
 595 
 596         pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
 597                  tp->module ? : "kernel");
 598 
 599         dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
 600         if (dinfo)
 601                 ret = debuginfo__find_probe_point(dinfo,
 602                                                  (unsigned long)addr, pp);
 603         else
 604                 ret = -ENOENT;
 605 
 606         if (ret > 0) {
 607                 pp->retprobe = tp->retprobe;
 608                 return 0;
 609         }
 610 error:
 611         pr_debug("Failed to find corresponding probes from debuginfo.\n");
 612         return ret ? : -ENOENT;
 613 }
 614 
 615 /* Adjust symbol name and address */
 616 static int post_process_probe_trace_point(struct probe_trace_point *tp,
 617                                            struct map *map, unsigned long offs)
 618 {
 619         struct symbol *sym;
 620         u64 addr = tp->address - offs;
 621 
 622         sym = map__find_symbol(map, addr);
 623         if (!sym)
 624                 return -ENOENT;
 625 
 626         if (strcmp(sym->name, tp->symbol)) {
 627                 /* If we have no realname, use symbol for it */
 628                 if (!tp->realname)
 629                         tp->realname = tp->symbol;
 630                 else
 631                         free(tp->symbol);
 632                 tp->symbol = strdup(sym->name);
 633                 if (!tp->symbol)
 634                         return -ENOMEM;
 635         }
 636         tp->offset = addr - sym->start;
 637         tp->address -= offs;
 638 
 639         return 0;
 640 }
 641 
 642 /*
 643  * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
 644  * and generate new symbols with suffixes such as .constprop.N or .isra.N
 645  * etc. Since those symbols are not recorded in DWARF, we have to find
 646  * correct generated symbols from offline ELF binary.
 647  * For online kernel or uprobes we don't need this because those are
 648  * rebased on _text, or already a section relative address.
 649  */
 650 static int
 651 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
 652                                         int ntevs, const char *pathname)
 653 {
 654         struct map *map;
 655         unsigned long stext = 0;
 656         int i, ret = 0;
 657 
 658         /* Prepare a map for offline binary */
 659         map = dso__new_map(pathname);
 660         if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
 661                 pr_warning("Failed to get ELF symbols for %s\n", pathname);
 662                 return -EINVAL;
 663         }
 664 
 665         for (i = 0; i < ntevs; i++) {
 666                 ret = post_process_probe_trace_point(&tevs[i].point,
 667                                                      map, stext);
 668                 if (ret < 0)
 669                         break;
 670         }
 671         map__put(map);
 672 
 673         return ret;
 674 }
 675 
 676 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
 677                                           int ntevs, const char *exec,
 678                                           struct nsinfo *nsi)
 679 {
 680         int i, ret = 0;
 681         unsigned long stext = 0;
 682 
 683         if (!exec)
 684                 return 0;
 685 
 686         ret = get_text_start_address(exec, &stext, nsi);
 687         if (ret < 0)
 688                 return ret;
 689 
 690         for (i = 0; i < ntevs && ret >= 0; i++) {
 691                 /* point.address is the address of point.symbol + point.offset */
 692                 tevs[i].point.address -= stext;
 693                 tevs[i].point.module = strdup(exec);
 694                 if (!tevs[i].point.module) {
 695                         ret = -ENOMEM;
 696                         break;
 697                 }
 698                 tevs[i].uprobes = true;
 699         }
 700 
 701         return ret;
 702 }
 703 
 704 static int
 705 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
 706                                        int ntevs, const char *module,
 707                                        struct debuginfo *dinfo)
 708 {
 709         Dwarf_Addr text_offs = 0;
 710         int i, ret = 0;
 711         char *mod_name = NULL;
 712         struct map *map;
 713 
 714         if (!module)
 715                 return 0;
 716 
 717         map = get_target_map(module, NULL, false);
 718         if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
 719                 pr_warning("Failed to get ELF symbols for %s\n", module);
 720                 return -EINVAL;
 721         }
 722 
 723         mod_name = find_module_name(module);
 724         for (i = 0; i < ntevs; i++) {
 725                 ret = post_process_probe_trace_point(&tevs[i].point,
 726                                                 map, (unsigned long)text_offs);
 727                 if (ret < 0)
 728                         break;
 729                 tevs[i].point.module =
 730                         strdup(mod_name ? mod_name : module);
 731                 if (!tevs[i].point.module) {
 732                         ret = -ENOMEM;
 733                         break;
 734                 }
 735         }
 736 
 737         free(mod_name);
 738         map__put(map);
 739 
 740         return ret;
 741 }
 742 
 743 static int
 744 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
 745                                        int ntevs)
 746 {
 747         struct ref_reloc_sym *reloc_sym;
 748         char *tmp;
 749         int i, skipped = 0;
 750 
 751         /* Skip post process if the target is an offline kernel */
 752         if (symbol_conf.ignore_vmlinux_buildid)
 753                 return post_process_offline_probe_trace_events(tevs, ntevs,
 754                                                 symbol_conf.vmlinux_name);
 755 
 756         reloc_sym = kernel_get_ref_reloc_sym();
 757         if (!reloc_sym) {
 758                 pr_warning("Relocated base symbol is not found!\n");
 759                 return -EINVAL;
 760         }
 761 
 762         for (i = 0; i < ntevs; i++) {
 763                 if (!tevs[i].point.address)
 764                         continue;
 765                 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
 766                         continue;
 767                 /* If we found a wrong one, mark it by NULL symbol */
 768                 if (kprobe_warn_out_range(tevs[i].point.symbol,
 769                                           tevs[i].point.address)) {
 770                         tmp = NULL;
 771                         skipped++;
 772                 } else {
 773                         tmp = strdup(reloc_sym->name);
 774                         if (!tmp)
 775                                 return -ENOMEM;
 776                 }
 777                 /* If we have no realname, use symbol for it */
 778                 if (!tevs[i].point.realname)
 779                         tevs[i].point.realname = tevs[i].point.symbol;
 780                 else
 781                         free(tevs[i].point.symbol);
 782                 tevs[i].point.symbol = tmp;
 783                 tevs[i].point.offset = tevs[i].point.address -
 784                                        reloc_sym->unrelocated_addr;
 785         }
 786         return skipped;
 787 }
 788 
 789 void __weak
 790 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
 791                                       int ntevs __maybe_unused)
 792 {
 793 }
 794 
 795 /* Post processing the probe events */
 796 static int post_process_probe_trace_events(struct perf_probe_event *pev,
 797                                            struct probe_trace_event *tevs,
 798                                            int ntevs, const char *module,
 799                                            bool uprobe, struct debuginfo *dinfo)
 800 {
 801         int ret;
 802 
 803         if (uprobe)
 804                 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
 805                                                      pev->nsi);
 806         else if (module)
 807                 /* Currently ref_reloc_sym based probe is not for drivers */
 808                 ret = post_process_module_probe_trace_events(tevs, ntevs,
 809                                                              module, dinfo);
 810         else
 811                 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
 812 
 813         if (ret >= 0)
 814                 arch__post_process_probe_trace_events(pev, ntevs);
 815 
 816         return ret;
 817 }
 818 
 819 /* Try to find perf_probe_event with debuginfo */
 820 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 821                                           struct probe_trace_event **tevs)
 822 {
 823         bool need_dwarf = perf_probe_event_need_dwarf(pev);
 824         struct perf_probe_point tmp;
 825         struct debuginfo *dinfo;
 826         int ntevs, ret = 0;
 827 
 828         dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
 829         if (!dinfo) {
 830                 if (need_dwarf)
 831                         return -ENOENT;
 832                 pr_debug("Could not open debuginfo. Try to use symbols.\n");
 833                 return 0;
 834         }
 835 
 836         pr_debug("Try to find probe point from debuginfo.\n");
 837         /* Searching trace events corresponding to a probe event */
 838         ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
 839 
 840         if (ntevs == 0) {  /* Not found, retry with an alternative */
 841                 ret = get_alternative_probe_event(dinfo, pev, &tmp);
 842                 if (!ret) {
 843                         ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
 844                         /*
 845                          * Write back to the original probe_event for
 846                          * setting appropriate (user given) event name
 847                          */
 848                         clear_perf_probe_point(&pev->point);
 849                         memcpy(&pev->point, &tmp, sizeof(tmp));
 850                 }
 851         }
 852 
 853         if (ntevs > 0) {        /* Succeeded to find trace events */
 854                 pr_debug("Found %d probe_trace_events.\n", ntevs);
 855                 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
 856                                         pev->target, pev->uprobes, dinfo);
 857                 if (ret < 0 || ret == ntevs) {
 858                         pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
 859                         clear_probe_trace_events(*tevs, ntevs);
 860                         zfree(tevs);
 861                         ntevs = 0;
 862                 }
 863         }
 864 
 865         debuginfo__delete(dinfo);
 866 
 867         if (ntevs == 0) {       /* No error but failed to find probe point. */
 868                 pr_warning("Probe point '%s' not found.\n",
 869                            synthesize_perf_probe_point(&pev->point));
 870                 return -ENOENT;
 871         } else if (ntevs < 0) {
 872                 /* Error path : ntevs < 0 */
 873                 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
 874                 if (ntevs == -EBADF)
 875                         pr_warning("Warning: No dwarf info found in the vmlinux - "
 876                                 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
 877                 if (!need_dwarf) {
 878                         pr_debug("Trying to use symbols.\n");
 879                         return 0;
 880                 }
 881         }
 882         return ntevs;
 883 }
 884 
 885 #define LINEBUF_SIZE 256
 886 #define NR_ADDITIONAL_LINES 2
 887 
 888 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
 889 {
 890         char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
 891         const char *color = show_num ? "" : PERF_COLOR_BLUE;
 892         const char *prefix = NULL;
 893 
 894         do {
 895                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 896                         goto error;
 897                 if (skip)
 898                         continue;
 899                 if (!prefix) {
 900                         prefix = show_num ? "%7d  " : "         ";
 901                         color_fprintf(stdout, color, prefix, l);
 902                 }
 903                 color_fprintf(stdout, color, "%s", buf);
 904 
 905         } while (strchr(buf, '\n') == NULL);
 906 
 907         return 1;
 908 error:
 909         if (ferror(fp)) {
 910                 pr_warning("File read error: %s\n",
 911                            str_error_r(errno, sbuf, sizeof(sbuf)));
 912                 return -1;
 913         }
 914         return 0;
 915 }
 916 
 917 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
 918 {
 919         int rv = __show_one_line(fp, l, skip, show_num);
 920         if (rv == 0) {
 921                 pr_warning("Source file is shorter than expected.\n");
 922                 rv = -1;
 923         }
 924         return rv;
 925 }
 926 
 927 #define show_one_line_with_num(f,l)     _show_one_line(f,l,false,true)
 928 #define show_one_line(f,l)              _show_one_line(f,l,false,false)
 929 #define skip_one_line(f,l)              _show_one_line(f,l,true,false)
 930 #define show_one_line_or_eof(f,l)       __show_one_line(f,l,false,false)
 931 
 932 /*
 933  * Show line-range always requires debuginfo to find source file and
 934  * line number.
 935  */
 936 static int __show_line_range(struct line_range *lr, const char *module,
 937                              bool user)
 938 {
 939         int l = 1;
 940         struct int_node *ln;
 941         struct debuginfo *dinfo;
 942         FILE *fp;
 943         int ret;
 944         char *tmp;
 945         char sbuf[STRERR_BUFSIZE];
 946 
 947         /* Search a line range */
 948         dinfo = open_debuginfo(module, NULL, false);
 949         if (!dinfo)
 950                 return -ENOENT;
 951 
 952         ret = debuginfo__find_line_range(dinfo, lr);
 953         if (!ret) {     /* Not found, retry with an alternative */
 954                 ret = get_alternative_line_range(dinfo, lr, module, user);
 955                 if (!ret)
 956                         ret = debuginfo__find_line_range(dinfo, lr);
 957         }
 958         debuginfo__delete(dinfo);
 959         if (ret == 0 || ret == -ENOENT) {
 960                 pr_warning("Specified source line is not found.\n");
 961                 return -ENOENT;
 962         } else if (ret < 0) {
 963                 pr_warning("Debuginfo analysis failed.\n");
 964                 return ret;
 965         }
 966 
 967         /* Convert source file path */
 968         tmp = lr->path;
 969         ret = get_real_path(tmp, lr->comp_dir, &lr->path);
 970 
 971         /* Free old path when new path is assigned */
 972         if (tmp != lr->path)
 973                 free(tmp);
 974 
 975         if (ret < 0) {
 976                 pr_warning("Failed to find source file path.\n");
 977                 return ret;
 978         }
 979 
 980         setup_pager();
 981 
 982         if (lr->function)
 983                 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
 984                         lr->start - lr->offset);
 985         else
 986                 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
 987 
 988         fp = fopen(lr->path, "r");
 989         if (fp == NULL) {
 990                 pr_warning("Failed to open %s: %s\n", lr->path,
 991                            str_error_r(errno, sbuf, sizeof(sbuf)));
 992                 return -errno;
 993         }
 994         /* Skip to starting line number */
 995         while (l < lr->start) {
 996                 ret = skip_one_line(fp, l++);
 997                 if (ret < 0)
 998                         goto end;
 999         }
1000 
1001         intlist__for_each_entry(ln, lr->line_list) {
1002                 for (; ln->i > l; l++) {
1003                         ret = show_one_line(fp, l - lr->offset);
1004                         if (ret < 0)
1005                                 goto end;
1006                 }
1007                 ret = show_one_line_with_num(fp, l++ - lr->offset);
1008                 if (ret < 0)
1009                         goto end;
1010         }
1011 
1012         if (lr->end == INT_MAX)
1013                 lr->end = l + NR_ADDITIONAL_LINES;
1014         while (l <= lr->end) {
1015                 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1016                 if (ret <= 0)
1017                         break;
1018         }
1019 end:
1020         fclose(fp);
1021         return ret;
1022 }
1023 
1024 int show_line_range(struct line_range *lr, const char *module,
1025                     struct nsinfo *nsi, bool user)
1026 {
1027         int ret;
1028         struct nscookie nsc;
1029 
1030         ret = init_probe_symbol_maps(user);
1031         if (ret < 0)
1032                 return ret;
1033         nsinfo__mountns_enter(nsi, &nsc);
1034         ret = __show_line_range(lr, module, user);
1035         nsinfo__mountns_exit(&nsc);
1036         exit_probe_symbol_maps();
1037 
1038         return ret;
1039 }
1040 
1041 static int show_available_vars_at(struct debuginfo *dinfo,
1042                                   struct perf_probe_event *pev,
1043                                   struct strfilter *_filter)
1044 {
1045         char *buf;
1046         int ret, i, nvars;
1047         struct str_node *node;
1048         struct variable_list *vls = NULL, *vl;
1049         struct perf_probe_point tmp;
1050         const char *var;
1051 
1052         buf = synthesize_perf_probe_point(&pev->point);
1053         if (!buf)
1054                 return -EINVAL;
1055         pr_debug("Searching variables at %s\n", buf);
1056 
1057         ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1058         if (!ret) {  /* Not found, retry with an alternative */
1059                 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1060                 if (!ret) {
1061                         ret = debuginfo__find_available_vars_at(dinfo, pev,
1062                                                                 &vls);
1063                         /* Release the old probe_point */
1064                         clear_perf_probe_point(&tmp);
1065                 }
1066         }
1067         if (ret <= 0) {
1068                 if (ret == 0 || ret == -ENOENT) {
1069                         pr_err("Failed to find the address of %s\n", buf);
1070                         ret = -ENOENT;
1071                 } else
1072                         pr_warning("Debuginfo analysis failed.\n");
1073                 goto end;
1074         }
1075 
1076         /* Some variables are found */
1077         fprintf(stdout, "Available variables at %s\n", buf);
1078         for (i = 0; i < ret; i++) {
1079                 vl = &vls[i];
1080                 /*
1081                  * A probe point might be converted to
1082                  * several trace points.
1083                  */
1084                 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1085                         vl->point.offset);
1086                 zfree(&vl->point.symbol);
1087                 nvars = 0;
1088                 if (vl->vars) {
1089                         strlist__for_each_entry(node, vl->vars) {
1090                                 var = strchr(node->s, '\t') + 1;
1091                                 if (strfilter__compare(_filter, var)) {
1092                                         fprintf(stdout, "\t\t%s\n", node->s);
1093                                         nvars++;
1094                                 }
1095                         }
1096                         strlist__delete(vl->vars);
1097                 }
1098                 if (nvars == 0)
1099                         fprintf(stdout, "\t\t(No matched variables)\n");
1100         }
1101         free(vls);
1102 end:
1103         free(buf);
1104         return ret;
1105 }
1106 
1107 /* Show available variables on given probe point */
1108 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1109                         struct strfilter *_filter)
1110 {
1111         int i, ret = 0;
1112         struct debuginfo *dinfo;
1113 
1114         ret = init_probe_symbol_maps(pevs->uprobes);
1115         if (ret < 0)
1116                 return ret;
1117 
1118         dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1119         if (!dinfo) {
1120                 ret = -ENOENT;
1121                 goto out;
1122         }
1123 
1124         setup_pager();
1125 
1126         for (i = 0; i < npevs && ret >= 0; i++)
1127                 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1128 
1129         debuginfo__delete(dinfo);
1130 out:
1131         exit_probe_symbol_maps();
1132         return ret;
1133 }
1134 
1135 #else   /* !HAVE_DWARF_SUPPORT */
1136 
1137 static void debuginfo_cache__exit(void)
1138 {
1139 }
1140 
1141 static int
1142 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1143                                  struct perf_probe_point *pp __maybe_unused,
1144                                  bool is_kprobe __maybe_unused)
1145 {
1146         return -ENOSYS;
1147 }
1148 
1149 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1150                                 struct probe_trace_event **tevs __maybe_unused)
1151 {
1152         if (perf_probe_event_need_dwarf(pev)) {
1153                 pr_warning("Debuginfo-analysis is not supported.\n");
1154                 return -ENOSYS;
1155         }
1156 
1157         return 0;
1158 }
1159 
1160 int show_line_range(struct line_range *lr __maybe_unused,
1161                     const char *module __maybe_unused,
1162                     struct nsinfo *nsi __maybe_unused,
1163                     bool user __maybe_unused)
1164 {
1165         pr_warning("Debuginfo-analysis is not supported.\n");
1166         return -ENOSYS;
1167 }
1168 
1169 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1170                         int npevs __maybe_unused,
1171                         struct strfilter *filter __maybe_unused)
1172 {
1173         pr_warning("Debuginfo-analysis is not supported.\n");
1174         return -ENOSYS;
1175 }
1176 #endif
1177 
1178 void line_range__clear(struct line_range *lr)
1179 {
1180         zfree(&lr->function);
1181         zfree(&lr->file);
1182         zfree(&lr->path);
1183         zfree(&lr->comp_dir);
1184         intlist__delete(lr->line_list);
1185 }
1186 
1187 int line_range__init(struct line_range *lr)
1188 {
1189         memset(lr, 0, sizeof(*lr));
1190         lr->line_list = intlist__new(NULL);
1191         if (!lr->line_list)
1192                 return -ENOMEM;
1193         else
1194                 return 0;
1195 }
1196 
1197 static int parse_line_num(char **ptr, int *val, const char *what)
1198 {
1199         const char *start = *ptr;
1200 
1201         errno = 0;
1202         *val = strtol(*ptr, ptr, 0);
1203         if (errno || *ptr == start) {
1204                 semantic_error("'%s' is not a valid number.\n", what);
1205                 return -EINVAL;
1206         }
1207         return 0;
1208 }
1209 
1210 /* Check the name is good for event, group or function */
1211 static bool is_c_func_name(const char *name)
1212 {
1213         if (!isalpha(*name) && *name != '_')
1214                 return false;
1215         while (*++name != '\0') {
1216                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1217                         return false;
1218         }
1219         return true;
1220 }
1221 
1222 /*
1223  * Stuff 'lr' according to the line range described by 'arg'.
1224  * The line range syntax is described by:
1225  *
1226  *         SRC[:SLN[+NUM|-ELN]]
1227  *         FNC[@SRC][:SLN[+NUM|-ELN]]
1228  */
1229 int parse_line_range_desc(const char *arg, struct line_range *lr)
1230 {
1231         char *range, *file, *name = strdup(arg);
1232         int err;
1233 
1234         if (!name)
1235                 return -ENOMEM;
1236 
1237         lr->start = 0;
1238         lr->end = INT_MAX;
1239 
1240         range = strchr(name, ':');
1241         if (range) {
1242                 *range++ = '\0';
1243 
1244                 err = parse_line_num(&range, &lr->start, "start line");
1245                 if (err)
1246                         goto err;
1247 
1248                 if (*range == '+' || *range == '-') {
1249                         const char c = *range++;
1250 
1251                         err = parse_line_num(&range, &lr->end, "end line");
1252                         if (err)
1253                                 goto err;
1254 
1255                         if (c == '+') {
1256                                 lr->end += lr->start;
1257                                 /*
1258                                  * Adjust the number of lines here.
1259                                  * If the number of lines == 1, the
1260                                  * the end of line should be equal to
1261                                  * the start of line.
1262                                  */
1263                                 lr->end--;
1264                         }
1265                 }
1266 
1267                 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1268 
1269                 err = -EINVAL;
1270                 if (lr->start > lr->end) {
1271                         semantic_error("Start line must be smaller"
1272                                        " than end line.\n");
1273                         goto err;
1274                 }
1275                 if (*range != '\0') {
1276                         semantic_error("Tailing with invalid str '%s'.\n", range);
1277                         goto err;
1278                 }
1279         }
1280 
1281         file = strchr(name, '@');
1282         if (file) {
1283                 *file = '\0';
1284                 lr->file = strdup(++file);
1285                 if (lr->file == NULL) {
1286                         err = -ENOMEM;
1287                         goto err;
1288                 }
1289                 lr->function = name;
1290         } else if (strchr(name, '/') || strchr(name, '.'))
1291                 lr->file = name;
1292         else if (is_c_func_name(name))/* We reuse it for checking funcname */
1293                 lr->function = name;
1294         else {  /* Invalid name */
1295                 semantic_error("'%s' is not a valid function name.\n", name);
1296                 err = -EINVAL;
1297                 goto err;
1298         }
1299 
1300         return 0;
1301 err:
1302         free(name);
1303         return err;
1304 }
1305 
1306 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1307 {
1308         char *ptr;
1309 
1310         ptr = strpbrk_esc(*arg, ":");
1311         if (ptr) {
1312                 *ptr = '\0';
1313                 if (!pev->sdt && !is_c_func_name(*arg))
1314                         goto ng_name;
1315                 pev->group = strdup_esc(*arg);
1316                 if (!pev->group)
1317                         return -ENOMEM;
1318                 *arg = ptr + 1;
1319         } else
1320                 pev->group = NULL;
1321 
1322         pev->event = strdup_esc(*arg);
1323         if (pev->event == NULL)
1324                 return -ENOMEM;
1325 
1326         if (!pev->sdt && !is_c_func_name(pev->event)) {
1327                 zfree(&pev->event);
1328 ng_name:
1329                 zfree(&pev->group);
1330                 semantic_error("%s is bad for event name -it must "
1331                                "follow C symbol-naming rule.\n", *arg);
1332                 return -EINVAL;
1333         }
1334         return 0;
1335 }
1336 
1337 /* Parse probepoint definition. */
1338 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1339 {
1340         struct perf_probe_point *pp = &pev->point;
1341         char *ptr, *tmp;
1342         char c, nc = 0;
1343         bool file_spec = false;
1344         int ret;
1345 
1346         /*
1347          * <Syntax>
1348          * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1349          * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1350          * perf probe %[GRP:]SDT_EVENT
1351          */
1352         if (!arg)
1353                 return -EINVAL;
1354 
1355         if (is_sdt_event(arg)) {
1356                 pev->sdt = true;
1357                 if (arg[0] == '%')
1358                         arg++;
1359         }
1360 
1361         ptr = strpbrk_esc(arg, ";=@+%");
1362         if (pev->sdt) {
1363                 if (ptr) {
1364                         if (*ptr != '@') {
1365                                 semantic_error("%s must be an SDT name.\n",
1366                                                arg);
1367                                 return -EINVAL;
1368                         }
1369                         /* This must be a target file name or build id */
1370                         tmp = build_id_cache__complement(ptr + 1);
1371                         if (tmp) {
1372                                 pev->target = build_id_cache__origname(tmp);
1373                                 free(tmp);
1374                         } else
1375                                 pev->target = strdup_esc(ptr + 1);
1376                         if (!pev->target)
1377                                 return -ENOMEM;
1378                         *ptr = '\0';
1379                 }
1380                 ret = parse_perf_probe_event_name(&arg, pev);
1381                 if (ret == 0) {
1382                         if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1383                                 ret = -errno;
1384                 }
1385                 return ret;
1386         }
1387 
1388         if (ptr && *ptr == '=') {       /* Event name */
1389                 *ptr = '\0';
1390                 tmp = ptr + 1;
1391                 ret = parse_perf_probe_event_name(&arg, pev);
1392                 if (ret < 0)
1393                         return ret;
1394 
1395                 arg = tmp;
1396         }
1397 
1398         /*
1399          * Check arg is function or file name and copy it.
1400          *
1401          * We consider arg to be a file spec if and only if it satisfies
1402          * all of the below criteria::
1403          * - it does not include any of "+@%",
1404          * - it includes one of ":;", and
1405          * - it has a period '.' in the name.
1406          *
1407          * Otherwise, we consider arg to be a function specification.
1408          */
1409         if (!strpbrk_esc(arg, "+@%")) {
1410                 ptr = strpbrk_esc(arg, ";:");
1411                 /* This is a file spec if it includes a '.' before ; or : */
1412                 if (ptr && memchr(arg, '.', ptr - arg))
1413                         file_spec = true;
1414         }
1415 
1416         ptr = strpbrk_esc(arg, ";:+@%");
1417         if (ptr) {
1418                 nc = *ptr;
1419                 *ptr++ = '\0';
1420         }
1421 
1422         if (arg[0] == '\0')
1423                 tmp = NULL;
1424         else {
1425                 tmp = strdup_esc(arg);
1426                 if (tmp == NULL)
1427                         return -ENOMEM;
1428         }
1429 
1430         if (file_spec)
1431                 pp->file = tmp;
1432         else {
1433                 pp->function = tmp;
1434 
1435                 /*
1436                  * Keep pp->function even if this is absolute address,
1437                  * so it can mark whether abs_address is valid.
1438                  * Which make 'perf probe lib.bin 0x0' possible.
1439                  *
1440                  * Note that checking length of tmp is not needed
1441                  * because when we access tmp[1] we know tmp[0] is '0',
1442                  * so tmp[1] should always valid (but could be '\0').
1443                  */
1444                 if (tmp && !strncmp(tmp, "0x", 2)) {
1445                         pp->abs_address = strtoul(pp->function, &tmp, 0);
1446                         if (*tmp != '\0') {
1447                                 semantic_error("Invalid absolute address.\n");
1448                                 return -EINVAL;
1449                         }
1450                 }
1451         }
1452 
1453         /* Parse other options */
1454         while (ptr) {
1455                 arg = ptr;
1456                 c = nc;
1457                 if (c == ';') { /* Lazy pattern must be the last part */
1458                         pp->lazy_line = strdup(arg); /* let leave escapes */
1459                         if (pp->lazy_line == NULL)
1460                                 return -ENOMEM;
1461                         break;
1462                 }
1463                 ptr = strpbrk_esc(arg, ";:+@%");
1464                 if (ptr) {
1465                         nc = *ptr;
1466                         *ptr++ = '\0';
1467                 }
1468                 switch (c) {
1469                 case ':':       /* Line number */
1470                         pp->line = strtoul(arg, &tmp, 0);
1471                         if (*tmp != '\0') {
1472                                 semantic_error("There is non-digit char"
1473                                                " in line number.\n");
1474                                 return -EINVAL;
1475                         }
1476                         break;
1477                 case '+':       /* Byte offset from a symbol */
1478                         pp->offset = strtoul(arg, &tmp, 0);
1479                         if (*tmp != '\0') {
1480                                 semantic_error("There is non-digit character"
1481                                                 " in offset.\n");
1482                                 return -EINVAL;
1483                         }
1484                         break;
1485                 case '@':       /* File name */
1486                         if (pp->file) {
1487                                 semantic_error("SRC@SRC is not allowed.\n");
1488                                 return -EINVAL;
1489                         }
1490                         pp->file = strdup_esc(arg);
1491                         if (pp->file == NULL)
1492                                 return -ENOMEM;
1493                         break;
1494                 case '%':       /* Probe places */
1495                         if (strcmp(arg, "return") == 0) {
1496                                 pp->retprobe = 1;
1497                         } else {        /* Others not supported yet */
1498                                 semantic_error("%%%s is not supported.\n", arg);
1499                                 return -ENOTSUP;
1500                         }
1501                         break;
1502                 default:        /* Buggy case */
1503                         pr_err("This program has a bug at %s:%d.\n",
1504                                 __FILE__, __LINE__);
1505                         return -ENOTSUP;
1506                         break;
1507                 }
1508         }
1509 
1510         /* Exclusion check */
1511         if (pp->lazy_line && pp->line) {
1512                 semantic_error("Lazy pattern can't be used with"
1513                                " line number.\n");
1514                 return -EINVAL;
1515         }
1516 
1517         if (pp->lazy_line && pp->offset) {
1518                 semantic_error("Lazy pattern can't be used with offset.\n");
1519                 return -EINVAL;
1520         }
1521 
1522         if (pp->line && pp->offset) {
1523                 semantic_error("Offset can't be used with line number.\n");
1524                 return -EINVAL;
1525         }
1526 
1527         if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1528                 semantic_error("File always requires line number or "
1529                                "lazy pattern.\n");
1530                 return -EINVAL;
1531         }
1532 
1533         if (pp->offset && !pp->function) {
1534                 semantic_error("Offset requires an entry function.\n");
1535                 return -EINVAL;
1536         }
1537 
1538         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1539                 semantic_error("Offset/Line/Lazy pattern can't be used with "
1540                                "return probe.\n");
1541                 return -EINVAL;
1542         }
1543 
1544         pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1545                  pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1546                  pp->lazy_line);
1547         return 0;
1548 }
1549 
1550 /* Parse perf-probe event argument */
1551 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1552 {
1553         char *tmp, *goodname;
1554         struct perf_probe_arg_field **fieldp;
1555 
1556         pr_debug("parsing arg: %s into ", str);
1557 
1558         tmp = strchr(str, '=');
1559         if (tmp) {
1560                 arg->name = strndup(str, tmp - str);
1561                 if (arg->name == NULL)
1562                         return -ENOMEM;
1563                 pr_debug("name:%s ", arg->name);
1564                 str = tmp + 1;
1565         }
1566 
1567         tmp = strchr(str, '@');
1568         if (tmp && tmp != str && strcmp(tmp + 1, "user")) { /* user attr */
1569                 if (!user_access_is_supported()) {
1570                         semantic_error("ftrace does not support user access\n");
1571                         return -EINVAL;
1572                 }
1573                 *tmp = '\0';
1574                 arg->user_access = true;
1575                 pr_debug("user_access ");
1576         }
1577 
1578         tmp = strchr(str, ':');
1579         if (tmp) {      /* Type setting */
1580                 *tmp = '\0';
1581                 arg->type = strdup(tmp + 1);
1582                 if (arg->type == NULL)
1583                         return -ENOMEM;
1584                 pr_debug("type:%s ", arg->type);
1585         }
1586 
1587         tmp = strpbrk(str, "-.[");
1588         if (!is_c_varname(str) || !tmp) {
1589                 /* A variable, register, symbol or special value */
1590                 arg->var = strdup(str);
1591                 if (arg->var == NULL)
1592                         return -ENOMEM;
1593                 pr_debug("%s\n", arg->var);
1594                 return 0;
1595         }
1596 
1597         /* Structure fields or array element */
1598         arg->var = strndup(str, tmp - str);
1599         if (arg->var == NULL)
1600                 return -ENOMEM;
1601         goodname = arg->var;
1602         pr_debug("%s, ", arg->var);
1603         fieldp = &arg->field;
1604 
1605         do {
1606                 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1607                 if (*fieldp == NULL)
1608                         return -ENOMEM;
1609                 if (*tmp == '[') {      /* Array */
1610                         str = tmp;
1611                         (*fieldp)->index = strtol(str + 1, &tmp, 0);
1612                         (*fieldp)->ref = true;
1613                         if (*tmp != ']' || tmp == str + 1) {
1614                                 semantic_error("Array index must be a"
1615                                                 " number.\n");
1616                                 return -EINVAL;
1617                         }
1618                         tmp++;
1619                         if (*tmp == '\0')
1620                                 tmp = NULL;
1621                 } else {                /* Structure */
1622                         if (*tmp == '.') {
1623                                 str = tmp + 1;
1624                                 (*fieldp)->ref = false;
1625                         } else if (tmp[1] == '>') {
1626                                 str = tmp + 2;
1627                                 (*fieldp)->ref = true;
1628                         } else {
1629                                 semantic_error("Argument parse error: %s\n",
1630                                                str);
1631                                 return -EINVAL;
1632                         }
1633                         tmp = strpbrk(str, "-.[");
1634                 }
1635                 if (tmp) {
1636                         (*fieldp)->name = strndup(str, tmp - str);
1637                         if ((*fieldp)->name == NULL)
1638                                 return -ENOMEM;
1639                         if (*str != '[')
1640                                 goodname = (*fieldp)->name;
1641                         pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1642                         fieldp = &(*fieldp)->next;
1643                 }
1644         } while (tmp);
1645         (*fieldp)->name = strdup(str);
1646         if ((*fieldp)->name == NULL)
1647                 return -ENOMEM;
1648         if (*str != '[')
1649                 goodname = (*fieldp)->name;
1650         pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1651 
1652         /* If no name is specified, set the last field name (not array index)*/
1653         if (!arg->name) {
1654                 arg->name = strdup(goodname);
1655                 if (arg->name == NULL)
1656                         return -ENOMEM;
1657         }
1658         return 0;
1659 }
1660 
1661 /* Parse perf-probe event command */
1662 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1663 {
1664         char **argv;
1665         int argc, i, ret = 0;
1666 
1667         argv = argv_split(cmd, &argc);
1668         if (!argv) {
1669                 pr_debug("Failed to split arguments.\n");
1670                 return -ENOMEM;
1671         }
1672         if (argc - 1 > MAX_PROBE_ARGS) {
1673                 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1674                 ret = -ERANGE;
1675                 goto out;
1676         }
1677         /* Parse probe point */
1678         ret = parse_perf_probe_point(argv[0], pev);
1679         if (ret < 0)
1680                 goto out;
1681 
1682         /* Copy arguments and ensure return probe has no C argument */
1683         pev->nargs = argc - 1;
1684         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1685         if (pev->args == NULL) {
1686                 ret = -ENOMEM;
1687                 goto out;
1688         }
1689         for (i = 0; i < pev->nargs && ret >= 0; i++) {
1690                 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1691                 if (ret >= 0 &&
1692                     is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1693                         semantic_error("You can't specify local variable for"
1694                                        " kretprobe.\n");
1695                         ret = -EINVAL;
1696                 }
1697         }
1698 out:
1699         argv_free(argv);
1700 
1701         return ret;
1702 }
1703 
1704 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1705 bool perf_probe_with_var(struct perf_probe_event *pev)
1706 {
1707         int i = 0;
1708 
1709         for (i = 0; i < pev->nargs; i++)
1710                 if (is_c_varname(pev->args[i].var)              ||
1711                     !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1712                     !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1713                         return true;
1714         return false;
1715 }
1716 
1717 /* Return true if this perf_probe_event requires debuginfo */
1718 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1719 {
1720         if (pev->point.file || pev->point.line || pev->point.lazy_line)
1721                 return true;
1722 
1723         if (perf_probe_with_var(pev))
1724                 return true;
1725 
1726         return false;
1727 }
1728 
1729 /* Parse probe_events event into struct probe_point */
1730 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1731 {
1732         struct probe_trace_point *tp = &tev->point;
1733         char pr;
1734         char *p;
1735         char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1736         int ret, i, argc;
1737         char **argv;
1738 
1739         pr_debug("Parsing probe_events: %s\n", cmd);
1740         argv = argv_split(cmd, &argc);
1741         if (!argv) {
1742                 pr_debug("Failed to split arguments.\n");
1743                 return -ENOMEM;
1744         }
1745         if (argc < 2) {
1746                 semantic_error("Too few probe arguments.\n");
1747                 ret = -ERANGE;
1748                 goto out;
1749         }
1750 
1751         /* Scan event and group name. */
1752         argv0_str = strdup(argv[0]);
1753         if (argv0_str == NULL) {
1754                 ret = -ENOMEM;
1755                 goto out;
1756         }
1757         fmt1_str = strtok_r(argv0_str, ":", &fmt);
1758         fmt2_str = strtok_r(NULL, "/", &fmt);
1759         fmt3_str = strtok_r(NULL, " \t", &fmt);
1760         if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
1761                 semantic_error("Failed to parse event name: %s\n", argv[0]);
1762                 ret = -EINVAL;
1763                 goto out;
1764         }
1765         pr = fmt1_str[0];
1766         tev->group = strdup(fmt2_str);
1767         tev->event = strdup(fmt3_str);
1768         if (tev->group == NULL || tev->event == NULL) {
1769                 ret = -ENOMEM;
1770                 goto out;
1771         }
1772         pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1773 
1774         tp->retprobe = (pr == 'r');
1775 
1776         /* Scan module name(if there), function name and offset */
1777         p = strchr(argv[1], ':');
1778         if (p) {
1779                 tp->module = strndup(argv[1], p - argv[1]);
1780                 if (!tp->module) {
1781                         ret = -ENOMEM;
1782                         goto out;
1783                 }
1784                 tev->uprobes = (tp->module[0] == '/');
1785                 p++;
1786         } else
1787                 p = argv[1];
1788         fmt1_str = strtok_r(p, "+", &fmt);
1789         /* only the address started with 0x */
1790         if (fmt1_str[0] == '0') {
1791                 /*
1792                  * Fix a special case:
1793                  * if address == 0, kernel reports something like:
1794                  * p:probe_libc/abs_0 /lib/libc-2.18.so:0x          (null) arg1=%ax
1795                  * Newer kernel may fix that, but we want to
1796                  * support old kernel also.
1797                  */
1798                 if (strcmp(fmt1_str, "0x") == 0) {
1799                         if (!argv[2] || strcmp(argv[2], "(null)")) {
1800                                 ret = -EINVAL;
1801                                 goto out;
1802                         }
1803                         tp->address = 0;
1804 
1805                         free(argv[2]);
1806                         for (i = 2; argv[i + 1] != NULL; i++)
1807                                 argv[i] = argv[i + 1];
1808 
1809                         argv[i] = NULL;
1810                         argc -= 1;
1811                 } else
1812                         tp->address = strtoul(fmt1_str, NULL, 0);
1813         } else {
1814                 /* Only the symbol-based probe has offset */
1815                 tp->symbol = strdup(fmt1_str);
1816                 if (tp->symbol == NULL) {
1817                         ret = -ENOMEM;
1818                         goto out;
1819                 }
1820                 fmt2_str = strtok_r(NULL, "", &fmt);
1821                 if (fmt2_str == NULL)
1822                         tp->offset = 0;
1823                 else
1824                         tp->offset = strtoul(fmt2_str, NULL, 10);
1825         }
1826 
1827         if (tev->uprobes) {
1828                 fmt2_str = strchr(p, '(');
1829                 if (fmt2_str)
1830                         tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0);
1831         }
1832 
1833         tev->nargs = argc - 2;
1834         tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1835         if (tev->args == NULL) {
1836                 ret = -ENOMEM;
1837                 goto out;
1838         }
1839         for (i = 0; i < tev->nargs; i++) {
1840                 p = strchr(argv[i + 2], '=');
1841                 if (p)  /* We don't need which register is assigned. */
1842                         *p++ = '\0';
1843                 else
1844                         p = argv[i + 2];
1845                 tev->args[i].name = strdup(argv[i + 2]);
1846                 /* TODO: parse regs and offset */
1847                 tev->args[i].value = strdup(p);
1848                 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1849                         ret = -ENOMEM;
1850                         goto out;
1851                 }
1852         }
1853         ret = 0;
1854 out:
1855         free(argv0_str);
1856         argv_free(argv);
1857         return ret;
1858 }
1859 
1860 /* Compose only probe arg */
1861 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1862 {
1863         struct perf_probe_arg_field *field = pa->field;
1864         struct strbuf buf;
1865         char *ret = NULL;
1866         int err;
1867 
1868         if (strbuf_init(&buf, 64) < 0)
1869                 return NULL;
1870 
1871         if (pa->name && pa->var)
1872                 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1873         else
1874                 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1875         if (err)
1876                 goto out;
1877 
1878         while (field) {
1879                 if (field->name[0] == '[')
1880                         err = strbuf_addstr(&buf, field->name);
1881                 else
1882                         err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1883                                           field->name);
1884                 field = field->next;
1885                 if (err)
1886                         goto out;
1887         }
1888 
1889         if (pa->type)
1890                 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1891                         goto out;
1892 
1893         ret = strbuf_detach(&buf, NULL);
1894 out:
1895         strbuf_release(&buf);
1896         return ret;
1897 }
1898 
1899 /* Compose only probe point (not argument) */
1900 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1901 {
1902         struct strbuf buf;
1903         char *tmp, *ret = NULL;
1904         int len, err = 0;
1905 
1906         if (strbuf_init(&buf, 64) < 0)
1907                 return NULL;
1908 
1909         if (pp->function) {
1910                 if (strbuf_addstr(&buf, pp->function) < 0)
1911                         goto out;
1912                 if (pp->offset)
1913                         err = strbuf_addf(&buf, "+%lu", pp->offset);
1914                 else if (pp->line)
1915                         err = strbuf_addf(&buf, ":%d", pp->line);
1916                 else if (pp->retprobe)
1917                         err = strbuf_addstr(&buf, "%return");
1918                 if (err)
1919                         goto out;
1920         }
1921         if (pp->file) {
1922                 tmp = pp->file;
1923                 len = strlen(tmp);
1924                 if (len > 30) {
1925                         tmp = strchr(pp->file + len - 30, '/');
1926                         tmp = tmp ? tmp + 1 : pp->file + len - 30;
1927                 }
1928                 err = strbuf_addf(&buf, "@%s", tmp);
1929                 if (!err && !pp->function && pp->line)
1930                         err = strbuf_addf(&buf, ":%d", pp->line);
1931         }
1932         if (!err)
1933                 ret = strbuf_detach(&buf, NULL);
1934 out:
1935         strbuf_release(&buf);
1936         return ret;
1937 }
1938 
1939 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1940 {
1941         struct strbuf buf;
1942         char *tmp, *ret = NULL;
1943         int i;
1944 
1945         if (strbuf_init(&buf, 64))
1946                 return NULL;
1947         if (pev->event)
1948                 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1949                                 pev->event) < 0)
1950                         goto out;
1951 
1952         tmp = synthesize_perf_probe_point(&pev->point);
1953         if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1954                 goto out;
1955         free(tmp);
1956 
1957         for (i = 0; i < pev->nargs; i++) {
1958                 tmp = synthesize_perf_probe_arg(pev->args + i);
1959                 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1960                         goto out;
1961                 free(tmp);
1962         }
1963 
1964         ret = strbuf_detach(&buf, NULL);
1965 out:
1966         strbuf_release(&buf);
1967         return ret;
1968 }
1969 
1970 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1971                                             struct strbuf *buf, int depth)
1972 {
1973         int err;
1974         if (ref->next) {
1975                 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1976                                                          depth + 1);
1977                 if (depth < 0)
1978                         return depth;
1979         }
1980         err = strbuf_addf(buf, "%+ld(", ref->offset);
1981         return (err < 0) ? err : depth;
1982 }
1983 
1984 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1985                                       struct strbuf *buf)
1986 {
1987         struct probe_trace_arg_ref *ref = arg->ref;
1988         int depth = 0, err;
1989 
1990         /* Argument name or separator */
1991         if (arg->name)
1992                 err = strbuf_addf(buf, " %s=", arg->name);
1993         else
1994                 err = strbuf_addch(buf, ' ');
1995         if (err)
1996                 return err;
1997 
1998         /* Special case: @XXX */
1999         if (arg->value[0] == '@' && arg->ref)
2000                         ref = ref->next;
2001 
2002         /* Dereferencing arguments */
2003         if (ref) {
2004                 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
2005                 if (depth < 0)
2006                         return depth;
2007         }
2008 
2009         /* Print argument value */
2010         if (arg->value[0] == '@' && arg->ref)
2011                 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2012         else
2013                 err = strbuf_addstr(buf, arg->value);
2014 
2015         /* Closing */
2016         while (!err && depth--)
2017                 err = strbuf_addch(buf, ')');
2018 
2019         /* Print argument type */
2020         if (!err && arg->type)
2021                 err = strbuf_addf(buf, ":%s", arg->type);
2022 
2023         return err;
2024 }
2025 
2026 static int
2027 synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf)
2028 {
2029         struct probe_trace_point *tp = &tev->point;
2030         int err;
2031 
2032         err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address);
2033 
2034         if (err >= 0 && tp->ref_ctr_offset) {
2035                 if (!uprobe_ref_ctr_is_supported())
2036                         return -1;
2037                 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
2038         }
2039         return err >= 0 ? 0 : -1;
2040 }
2041 
2042 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2043 {
2044         struct probe_trace_point *tp = &tev->point;
2045         struct strbuf buf;
2046         char *ret = NULL;
2047         int i, err;
2048 
2049         /* Uprobes must have tp->module */
2050         if (tev->uprobes && !tp->module)
2051                 return NULL;
2052 
2053         if (strbuf_init(&buf, 32) < 0)
2054                 return NULL;
2055 
2056         if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2057                         tev->group, tev->event) < 0)
2058                 goto error;
2059         /*
2060          * If tp->address == 0, then this point must be a
2061          * absolute address uprobe.
2062          * try_to_find_absolute_address() should have made
2063          * tp->symbol to "0x0".
2064          */
2065         if (tev->uprobes && !tp->address) {
2066                 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2067                         goto error;
2068         }
2069 
2070         /* Use the tp->address for uprobes */
2071         if (tev->uprobes) {
2072                 err = synthesize_uprobe_trace_def(tev, &buf);
2073         } else if (!strncmp(tp->symbol, "0x", 2)) {
2074                 /* Absolute address. See try_to_find_absolute_address() */
2075                 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2076                                   tp->module ? ":" : "", tp->address);
2077         } else {
2078                 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2079                                 tp->module ? ":" : "", tp->symbol, tp->offset);
2080         }
2081 
2082         if (err)
2083                 goto error;
2084 
2085         for (i = 0; i < tev->nargs; i++)
2086                 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
2087                         goto error;
2088 
2089         ret = strbuf_detach(&buf, NULL);
2090 error:
2091         strbuf_release(&buf);
2092         return ret;
2093 }
2094 
2095 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2096                                           struct perf_probe_point *pp,
2097                                           bool is_kprobe)
2098 {
2099         struct symbol *sym = NULL;
2100         struct map *map = NULL;
2101         u64 addr = tp->address;
2102         int ret = -ENOENT;
2103 
2104         if (!is_kprobe) {
2105                 map = dso__new_map(tp->module);
2106                 if (!map)
2107                         goto out;
2108                 sym = map__find_symbol(map, addr);
2109         } else {
2110                 if (tp->symbol && !addr) {
2111                         if (kernel_get_symbol_address_by_name(tp->symbol,
2112                                                 &addr, true, false) < 0)
2113                                 goto out;
2114                 }
2115                 if (addr) {
2116                         addr += tp->offset;
2117                         sym = machine__find_kernel_symbol(host_machine, addr, &map);
2118                 }
2119         }
2120 
2121         if (!sym)
2122                 goto out;
2123 
2124         pp->retprobe = tp->retprobe;
2125         pp->offset = addr - map->unmap_ip(map, sym->start);
2126         pp->function = strdup(sym->name);
2127         ret = pp->function ? 0 : -ENOMEM;
2128 
2129 out:
2130         if (map && !is_kprobe) {
2131                 map__put(map);
2132         }
2133 
2134         return ret;
2135 }
2136 
2137 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2138                                        struct perf_probe_point *pp,
2139                                        bool is_kprobe)
2140 {
2141         char buf[128];
2142         int ret;
2143 
2144         ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2145         if (!ret)
2146                 return 0;
2147         ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2148         if (!ret)
2149                 return 0;
2150 
2151         pr_debug("Failed to find probe point from both of dwarf and map.\n");
2152 
2153         if (tp->symbol) {
2154                 pp->function = strdup(tp->symbol);
2155                 pp->offset = tp->offset;
2156         } else {
2157                 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2158                 if (ret < 0)
2159                         return ret;
2160                 pp->function = strdup(buf);
2161                 pp->offset = 0;
2162         }
2163         if (pp->function == NULL)
2164                 return -ENOMEM;
2165 
2166         pp->retprobe = tp->retprobe;
2167 
2168         return 0;
2169 }
2170 
2171 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2172                                struct perf_probe_event *pev, bool is_kprobe)
2173 {
2174         struct strbuf buf = STRBUF_INIT;
2175         int i, ret;
2176 
2177         /* Convert event/group name */
2178         pev->event = strdup(tev->event);
2179         pev->group = strdup(tev->group);
2180         if (pev->event == NULL || pev->group == NULL)
2181                 return -ENOMEM;
2182 
2183         /* Convert trace_point to probe_point */
2184         ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2185         if (ret < 0)
2186                 return ret;
2187 
2188         /* Convert trace_arg to probe_arg */
2189         pev->nargs = tev->nargs;
2190         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2191         if (pev->args == NULL)
2192                 return -ENOMEM;
2193         for (i = 0; i < tev->nargs && ret >= 0; i++) {
2194                 if (tev->args[i].name)
2195                         pev->args[i].name = strdup(tev->args[i].name);
2196                 else {
2197                         if ((ret = strbuf_init(&buf, 32)) < 0)
2198                                 goto error;
2199                         ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2200                         pev->args[i].name = strbuf_detach(&buf, NULL);
2201                 }
2202                 if (pev->args[i].name == NULL && ret >= 0)
2203                         ret = -ENOMEM;
2204         }
2205 error:
2206         if (ret < 0)
2207                 clear_perf_probe_event(pev);
2208 
2209         return ret;
2210 }
2211 
2212 void clear_perf_probe_event(struct perf_probe_event *pev)
2213 {
2214         struct perf_probe_arg_field *field, *next;
2215         int i;
2216 
2217         zfree(&pev->event);
2218         zfree(&pev->group);
2219         zfree(&pev->target);
2220         clear_perf_probe_point(&pev->point);
2221 
2222         for (i = 0; i < pev->nargs; i++) {
2223                 zfree(&pev->args[i].name);
2224                 zfree(&pev->args[i].var);
2225                 zfree(&pev->args[i].type);
2226                 field = pev->args[i].field;
2227                 while (field) {
2228                         next = field->next;
2229                         zfree(&field->name);
2230                         free(field);
2231                         field = next;
2232                 }
2233         }
2234         pev->nargs = 0;
2235         zfree(&pev->args);
2236 }
2237 
2238 #define strdup_or_goto(str, label)      \
2239 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2240 
2241 static int perf_probe_point__copy(struct perf_probe_point *dst,
2242                                   struct perf_probe_point *src)
2243 {
2244         dst->file = strdup_or_goto(src->file, out_err);
2245         dst->function = strdup_or_goto(src->function, out_err);
2246         dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2247         dst->line = src->line;
2248         dst->retprobe = src->retprobe;
2249         dst->offset = src->offset;
2250         return 0;
2251 
2252 out_err:
2253         clear_perf_probe_point(dst);
2254         return -ENOMEM;
2255 }
2256 
2257 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2258                                 struct perf_probe_arg *src)
2259 {
2260         struct perf_probe_arg_field *field, **ppfield;
2261 
2262         dst->name = strdup_or_goto(src->name, out_err);
2263         dst->var = strdup_or_goto(src->var, out_err);
2264         dst->type = strdup_or_goto(src->type, out_err);
2265 
2266         field = src->field;
2267         ppfield = &(dst->field);
2268         while (field) {
2269                 *ppfield = zalloc(sizeof(*field));
2270                 if (!*ppfield)
2271                         goto out_err;
2272                 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2273                 (*ppfield)->index = field->index;
2274                 (*ppfield)->ref = field->ref;
2275                 field = field->next;
2276                 ppfield = &((*ppfield)->next);
2277         }
2278         return 0;
2279 out_err:
2280         return -ENOMEM;
2281 }
2282 
2283 int perf_probe_event__copy(struct perf_probe_event *dst,
2284                            struct perf_probe_event *src)
2285 {
2286         int i;
2287 
2288         dst->event = strdup_or_goto(src->event, out_err);
2289         dst->group = strdup_or_goto(src->group, out_err);
2290         dst->target = strdup_or_goto(src->target, out_err);
2291         dst->uprobes = src->uprobes;
2292 
2293         if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2294                 goto out_err;
2295 
2296         dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2297         if (!dst->args)
2298                 goto out_err;
2299         dst->nargs = src->nargs;
2300 
2301         for (i = 0; i < src->nargs; i++)
2302                 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2303                         goto out_err;
2304         return 0;
2305 
2306 out_err:
2307         clear_perf_probe_event(dst);
2308         return -ENOMEM;
2309 }
2310 
2311 void clear_probe_trace_event(struct probe_trace_event *tev)
2312 {
2313         struct probe_trace_arg_ref *ref, *next;
2314         int i;
2315 
2316         zfree(&tev->event);
2317         zfree(&tev->group);
2318         zfree(&tev->point.symbol);
2319         zfree(&tev->point.realname);
2320         zfree(&tev->point.module);
2321         for (i = 0; i < tev->nargs; i++) {
2322                 zfree(&tev->args[i].name);
2323                 zfree(&tev->args[i].value);
2324                 zfree(&tev->args[i].type);
2325                 ref = tev->args[i].ref;
2326                 while (ref) {
2327                         next = ref->next;
2328                         free(ref);
2329                         ref = next;
2330                 }
2331         }
2332         zfree(&tev->args);
2333         tev->nargs = 0;
2334 }
2335 
2336 struct kprobe_blacklist_node {
2337         struct list_head list;
2338         unsigned long start;
2339         unsigned long end;
2340         char *symbol;
2341 };
2342 
2343 static void kprobe_blacklist__delete(struct list_head *blacklist)
2344 {
2345         struct kprobe_blacklist_node *node;
2346 
2347         while (!list_empty(blacklist)) {
2348                 node = list_first_entry(blacklist,
2349                                         struct kprobe_blacklist_node, list);
2350                 list_del_init(&node->list);
2351                 zfree(&node->symbol);
2352                 free(node);
2353         }
2354 }
2355 
2356 static int kprobe_blacklist__load(struct list_head *blacklist)
2357 {
2358         struct kprobe_blacklist_node *node;
2359         const char *__debugfs = debugfs__mountpoint();
2360         char buf[PATH_MAX], *p;
2361         FILE *fp;
2362         int ret;
2363 
2364         if (__debugfs == NULL)
2365                 return -ENOTSUP;
2366 
2367         ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2368         if (ret < 0)
2369                 return ret;
2370 
2371         fp = fopen(buf, "r");
2372         if (!fp)
2373                 return -errno;
2374 
2375         ret = 0;
2376         while (fgets(buf, PATH_MAX, fp)) {
2377                 node = zalloc(sizeof(*node));
2378                 if (!node) {
2379                         ret = -ENOMEM;
2380                         break;
2381                 }
2382                 INIT_LIST_HEAD(&node->list);
2383                 list_add_tail(&node->list, blacklist);
2384                 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2385                         ret = -EINVAL;
2386                         break;
2387                 }
2388                 p = strchr(buf, '\t');
2389                 if (p) {
2390                         p++;
2391                         if (p[strlen(p) - 1] == '\n')
2392                                 p[strlen(p) - 1] = '\0';
2393                 } else
2394                         p = (char *)"unknown";
2395                 node->symbol = strdup(p);
2396                 if (!node->symbol) {
2397                         ret = -ENOMEM;
2398                         break;
2399                 }
2400                 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2401                           node->start, node->end, node->symbol);
2402                 ret++;
2403         }
2404         if (ret < 0)
2405                 kprobe_blacklist__delete(blacklist);
2406         fclose(fp);
2407 
2408         return ret;
2409 }
2410 
2411 static struct kprobe_blacklist_node *
2412 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2413                                   unsigned long address)
2414 {
2415         struct kprobe_blacklist_node *node;
2416 
2417         list_for_each_entry(node, blacklist, list) {
2418                 if (node->start <= address && address < node->end)
2419                         return node;
2420         }
2421 
2422         return NULL;
2423 }
2424 
2425 static LIST_HEAD(kprobe_blacklist);
2426 
2427 static void kprobe_blacklist__init(void)
2428 {
2429         if (!list_empty(&kprobe_blacklist))
2430                 return;
2431 
2432         if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2433                 pr_debug("No kprobe blacklist support, ignored\n");
2434 }
2435 
2436 static void kprobe_blacklist__release(void)
2437 {
2438         kprobe_blacklist__delete(&kprobe_blacklist);
2439 }
2440 
2441 static bool kprobe_blacklist__listed(unsigned long address)
2442 {
2443         return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2444 }
2445 
2446 static int perf_probe_event__sprintf(const char *group, const char *event,
2447                                      struct perf_probe_event *pev,
2448                                      const char *module,
2449                                      struct strbuf *result)
2450 {
2451         int i, ret;
2452         char *buf;
2453 
2454         if (asprintf(&buf, "%s:%s", group, event) < 0)
2455                 return -errno;
2456         ret = strbuf_addf(result, "  %-20s (on ", buf);
2457         free(buf);
2458         if (ret)
2459                 return ret;
2460 
2461         /* Synthesize only event probe point */
2462         buf = synthesize_perf_probe_point(&pev->point);
2463         if (!buf)
2464                 return -ENOMEM;
2465         ret = strbuf_addstr(result, buf);
2466         free(buf);
2467 
2468         if (!ret && module)
2469                 ret = strbuf_addf(result, " in %s", module);
2470 
2471         if (!ret && pev->nargs > 0) {
2472                 ret = strbuf_add(result, " with", 5);
2473                 for (i = 0; !ret && i < pev->nargs; i++) {
2474                         buf = synthesize_perf_probe_arg(&pev->args[i]);
2475                         if (!buf)
2476                                 return -ENOMEM;
2477                         ret = strbuf_addf(result, " %s", buf);
2478                         free(buf);
2479                 }
2480         }
2481         if (!ret)
2482                 ret = strbuf_addch(result, ')');
2483 
2484         return ret;
2485 }
2486 
2487 /* Show an event */
2488 int show_perf_probe_event(const char *group, const char *event,
2489                           struct perf_probe_event *pev,
2490                           const char *module, bool use_stdout)
2491 {
2492         struct strbuf buf = STRBUF_INIT;
2493         int ret;
2494 
2495         ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2496         if (ret >= 0) {
2497                 if (use_stdout)
2498                         printf("%s\n", buf.buf);
2499                 else
2500                         pr_info("%s\n", buf.buf);
2501         }
2502         strbuf_release(&buf);
2503 
2504         return ret;
2505 }
2506 
2507 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2508                                      struct strfilter *filter)
2509 {
2510         char tmp[128];
2511 
2512         /* At first, check the event name itself */
2513         if (strfilter__compare(filter, tev->event))
2514                 return true;
2515 
2516         /* Next, check the combination of name and group */
2517         if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2518                 return false;
2519         return strfilter__compare(filter, tmp);
2520 }
2521 
2522 static int __show_perf_probe_events(int fd, bool is_kprobe,
2523                                     struct strfilter *filter)
2524 {
2525         int ret = 0;
2526         struct probe_trace_event tev;
2527         struct perf_probe_event pev;
2528         struct strlist *rawlist;
2529         struct str_node *ent;
2530 
2531         memset(&tev, 0, sizeof(tev));
2532         memset(&pev, 0, sizeof(pev));
2533 
2534         rawlist = probe_file__get_rawlist(fd);
2535         if (!rawlist)
2536                 return -ENOMEM;
2537 
2538         strlist__for_each_entry(ent, rawlist) {
2539                 ret = parse_probe_trace_command(ent->s, &tev);
2540                 if (ret >= 0) {
2541                         if (!filter_probe_trace_event(&tev, filter))
2542                                 goto next;
2543                         ret = convert_to_perf_probe_event(&tev, &pev,
2544                                                                 is_kprobe);
2545                         if (ret < 0)
2546                                 goto next;
2547                         ret = show_perf_probe_event(pev.group, pev.event,
2548                                                     &pev, tev.point.module,
2549                                                     true);
2550                 }
2551 next:
2552                 clear_perf_probe_event(&pev);
2553                 clear_probe_trace_event(&tev);
2554                 if (ret < 0)
2555                         break;
2556         }
2557         strlist__delete(rawlist);
2558         /* Cleanup cached debuginfo if needed */
2559         debuginfo_cache__exit();
2560 
2561         return ret;
2562 }
2563 
2564 /* List up current perf-probe events */
2565 int show_perf_probe_events(struct strfilter *filter)
2566 {
2567         int kp_fd, up_fd, ret;
2568 
2569         setup_pager();
2570 
2571         if (probe_conf.cache)
2572                 return probe_cache__show_all_caches(filter);
2573 
2574         ret = init_probe_symbol_maps(false);
2575         if (ret < 0)
2576                 return ret;
2577 
2578         ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2579         if (ret < 0)
2580                 return ret;
2581 
2582         if (kp_fd >= 0)
2583                 ret = __show_perf_probe_events(kp_fd, true, filter);
2584         if (up_fd >= 0 && ret >= 0)
2585                 ret = __show_perf_probe_events(up_fd, false, filter);
2586         if (kp_fd > 0)
2587                 close(kp_fd);
2588         if (up_fd > 0)
2589                 close(up_fd);
2590         exit_probe_symbol_maps();
2591 
2592         return ret;
2593 }
2594 
2595 static int get_new_event_name(char *buf, size_t len, const char *base,
2596                               struct strlist *namelist, bool ret_event,
2597                               bool allow_suffix)
2598 {
2599         int i, ret;
2600         char *p, *nbase;
2601 
2602         if (*base == '.')
2603                 base++;
2604         nbase = strdup(base);
2605         if (!nbase)
2606                 return -ENOMEM;
2607 
2608         /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2609         p = strpbrk(nbase, ".@");
2610         if (p && p != nbase)
2611                 *p = '\0';
2612 
2613         /* Try no suffix number */
2614         ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2615         if (ret < 0) {
2616                 pr_debug("snprintf() failed: %d\n", ret);
2617                 goto out;
2618         }
2619         if (!strlist__has_entry(namelist, buf))
2620                 goto out;
2621 
2622         if (!allow_suffix) {
2623                 pr_warning("Error: event \"%s\" already exists.\n"
2624                            " Hint: Remove existing event by 'perf probe -d'\n"
2625                            "       or force duplicates by 'perf probe -f'\n"
2626                            "       or set 'force=yes' in BPF source.\n",
2627                            buf);
2628                 ret = -EEXIST;
2629                 goto out;
2630         }
2631 
2632         /* Try to add suffix */
2633         for (i = 1; i < MAX_EVENT_INDEX; i++) {
2634                 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2635                 if (ret < 0) {
2636                         pr_debug("snprintf() failed: %d\n", ret);
2637                         goto out;
2638                 }
2639                 if (!strlist__has_entry(namelist, buf))
2640                         break;
2641         }
2642         if (i == MAX_EVENT_INDEX) {
2643                 pr_warning("Too many events are on the same function.\n");
2644                 ret = -ERANGE;
2645         }
2646 
2647 out:
2648         free(nbase);
2649 
2650         /* Final validation */
2651         if (ret >= 0 && !is_c_func_name(buf)) {
2652                 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2653                            buf);
2654                 ret = -EINVAL;
2655         }
2656 
2657         return ret;
2658 }
2659 
2660 /* Warn if the current kernel's uprobe implementation is old */
2661 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2662 {
2663         int i;
2664         char *buf = synthesize_probe_trace_command(tev);
2665         struct probe_trace_point *tp = &tev->point;
2666 
2667         if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) {
2668                 pr_warning("A semaphore is associated with %s:%s and "
2669                            "seems your kernel doesn't support it.\n",
2670                            tev->group, tev->event);
2671         }
2672 
2673         /* Old uprobe event doesn't support memory dereference */
2674         if (!tev->uprobes || tev->nargs == 0 || !buf)
2675                 goto out;
2676 
2677         for (i = 0; i < tev->nargs; i++)
2678                 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2679                         pr_warning("Please upgrade your kernel to at least "
2680                                    "3.14 to have access to feature %s\n",
2681                                    tev->args[i].value);
2682                         break;
2683                 }
2684 out:
2685         free(buf);
2686 }
2687 
2688 /* Set new name from original perf_probe_event and namelist */
2689 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2690                                        struct perf_probe_event *pev,
2691                                        struct strlist *namelist,
2692                                        bool allow_suffix)
2693 {
2694         const char *event, *group;
2695         char buf[64];
2696         int ret;
2697 
2698         /* If probe_event or trace_event already have the name, reuse it */
2699         if (pev->event && !pev->sdt)
2700                 event = pev->event;
2701         else if (tev->event)
2702                 event = tev->event;
2703         else {
2704                 /* Or generate new one from probe point */
2705                 if (pev->point.function &&
2706                         (strncmp(pev->point.function, "0x", 2) != 0) &&
2707                         !strisglob(pev->point.function))
2708                         event = pev->point.function;
2709                 else
2710                         event = tev->point.realname;
2711         }
2712         if (pev->group && !pev->sdt)
2713                 group = pev->group;
2714         else if (tev->group)
2715                 group = tev->group;
2716         else
2717                 group = PERFPROBE_GROUP;
2718 
2719         /* Get an unused new event name */
2720         ret = get_new_event_name(buf, 64, event, namelist,
2721                                  tev->point.retprobe, allow_suffix);
2722         if (ret < 0)
2723                 return ret;
2724 
2725         event = buf;
2726 
2727         tev->event = strdup(event);
2728         tev->group = strdup(group);
2729         if (tev->event == NULL || tev->group == NULL)
2730                 return -ENOMEM;
2731 
2732         /* Add added event name to namelist */
2733         strlist__add(namelist, event);
2734         return 0;
2735 }
2736 
2737 static int __open_probe_file_and_namelist(bool uprobe,
2738                                           struct strlist **namelist)
2739 {
2740         int fd;
2741 
2742         fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2743         if (fd < 0)
2744                 return fd;
2745 
2746         /* Get current event names */
2747         *namelist = probe_file__get_namelist(fd);
2748         if (!(*namelist)) {
2749                 pr_debug("Failed to get current event list.\n");
2750                 close(fd);
2751                 return -ENOMEM;
2752         }
2753         return fd;
2754 }
2755 
2756 static int __add_probe_trace_events(struct perf_probe_event *pev,
2757                                      struct probe_trace_event *tevs,
2758                                      int ntevs, bool allow_suffix)
2759 {
2760         int i, fd[2] = {-1, -1}, up, ret;
2761         struct probe_trace_event *tev = NULL;
2762         struct probe_cache *cache = NULL;
2763         struct strlist *namelist[2] = {NULL, NULL};
2764         struct nscookie nsc;
2765 
2766         up = pev->uprobes ? 1 : 0;
2767         fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2768         if (fd[up] < 0)
2769                 return fd[up];
2770 
2771         ret = 0;
2772         for (i = 0; i < ntevs; i++) {
2773                 tev = &tevs[i];
2774                 up = tev->uprobes ? 1 : 0;
2775                 if (fd[up] == -1) {     /* Open the kprobe/uprobe_events */
2776                         fd[up] = __open_probe_file_and_namelist(up,
2777                                                                 &namelist[up]);
2778                         if (fd[up] < 0)
2779                                 goto close_out;
2780                 }
2781                 /* Skip if the symbol is out of .text or blacklisted */
2782                 if (!tev->point.symbol && !pev->uprobes)
2783                         continue;
2784 
2785                 /* Set new name for tev (and update namelist) */
2786                 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2787                                                   allow_suffix);
2788                 if (ret < 0)
2789                         break;
2790 
2791                 nsinfo__mountns_enter(pev->nsi, &nsc);
2792                 ret = probe_file__add_event(fd[up], tev);
2793                 nsinfo__mountns_exit(&nsc);
2794                 if (ret < 0)
2795                         break;
2796 
2797                 /*
2798                  * Probes after the first probe which comes from same
2799                  * user input are always allowed to add suffix, because
2800                  * there might be several addresses corresponding to
2801                  * one code line.
2802                  */
2803                 allow_suffix = true;
2804         }
2805         if (ret == -EINVAL && pev->uprobes)
2806                 warn_uprobe_event_compat(tev);
2807         if (ret == 0 && probe_conf.cache) {
2808                 cache = probe_cache__new(pev->target, pev->nsi);
2809                 if (!cache ||
2810                     probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2811                     probe_cache__commit(cache) < 0)
2812                         pr_warning("Failed to add event to probe cache\n");
2813                 probe_cache__delete(cache);
2814         }
2815 
2816 close_out:
2817         for (up = 0; up < 2; up++) {
2818                 strlist__delete(namelist[up]);
2819                 if (fd[up] >= 0)
2820                         close(fd[up]);
2821         }
2822         return ret;
2823 }
2824 
2825 static int find_probe_functions(struct map *map, char *name,
2826                                 struct symbol **syms)
2827 {
2828         int found = 0;
2829         struct symbol *sym;
2830         struct rb_node *tmp;
2831         const char *norm, *ver;
2832         char *buf = NULL;
2833         bool cut_version = true;
2834 
2835         if (map__load(map) < 0)
2836                 return 0;
2837 
2838         /* If user gives a version, don't cut off the version from symbols */
2839         if (strchr(name, '@'))
2840                 cut_version = false;
2841 
2842         map__for_each_symbol(map, sym, tmp) {
2843                 norm = arch__normalize_symbol_name(sym->name);
2844                 if (!norm)
2845                         continue;
2846 
2847                 if (cut_version) {
2848                         /* We don't care about default symbol or not */
2849                         ver = strchr(norm, '@');
2850                         if (ver) {
2851                                 buf = strndup(norm, ver - norm);
2852                                 if (!buf)
2853                                         return -ENOMEM;
2854                                 norm = buf;
2855                         }
2856                 }
2857 
2858                 if (strglobmatch(norm, name)) {
2859                         found++;
2860                         if (syms && found < probe_conf.max_probes)
2861                                 syms[found - 1] = sym;
2862                 }
2863                 if (buf)
2864                         zfree(&buf);
2865         }
2866 
2867         return found;
2868 }
2869 
2870 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2871                                 struct probe_trace_event *tev __maybe_unused,
2872                                 struct map *map __maybe_unused,
2873                                 struct symbol *sym __maybe_unused) { }
2874 
2875 /*
2876  * Find probe function addresses from map.
2877  * Return an error or the number of found probe_trace_event
2878  */
2879 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2880                                             struct probe_trace_event **tevs)
2881 {
2882         struct map *map = NULL;
2883         struct ref_reloc_sym *reloc_sym = NULL;
2884         struct symbol *sym;
2885         struct symbol **syms = NULL;
2886         struct probe_trace_event *tev;
2887         struct perf_probe_point *pp = &pev->point;
2888         struct probe_trace_point *tp;
2889         int num_matched_functions;
2890         int ret, i, j, skipped = 0;
2891         char *mod_name;
2892 
2893         map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2894         if (!map) {
2895                 ret = -EINVAL;
2896                 goto out;
2897         }
2898 
2899         syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2900         if (!syms) {
2901                 ret = -ENOMEM;
2902                 goto out;
2903         }
2904 
2905         /*
2906          * Load matched symbols: Since the different local symbols may have
2907          * same name but different addresses, this lists all the symbols.
2908          */
2909         num_matched_functions = find_probe_functions(map, pp->function, syms);
2910         if (num_matched_functions <= 0) {
2911                 pr_err("Failed to find symbol %s in %s\n", pp->function,
2912                         pev->target ? : "kernel");
2913                 ret = -ENOENT;
2914                 goto out;
2915         } else if (num_matched_functions > probe_conf.max_probes) {
2916                 pr_err("Too many functions matched in %s\n",
2917                         pev->target ? : "kernel");
2918                 ret = -E2BIG;
2919                 goto out;
2920         }
2921 
2922         /* Note that the symbols in the kmodule are not relocated */
2923         if (!pev->uprobes && !pev->target &&
2924                         (!pp->retprobe || kretprobe_offset_is_supported())) {
2925                 reloc_sym = kernel_get_ref_reloc_sym();
2926                 if (!reloc_sym) {
2927                         pr_warning("Relocated base symbol is not found!\n");
2928                         ret = -EINVAL;
2929                         goto out;
2930                 }
2931         }
2932 
2933         /* Setup result trace-probe-events */
2934         *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2935         if (!*tevs) {
2936                 ret = -ENOMEM;
2937                 goto out;
2938         }
2939 
2940         ret = 0;
2941 
2942         for (j = 0; j < num_matched_functions; j++) {
2943                 sym = syms[j];
2944 
2945                 tev = (*tevs) + ret;
2946                 tp = &tev->point;
2947                 if (ret == num_matched_functions) {
2948                         pr_warning("Too many symbols are listed. Skip it.\n");
2949                         break;
2950                 }
2951                 ret++;
2952 
2953                 if (pp->offset > sym->end - sym->start) {
2954                         pr_warning("Offset %ld is bigger than the size of %s\n",
2955                                    pp->offset, sym->name);
2956                         ret = -ENOENT;
2957                         goto err_out;
2958                 }
2959                 /* Add one probe point */
2960                 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2961 
2962                 /* Check the kprobe (not in module) is within .text  */
2963                 if (!pev->uprobes && !pev->target &&
2964                     kprobe_warn_out_range(sym->name, tp->address)) {
2965                         tp->symbol = NULL;      /* Skip it */
2966                         skipped++;
2967                 } else if (reloc_sym) {
2968                         tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2969                         tp->offset = tp->address - reloc_sym->addr;
2970                 } else {
2971                         tp->symbol = strdup_or_goto(sym->name, nomem_out);
2972                         tp->offset = pp->offset;
2973                 }
2974                 tp->realname = strdup_or_goto(sym->name, nomem_out);
2975 
2976                 tp->retprobe = pp->retprobe;
2977                 if (pev->target) {
2978                         if (pev->uprobes) {
2979                                 tev->point.module = strdup_or_goto(pev->target,
2980                                                                    nomem_out);
2981                         } else {
2982                                 mod_name = find_module_name(pev->target);
2983                                 tev->point.module =
2984                                         strdup(mod_name ? mod_name : pev->target);
2985                                 free(mod_name);
2986                                 if (!tev->point.module)
2987                                         goto nomem_out;
2988                         }
2989                 }
2990                 tev->uprobes = pev->uprobes;
2991                 tev->nargs = pev->nargs;
2992                 if (tev->nargs) {
2993                         tev->args = zalloc(sizeof(struct probe_trace_arg) *
2994                                            tev->nargs);
2995                         if (tev->args == NULL)
2996                                 goto nomem_out;
2997                 }
2998                 for (i = 0; i < tev->nargs; i++) {
2999                         if (pev->args[i].name)
3000                                 tev->args[i].name =
3001                                         strdup_or_goto(pev->args[i].name,
3002                                                         nomem_out);
3003 
3004                         tev->args[i].value = strdup_or_goto(pev->args[i].var,
3005                                                             nomem_out);
3006                         if (pev->args[i].type)
3007                                 tev->args[i].type =
3008                                         strdup_or_goto(pev->args[i].type,
3009                                                         nomem_out);
3010                 }
3011                 arch__fix_tev_from_maps(pev, tev, map, sym);
3012         }
3013         if (ret == skipped) {
3014                 ret = -ENOENT;
3015                 goto err_out;
3016         }
3017 
3018 out:
3019         map__put(map);
3020         free(syms);
3021         return ret;
3022 
3023 nomem_out:
3024         ret = -ENOMEM;
3025 err_out:
3026         clear_probe_trace_events(*tevs, num_matched_functions);
3027         zfree(tevs);
3028         goto out;
3029 }
3030 
3031 static int try_to_find_absolute_address(struct perf_probe_event *pev,
3032                                         struct probe_trace_event **tevs)
3033 {
3034         struct perf_probe_point *pp = &pev->point;
3035         struct probe_trace_event *tev;
3036         struct probe_trace_point *tp;
3037         int i, err;
3038 
3039         if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3040                 return -EINVAL;
3041         if (perf_probe_event_need_dwarf(pev))
3042                 return -EINVAL;
3043 
3044         /*
3045          * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3046          * absolute address.
3047          *
3048          * Only one tev can be generated by this.
3049          */
3050         *tevs = zalloc(sizeof(*tev));
3051         if (!*tevs)
3052                 return -ENOMEM;
3053 
3054         tev = *tevs;
3055         tp = &tev->point;
3056 
3057         /*
3058          * Don't use tp->offset, use address directly, because
3059          * in synthesize_probe_trace_command() address cannot be
3060          * zero.
3061          */
3062         tp->address = pev->point.abs_address;
3063         tp->retprobe = pp->retprobe;
3064         tev->uprobes = pev->uprobes;
3065 
3066         err = -ENOMEM;
3067         /*
3068          * Give it a '0x' leading symbol name.
3069          * In __add_probe_trace_events, a NULL symbol is interpreted as
3070          * invalid.
3071          */
3072         if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3073                 goto errout;
3074 
3075         /* For kprobe, check range */
3076         if ((!tev->uprobes) &&
3077             (kprobe_warn_out_range(tev->point.symbol,
3078                                    tev->point.address))) {
3079                 err = -EACCES;
3080                 goto errout;
3081         }
3082 
3083         if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3084                 goto errout;
3085 
3086         if (pev->target) {
3087                 tp->module = strdup(pev->target);
3088                 if (!tp->module)
3089                         goto errout;
3090         }
3091 
3092         if (tev->group) {
3093                 tev->group = strdup(pev->group);
3094                 if (!tev->group)
3095                         goto errout;
3096         }
3097 
3098         if (pev->event) {
3099                 tev->event = strdup(pev->event);
3100                 if (!tev->event)
3101                         goto errout;
3102         }
3103 
3104         tev->nargs = pev->nargs;
3105         tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3106         if (!tev->args)
3107                 goto errout;
3108 
3109         for (i = 0; i < tev->nargs; i++)
3110                 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3111 
3112         return 1;
3113 
3114 errout:
3115         clear_probe_trace_events(*tevs, 1);
3116         *tevs = NULL;
3117         return err;
3118 }
3119 
3120 /* Concatinate two arrays */
3121 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3122 {
3123         void *ret;
3124 
3125         ret = malloc(sz_a + sz_b);
3126         if (ret) {
3127                 memcpy(ret, a, sz_a);
3128                 memcpy(ret + sz_a, b, sz_b);
3129         }
3130         return ret;
3131 }
3132 
3133 static int
3134 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3135                           struct probe_trace_event **tevs2, int ntevs2)
3136 {
3137         struct probe_trace_event *new_tevs;
3138         int ret = 0;
3139 
3140         if (*ntevs == 0) {
3141                 *tevs = *tevs2;
3142                 *ntevs = ntevs2;
3143                 *tevs2 = NULL;
3144                 return 0;
3145         }
3146 
3147         if (*ntevs + ntevs2 > probe_conf.max_probes)
3148                 ret = -E2BIG;
3149         else {
3150                 /* Concatinate the array of probe_trace_event */
3151                 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3152                                   *tevs2, ntevs2 * sizeof(**tevs2));
3153                 if (!new_tevs)
3154                         ret = -ENOMEM;
3155                 else {
3156                         free(*tevs);
3157                         *tevs = new_tevs;
3158                         *ntevs += ntevs2;
3159                 }
3160         }
3161         if (ret < 0)
3162                 clear_probe_trace_events(*tevs2, ntevs2);
3163         zfree(tevs2);
3164 
3165         return ret;
3166 }
3167 
3168 /*
3169  * Try to find probe_trace_event from given probe caches. Return the number
3170  * of cached events found, if an error occurs return the error.
3171  */
3172 static int find_cached_events(struct perf_probe_event *pev,
3173                               struct probe_trace_event **tevs,
3174                               const char *target)
3175 {
3176         struct probe_cache *cache;
3177         struct probe_cache_entry *entry;
3178         struct probe_trace_event *tmp_tevs = NULL;
3179         int ntevs = 0;
3180         int ret = 0;
3181 
3182         cache = probe_cache__new(target, pev->nsi);
3183         /* Return 0 ("not found") if the target has no probe cache. */
3184         if (!cache)
3185                 return 0;
3186 
3187         for_each_probe_cache_entry(entry, cache) {
3188                 /* Skip the cache entry which has no name */
3189                 if (!entry->pev.event || !entry->pev.group)
3190                         continue;
3191                 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3192                     strglobmatch(entry->pev.event, pev->event)) {
3193                         ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3194                         if (ret > 0)
3195                                 ret = concat_probe_trace_events(tevs, &ntevs,
3196                                                                 &tmp_tevs, ret);
3197                         if (ret < 0)
3198                                 break;
3199                 }
3200         }
3201         probe_cache__delete(cache);
3202         if (ret < 0) {
3203                 clear_probe_trace_events(*tevs, ntevs);
3204                 zfree(tevs);
3205         } else {
3206                 ret = ntevs;
3207                 if (ntevs > 0 && target && target[0] == '/')
3208                         pev->uprobes = true;
3209         }
3210 
3211         return ret;
3212 }
3213 
3214 /* Try to find probe_trace_event from all probe caches */
3215 static int find_cached_events_all(struct perf_probe_event *pev,
3216                                    struct probe_trace_event **tevs)
3217 {
3218         struct probe_trace_event *tmp_tevs = NULL;
3219         struct strlist *bidlist;
3220         struct str_node *nd;
3221         char *pathname;
3222         int ntevs = 0;
3223         int ret;
3224 
3225         /* Get the buildid list of all valid caches */
3226         bidlist = build_id_cache__list_all(true);
3227         if (!bidlist) {
3228                 ret = -errno;
3229                 pr_debug("Failed to get buildids: %d\n", ret);
3230                 return ret;
3231         }
3232 
3233         ret = 0;
3234         strlist__for_each_entry(nd, bidlist) {
3235                 pathname = build_id_cache__origname(nd->s);
3236                 ret = find_cached_events(pev, &tmp_tevs, pathname);
3237                 /* In the case of cnt == 0, we just skip it */
3238                 if (ret > 0)
3239                         ret = concat_probe_trace_events(tevs, &ntevs,
3240                                                         &tmp_tevs, ret);
3241                 free(pathname);
3242                 if (ret < 0)
3243                         break;
3244         }
3245         strlist__delete(bidlist);
3246 
3247         if (ret < 0) {
3248                 clear_probe_trace_events(*tevs, ntevs);
3249                 zfree(tevs);
3250         } else
3251                 ret = ntevs;
3252 
3253         return ret;
3254 }
3255 
3256 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3257                                               struct probe_trace_event **tevs)
3258 {
3259         struct probe_cache *cache;
3260         struct probe_cache_entry *entry;
3261         struct probe_trace_event *tev;
3262         struct str_node *node;
3263         int ret, i;
3264 
3265         if (pev->sdt) {
3266                 /* For SDT/cached events, we use special search functions */
3267                 if (!pev->target)
3268                         return find_cached_events_all(pev, tevs);
3269                 else
3270                         return find_cached_events(pev, tevs, pev->target);
3271         }
3272         cache = probe_cache__new(pev->target, pev->nsi);
3273         if (!cache)
3274                 return 0;
3275 
3276         entry = probe_cache__find(cache, pev);
3277         if (!entry) {
3278                 /* SDT must be in the cache */
3279                 ret = pev->sdt ? -ENOENT : 0;
3280                 goto out;
3281         }
3282 
3283         ret = strlist__nr_entries(entry->tevlist);
3284         if (ret > probe_conf.max_probes) {
3285                 pr_debug("Too many entries matched in the cache of %s\n",
3286                          pev->target ? : "kernel");
3287                 ret = -E2BIG;
3288                 goto out;
3289         }
3290 
3291         *tevs = zalloc(ret * sizeof(*tev));
3292         if (!*tevs) {
3293                 ret = -ENOMEM;
3294                 goto out;
3295         }
3296 
3297         i = 0;
3298         strlist__for_each_entry(node, entry->tevlist) {
3299                 tev = &(*tevs)[i++];
3300                 ret = parse_probe_trace_command(node->s, tev);
3301                 if (ret < 0)
3302                         goto out;
3303                 /* Set the uprobes attribute as same as original */
3304                 tev->uprobes = pev->uprobes;
3305         }
3306         ret = i;
3307 
3308 out:
3309         probe_cache__delete(cache);
3310         return ret;
3311 }
3312 
3313 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3314                                          struct probe_trace_event **tevs)
3315 {
3316         int ret;
3317 
3318         if (!pev->group && !pev->sdt) {
3319                 /* Set group name if not given */
3320                 if (!pev->uprobes) {
3321                         pev->group = strdup(PERFPROBE_GROUP);
3322                         ret = pev->group ? 0 : -ENOMEM;
3323                 } else
3324                         ret = convert_exec_to_group(pev->target, &pev->group);
3325                 if (ret != 0) {
3326                         pr_warning("Failed to make a group name.\n");
3327                         return ret;
3328                 }
3329         }
3330 
3331         ret = try_to_find_absolute_address(pev, tevs);
3332         if (ret > 0)
3333                 return ret;
3334 
3335         /* At first, we need to lookup cache entry */
3336         ret = find_probe_trace_events_from_cache(pev, tevs);
3337         if (ret > 0 || pev->sdt)        /* SDT can be found only in the cache */
3338                 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3339 
3340         /* Convert perf_probe_event with debuginfo */
3341         ret = try_to_find_probe_trace_events(pev, tevs);
3342         if (ret != 0)
3343                 return ret;     /* Found in debuginfo or got an error */
3344 
3345         return find_probe_trace_events_from_map(pev, tevs);
3346 }
3347 
3348 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3349 {
3350         int i, ret;
3351 
3352         /* Loop 1: convert all events */
3353         for (i = 0; i < npevs; i++) {
3354                 /* Init kprobe blacklist if needed */
3355                 if (!pevs[i].uprobes)
3356                         kprobe_blacklist__init();
3357                 /* Convert with or without debuginfo */
3358                 ret  = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3359                 if (ret < 0)
3360                         return ret;
3361                 pevs[i].ntevs = ret;
3362         }
3363         /* This just release blacklist only if allocated */
3364         kprobe_blacklist__release();
3365 
3366         return 0;
3367 }
3368 
3369 static int show_probe_trace_event(struct probe_trace_event *tev)
3370 {
3371         char *buf = synthesize_probe_trace_command(tev);
3372 
3373         if (!buf) {
3374                 pr_debug("Failed to synthesize probe trace event.\n");
3375                 return -EINVAL;
3376         }
3377 
3378         /* Showing definition always go stdout */
3379         printf("%s\n", buf);
3380         free(buf);
3381 
3382         return 0;
3383 }
3384 
3385 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3386 {
3387         struct strlist *namelist = strlist__new(NULL, NULL);
3388         struct probe_trace_event *tev;
3389         struct perf_probe_event *pev;
3390         int i, j, ret = 0;
3391 
3392         if (!namelist)
3393                 return -ENOMEM;
3394 
3395         for (j = 0; j < npevs && !ret; j++) {
3396                 pev = &pevs[j];
3397                 for (i = 0; i < pev->ntevs && !ret; i++) {
3398                         tev = &pev->tevs[i];
3399                         /* Skip if the symbol is out of .text or blacklisted */
3400                         if (!tev->point.symbol && !pev->uprobes)
3401                                 continue;
3402 
3403                         /* Set new name for tev (and update namelist) */
3404                         ret = probe_trace_event__set_name(tev, pev,
3405                                                           namelist, true);
3406                         if (!ret)
3407                                 ret = show_probe_trace_event(tev);
3408                 }
3409         }
3410         strlist__delete(namelist);
3411 
3412         return ret;
3413 }
3414 
3415 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3416 {
3417         int i, ret = 0;
3418 
3419         /* Loop 2: add all events */
3420         for (i = 0; i < npevs; i++) {
3421                 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3422                                                pevs[i].ntevs,
3423                                                probe_conf.force_add);
3424                 if (ret < 0)
3425                         break;
3426         }
3427         return ret;
3428 }
3429 
3430 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3431 {
3432         int i, j;
3433         struct perf_probe_event *pev;
3434 
3435         /* Loop 3: cleanup and free trace events  */
3436         for (i = 0; i < npevs; i++) {
3437                 pev = &pevs[i];
3438                 for (j = 0; j < pevs[i].ntevs; j++)
3439                         clear_probe_trace_event(&pevs[i].tevs[j]);
3440                 zfree(&pevs[i].tevs);
3441                 pevs[i].ntevs = 0;
3442                 nsinfo__zput(pev->nsi);
3443                 clear_perf_probe_event(&pevs[i]);
3444         }
3445 }
3446 
3447 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3448 {
3449         int ret;
3450 
3451         ret = init_probe_symbol_maps(pevs->uprobes);
3452         if (ret < 0)
3453                 return ret;
3454 
3455         ret = convert_perf_probe_events(pevs, npevs);
3456         if (ret == 0)
3457                 ret = apply_perf_probe_events(pevs, npevs);
3458 
3459         cleanup_perf_probe_events(pevs, npevs);
3460 
3461         exit_probe_symbol_maps();
3462         return ret;
3463 }
3464 
3465 int del_perf_probe_events(struct strfilter *filter)
3466 {
3467         int ret, ret2, ufd = -1, kfd = -1;
3468         char *str = strfilter__string(filter);
3469 
3470         if (!str)
3471                 return -EINVAL;
3472 
3473         /* Get current event names */
3474         ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3475         if (ret < 0)
3476                 goto out;
3477 
3478         ret = probe_file__del_events(kfd, filter);
3479         if (ret < 0 && ret != -ENOENT)
3480                 goto error;
3481 
3482         ret2 = probe_file__del_events(ufd, filter);
3483         if (ret2 < 0 && ret2 != -ENOENT) {
3484                 ret = ret2;
3485                 goto error;
3486         }
3487         ret = 0;
3488 
3489 error:
3490         if (kfd >= 0)
3491                 close(kfd);
3492         if (ufd >= 0)
3493                 close(ufd);
3494 out:
3495         free(str);
3496 
3497         return ret;
3498 }
3499 
3500 int show_available_funcs(const char *target, struct nsinfo *nsi,
3501                          struct strfilter *_filter, bool user)
3502 {
3503         struct rb_node *nd;
3504         struct map *map;
3505         int ret;
3506 
3507         ret = init_probe_symbol_maps(user);
3508         if (ret < 0)
3509                 return ret;
3510 
3511         /* Get a symbol map */
3512         map = get_target_map(target, nsi, user);
3513         if (!map) {
3514                 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3515                 return -EINVAL;
3516         }
3517 
3518         ret = map__load(map);
3519         if (ret) {
3520                 if (ret == -2) {
3521                         char *str = strfilter__string(_filter);
3522                         pr_err("Failed to find symbols matched to \"%s\"\n",
3523                                str);
3524                         free(str);
3525                 } else
3526                         pr_err("Failed to load symbols in %s\n",
3527                                (target) ? : "kernel");
3528                 goto end;
3529         }
3530         if (!dso__sorted_by_name(map->dso))
3531                 dso__sort_by_name(map->dso);
3532 
3533         /* Show all (filtered) symbols */
3534         setup_pager();
3535 
3536         for (nd = rb_first_cached(&map->dso->symbol_names); nd;
3537              nd = rb_next(nd)) {
3538                 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3539 
3540                 if (strfilter__compare(_filter, pos->sym.name))
3541                         printf("%s\n", pos->sym.name);
3542         }
3543 end:
3544         map__put(map);
3545         exit_probe_symbol_maps();
3546 
3547         return ret;
3548 }
3549 
3550 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3551                             struct perf_probe_arg *pvar)
3552 {
3553         tvar->value = strdup(pvar->var);
3554         if (tvar->value == NULL)
3555                 return -ENOMEM;
3556         if (pvar->type) {
3557                 tvar->type = strdup(pvar->type);
3558                 if (tvar->type == NULL)
3559                         return -ENOMEM;
3560         }
3561         if (pvar->name) {
3562                 tvar->name = strdup(pvar->name);
3563                 if (tvar->name == NULL)
3564                         return -ENOMEM;
3565         } else
3566                 tvar->name = NULL;
3567         return 0;
3568 }
/* [<][>][^][v][top][bottom][index][help] */
root/tools/perf/util/probe-event.c

DEFINITIONS
