tools/perf/util/probe-event.c

   1 /*
   2  * probe-event.c : perf-probe definition to probe_events format converter
   3  *
   4  * Written by Masami Hiramatsu <mhiramat@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  */
  21
  22 #define _GNU_SOURCE
  23 #include <sys/utsname.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <stdarg.h>
  33 #include <limits.h>
  34 #include <elf.h>
  35
  36 #undef _GNU_SOURCE
  37 #include "util.h"
  38 #include "event.h"
  39 #include "string.h"
  40 #include "strlist.h"
  41 #include "debug.h"
  42 #include "cache.h"
  43 #include "color.h"
  44 #include "symbol.h"
  45 #include "thread.h"
  46 #include "debugfs.h"
  47 #include "trace-event.h"        /* For __unused */
  48 #include "probe-event.h"
  49 #include "probe-finder.h"
  50
  51 #define MAX_CMDLEN 256
  52 #define MAX_PROBE_ARGS 128
  53 #define PERFPROBE_GROUP "probe"
  54
  55 bool probe_event_dry_run;       /* Dry run flag */
  56
  57 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
  58
  59 /* If there is no space to write, returns -E2BIG. */
  60 static int e_snprintf(char *str, size_t size, const char *format, ...)
  61         __attribute__((format(printf, 3, 4)));
  62
  63 static int e_snprintf(char *str, size_t size, const char *format, ...)
  64 {
  65         int ret;
  66         va_list ap;
  67         va_start(ap, format);
  68         ret = vsnprintf(str, size, format, ap);
  69         va_end(ap);
  70         if (ret >= (int)size)
  71                 ret = -E2BIG;
  72         return ret;
  73 }
  74
  75 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
  76 static struct machine machine;
  77
  78 /* Initialize symbol maps and path of vmlinux/modules */
  79 static int init_vmlinux(void)
  80 {
  81         int ret;
  82
  83         symbol_conf.sort_by_name = true;
  84         if (symbol_conf.vmlinux_name == NULL)
  85                 symbol_conf.try_vmlinux_path = true;
  86         else
  87                 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
  88         ret = symbol__init();
  89         if (ret < 0) {
  90                 pr_debug("Failed to init symbol map.\n");
  91                 goto out;
  92         }
  93
  94         ret = machine__init(&machine, "", HOST_KERNEL_ID);
  95         if (ret < 0)
  96                 goto out;
  97
  98         if (machine__create_kernel_maps(&machine) < 0) {
  99                 pr_debug("machine__create_kernel_maps() failed.\n");
 100                 goto out;
 101         }
 102 out:
 103         if (ret < 0)
 104                 pr_warning("Failed to init vmlinux path.\n");
 105         return ret;
 106 }
 107
 108 static struct symbol *__find_kernel_function_by_name(const char *name,
 109                                                      struct map **mapp)
 110 {
 111         return machine__find_kernel_function_by_name(&machine, name, mapp,
 112                                                      NULL);
 113 }
 114
 115 static struct map *kernel_get_module_map(const char *module)
 116 {
 117         struct rb_node *nd;
 118         struct map_groups *grp = &machine.kmaps;
 119
 120         if (!module)
 121                 module = "kernel";
 122
 123         for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
 124                 struct map *pos = rb_entry(nd, struct map, rb_node);
 125                 if (strncmp(pos->dso->short_name + 1, module,
 126                             pos->dso->short_name_len - 2) == 0) {
 127                         return pos;
 128                 }
 129         }
 130         return NULL;
 131 }
 132
 133 static struct dso *kernel_get_module_dso(const char *module)
 134 {
 135         struct dso *dso;
 136         struct map *map;
 137         const char *vmlinux_name;
 138
 139         if (module) {
 140                 list_for_each_entry(dso, &machine.kernel_dsos, node) {
 141                         if (strncmp(dso->short_name + 1, module,
 142                                     dso->short_name_len - 2) == 0)
 143                                 goto found;
 144                 }
 145                 pr_debug("Failed to find module %s.\n", module);
 146                 return NULL;
 147         }
 148
 149         map = machine.vmlinux_maps[MAP__FUNCTION];
 150         dso = map->dso;
 151
 152         vmlinux_name = symbol_conf.vmlinux_name;
 153         if (vmlinux_name) {
 154                 if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0)
 155                         return NULL;
 156         } else {
 157                 if (dso__load_vmlinux_path(dso, map, NULL) <= 0) {
 158                         pr_debug("Failed to load kernel map.\n");
 159                         return NULL;
 160                 }
 161         }
 162 found:
 163         return dso;
 164 }
 165
 166 const char *kernel_get_module_path(const char *module)
 167 {
 168         struct dso *dso = kernel_get_module_dso(module);
 169         return (dso) ? dso->long_name : NULL;
 170 }
 171
 172 #ifdef DWARF_SUPPORT
 173 static int open_vmlinux(const char *module)
 174 {
 175         const char *path = kernel_get_module_path(module);
 176         if (!path) {
 177                 pr_err("Failed to find path of %s module.\n",
 178                        module ?: "kernel");
 179                 return -ENOENT;
 180         }
 181         pr_debug("Try to open %s\n", path);
 182         return open(path, O_RDONLY);
 183 }
 184
 185 /*
 186  * Convert trace point to probe point with debuginfo
 187  * Currently only handles kprobes.
 188  */
 189 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
 190                                         struct perf_probe_point *pp)
 191 {
 192         struct symbol *sym;
 193         struct map *map;
 194         u64 addr;
 195         int ret = -ENOENT;
 196
 197         sym = __find_kernel_function_by_name(tp->symbol, &map);
 198         if (sym) {
 199                 addr = map->unmap_ip(map, sym->start + tp->offset);
 200                 pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol,
 201                          tp->offset, addr);
 202                 ret = find_perf_probe_point((unsigned long)addr, pp);
 203         }
 204         if (ret <= 0) {
 205                 pr_debug("Failed to find corresponding probes from "
 206                          "debuginfo. Use kprobe event information.\n");
 207                 pp->function = strdup(tp->symbol);
 208                 if (pp->function == NULL)
 209                         return -ENOMEM;
 210                 pp->offset = tp->offset;
 211         }
 212         pp->retprobe = tp->retprobe;
 213
 214         return 0;
 215 }
 216
 217 /* Try to find perf_probe_event with debuginfo */
 218 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 219                                            struct probe_trace_event **tevs,
 220                                            int max_tevs, const char *module)
 221 {
 222         bool need_dwarf = perf_probe_event_need_dwarf(pev);
 223         int fd, ntevs;
 224
 225         fd = open_vmlinux(module);
 226         if (fd < 0) {
 227                 if (need_dwarf) {
 228                         pr_warning("Failed to open debuginfo file.\n");
 229                         return fd;
 230                 }
 231                 pr_debug("Could not open vmlinux. Try to use symbols.\n");
 232                 return 0;
 233         }
 234
 235         /* Searching trace events corresponding to probe event */
 236         ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs);
 237
 238         if (ntevs > 0) {        /* Succeeded to find trace events */
 239                 pr_debug("find %d probe_trace_events.\n", ntevs);
 240                 return ntevs;
 241         }
 242
 243         if (ntevs == 0) {       /* No error but failed to find probe point. */
 244                 pr_warning("Probe point '%s' not found.\n",
 245                            synthesize_perf_probe_point(&pev->point));
 246                 return -ENOENT;
 247         }
 248         /* Error path : ntevs < 0 */
 249         pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
 250         if (ntevs == -EBADF) {
 251                 pr_warning("Warning: No dwarf info found in the vmlinux - "
 252                         "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
 253                 if (!need_dwarf) {
 254                         pr_debug("Trying to use symbols.\n");
 255                         return 0;
 256                 }
 257         }
 258         return ntevs;
 259 }
 260
 261 /*
 262  * Find a src file from a DWARF tag path. Prepend optional source path prefix
 263  * and chop off leading directories that do not exist. Result is passed back as
 264  * a newly allocated path on success.
 265  * Return 0 if file was found and readable, -errno otherwise.
 266  */
 267 static int get_real_path(const char *raw_path, const char *comp_dir,
 268                          char **new_path)
 269 {
 270         const char *prefix = symbol_conf.source_prefix;
 271
 272         if (!prefix) {
 273                 if (raw_path[0] != '/' && comp_dir)
 274                         /* If not an absolute path, try to use comp_dir */
 275                         prefix = comp_dir;
 276                 else {
 277                         if (access(raw_path, R_OK) == 0) {
 278                                 *new_path = strdup(raw_path);
 279                                 return 0;
 280                         } else
 281                                 return -errno;
 282                 }
 283         }
 284
 285         *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
 286         if (!*new_path)
 287                 return -ENOMEM;
 288
 289         for (;;) {
 290                 sprintf(*new_path, "%s/%s", prefix, raw_path);
 291
 292                 if (access(*new_path, R_OK) == 0)
 293                         return 0;
 294
 295                 if (!symbol_conf.source_prefix)
 296                         /* In case of searching comp_dir, don't retry */
 297                         return -errno;
 298
 299                 switch (errno) {
 300                 case ENAMETOOLONG:
 301                 case ENOENT:
 302                 case EROFS:
 303                 case EFAULT:
 304                         raw_path = strchr(++raw_path, '/');
 305                         if (!raw_path) {
 306                                 free(*new_path);
 307                                 *new_path = NULL;
 308                                 return -ENOENT;
 309                         }
 310                         continue;
 311
 312                 default:
 313                         free(*new_path);
 314                         *new_path = NULL;
 315                         return -errno;
 316                 }
 317         }
 318 }
 319
 320 #define LINEBUF_SIZE 256
 321 #define NR_ADDITIONAL_LINES 2
 322
 323 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
 324 {
 325         char buf[LINEBUF_SIZE];
 326         const char *color = show_num ? "" : PERF_COLOR_BLUE;
 327         const char *prefix = NULL;
 328
 329         do {
 330                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 331                         goto error;
 332                 if (skip)
 333                         continue;
 334                 if (!prefix) {
 335                         prefix = show_num ? "%7d  " : "         ";
 336                         color_fprintf(stdout, color, prefix, l);
 337                 }
 338                 color_fprintf(stdout, color, "%s", buf);
 339
 340         } while (strchr(buf, '\n') == NULL);
 341
 342         return 1;
 343 error:
 344         if (ferror(fp)) {
 345                 pr_warning("File read error: %s\n", strerror(errno));
 346                 return -1;
 347         }
 348         return 0;
 349 }
 350
 351 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
 352 {
 353         int rv = __show_one_line(fp, l, skip, show_num);
 354         if (rv == 0) {
 355                 pr_warning("Source file is shorter than expected.\n");
 356                 rv = -1;
 357         }
 358         return rv;
 359 }
 360
 361 #define show_one_line_with_num(f,l)     _show_one_line(f,l,false,true)
 362 #define show_one_line(f,l)              _show_one_line(f,l,false,false)
 363 #define skip_one_line(f,l)              _show_one_line(f,l,true,false)
 364 #define show_one_line_or_eof(f,l)       __show_one_line(f,l,false,false)
 365
 366 /*
 367  * Show line-range always requires debuginfo to find source file and
 368  * line number.
 369  */
 370 int show_line_range(struct line_range *lr, const char *module)
 371 {
 372         int l = 1;
 373         struct line_node *ln;
 374         FILE *fp;
 375         int fd, ret;
 376         char *tmp;
 377
 378         /* Search a line range */
 379         ret = init_vmlinux();
 380         if (ret < 0)
 381                 return ret;
 382
 383         fd = open_vmlinux(module);
 384         if (fd < 0) {
 385                 pr_warning("Failed to open debuginfo file.\n");
 386                 return fd;
 387         }
 388
 389         ret = find_line_range(fd, lr);
 390         if (ret == 0) {
 391                 pr_warning("Specified source line is not found.\n");
 392                 return -ENOENT;
 393         } else if (ret < 0) {
 394                 pr_warning("Debuginfo analysis failed. (%d)\n", ret);
 395                 return ret;
 396         }
 397
 398         /* Convert source file path */
 399         tmp = lr->path;
 400         ret = get_real_path(tmp, lr->comp_dir, &lr->path);
 401         free(tmp);      /* Free old path */
 402         if (ret < 0) {
 403                 pr_warning("Failed to find source file. (%d)\n", ret);
 404                 return ret;
 405         }
 406
 407         setup_pager();
 408
 409         if (lr->function)
 410                 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
 411                         lr->start - lr->offset);
 412         else
 413                 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
 414
 415         fp = fopen(lr->path, "r");
 416         if (fp == NULL) {
 417                 pr_warning("Failed to open %s: %s\n", lr->path,
 418                            strerror(errno));
 419                 return -errno;
 420         }
 421         /* Skip to starting line number */
 422         while (l < lr->start) {
 423                 ret = skip_one_line(fp, l++);
 424                 if (ret < 0)
 425                         goto end;
 426         }
 427
 428         list_for_each_entry(ln, &lr->line_list, list) {
 429                 for (; ln->line > l; l++) {
 430                         ret = show_one_line(fp, l - lr->offset);
 431                         if (ret < 0)
 432                                 goto end;
 433                 }
 434                 ret = show_one_line_with_num(fp, l++ - lr->offset);
 435                 if (ret < 0)
 436                         goto end;
 437         }
 438
 439         if (lr->end == INT_MAX)
 440                 lr->end = l + NR_ADDITIONAL_LINES;
 441         while (l <= lr->end) {
 442                 ret = show_one_line_or_eof(fp, l++ - lr->offset);
 443                 if (ret <= 0)
 444                         break;
 445         }
 446 end:
 447         fclose(fp);
 448         return ret;
 449 }
 450
 451 static int show_available_vars_at(int fd, struct perf_probe_event *pev,
 452                                   int max_vls, struct strfilter *_filter,
 453                                   bool externs)
 454 {
 455         char *buf;
 456         int ret, i, nvars;
 457         struct str_node *node;
 458         struct variable_list *vls = NULL, *vl;
 459         const char *var;
 460
 461         buf = synthesize_perf_probe_point(&pev->point);
 462         if (!buf)
 463                 return -EINVAL;
 464         pr_debug("Searching variables at %s\n", buf);
 465
 466         ret = find_available_vars_at(fd, pev, &vls, max_vls, externs);
 467         if (ret <= 0) {
 468                 pr_err("Failed to find variables at %s (%d)\n", buf, ret);
 469                 goto end;
 470         }
 471         /* Some variables are found */
 472         fprintf(stdout, "Available variables at %s\n", buf);
 473         for (i = 0; i < ret; i++) {
 474                 vl = &vls[i];
 475                 /*
 476                  * A probe point might be converted to
 477                  * several trace points.
 478                  */
 479                 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
 480                         vl->point.offset);
 481                 free(vl->point.symbol);
 482                 nvars = 0;
 483                 if (vl->vars) {
 484                         strlist__for_each(node, vl->vars) {
 485                                 var = strchr(node->s, '\t') + 1;
 486                                 if (strfilter__compare(_filter, var)) {
 487                                         fprintf(stdout, "\t\t%s\n", node->s);
 488                                         nvars++;
 489                                 }
 490                         }
 491                         strlist__delete(vl->vars);
 492                 }
 493                 if (nvars == 0)
 494                         fprintf(stdout, "\t\t(No matched variables)\n");
 495         }
 496         free(vls);
 497 end:
 498         free(buf);
 499         return ret;
 500 }
 501
 502 /* Show available variables on given probe point */
 503 int show_available_vars(struct perf_probe_event *pevs, int npevs,
 504                         int max_vls, const char *module,
 505                         struct strfilter *_filter, bool externs)
 506 {
 507         int i, fd, ret = 0;
 508
 509         ret = init_vmlinux();
 510         if (ret < 0)
 511                 return ret;
 512
 513         setup_pager();
 514
 515         for (i = 0; i < npevs && ret >= 0; i++) {
 516                 fd = open_vmlinux(module);
 517                 if (fd < 0) {
 518                         pr_warning("Failed to open debug information file.\n");
 519                         ret = fd;
 520                         break;
 521                 }
 522                 ret = show_available_vars_at(fd, &pevs[i], max_vls, _filter,
 523                                              externs);
 524         }
 525         return ret;
 526 }
 527
 528 #else   /* !DWARF_SUPPORT */
 529
 530 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
 531                                         struct perf_probe_point *pp)
 532 {
 533         struct symbol *sym;
 534
 535         sym = __find_kernel_function_by_name(tp->symbol, NULL);
 536         if (!sym) {
 537                 pr_err("Failed to find symbol %s in kernel.\n", tp->symbol);
 538                 return -ENOENT;
 539         }
 540         pp->function = strdup(tp->symbol);
 541         if (pp->function == NULL)
 542                 return -ENOMEM;
 543         pp->offset = tp->offset;
 544         pp->retprobe = tp->retprobe;
 545
 546         return 0;
 547 }
 548
 549 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 550                                 struct probe_trace_event **tevs __unused,
 551                                 int max_tevs __unused, const char *mod __unused)
 552 {
 553         if (perf_probe_event_need_dwarf(pev)) {
 554                 pr_warning("Debuginfo-analysis is not supported.\n");
 555                 return -ENOSYS;
 556         }
 557         return 0;
 558 }
 559
 560 int show_line_range(struct line_range *lr __unused, const char *module __unused)
 561 {
 562         pr_warning("Debuginfo-analysis is not supported.\n");
 563         return -ENOSYS;
 564 }
 565
 566 int show_available_vars(struct perf_probe_event *pevs __unused,
 567                         int npevs __unused, int max_vls __unused,
 568                         const char *module __unused,
 569                         struct strfilter *filter __unused,
 570                         bool externs __unused)
 571 {
 572         pr_warning("Debuginfo-analysis is not supported.\n");
 573         return -ENOSYS;
 574 }
 575 #endif
 576
 577 static int parse_line_num(char **ptr, int *val, const char *what)
 578 {
 579         const char *start = *ptr;
 580
 581         errno = 0;
 582         *val = strtol(*ptr, ptr, 0);
 583         if (errno || *ptr == start) {
 584                 semantic_error("'%s' is not a valid number.\n", what);
 585                 return -EINVAL;
 586         }
 587         return 0;
 588 }
 589
 590 /*
 591  * Stuff 'lr' according to the line range described by 'arg'.
 592  * The line range syntax is described by:
 593  *
 594  *         SRC[:SLN[+NUM|-ELN]]
 595  *         FNC[@SRC][:SLN[+NUM|-ELN]]
 596  */
 597 int parse_line_range_desc(const char *arg, struct line_range *lr)
 598 {
 599         char *range, *file, *name = strdup(arg);
 600         int err;
 601
 602         if (!name)
 603                 return -ENOMEM;
 604
 605         lr->start = 0;
 606         lr->end = INT_MAX;
 607
 608         range = strchr(name, ':');
 609         if (range) {
 610                 *range++ = '\0';
 611
 612                 err = parse_line_num(&range, &lr->start, "start line");
 613                 if (err)
 614                         goto err;
 615
 616                 if (*range == '+' || *range == '-') {
 617                         const char c = *range++;
 618
 619                         err = parse_line_num(&range, &lr->end, "end line");
 620                         if (err)
 621                                 goto err;
 622
 623                         if (c == '+') {
 624                                 lr->end += lr->start;
 625                                 /*
 626                                  * Adjust the number of lines here.
 627                                  * If the number of lines == 1, the
 628                                  * the end of line should be equal to
 629                                  * the start of line.
 630                                  */
 631                                 lr->end--;
 632                         }
 633                 }
 634
 635                 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
 636
 637                 err = -EINVAL;
 638                 if (lr->start > lr->end) {
 639                         semantic_error("Start line must be smaller"
 640                                        " than end line.\n");
 641                         goto err;
 642                 }
 643                 if (*range != '\0') {
 644                         semantic_error("Tailing with invalid str '%s'.\n", range);
 645                         goto err;
 646                 }
 647         }
 648
 649         file = strchr(name, '@');
 650         if (file) {
 651                 *file = '\0';
 652                 lr->file = strdup(++file);
 653                 if (lr->file == NULL) {
 654                         err = -ENOMEM;
 655                         goto err;
 656                 }
 657                 lr->function = name;
 658         } else if (strchr(name, '.'))
 659                 lr->file = name;
 660         else
 661                 lr->function = name;
 662
 663         return 0;
 664 err:
 665         free(name);
 666         return err;
 667 }
 668
 669 /* Check the name is good for event/group */
 670 static bool check_event_name(const char *name)
 671 {
 672         if (!isalpha(*name) && *name != '_')
 673                 return false;
 674         while (*++name != '\0') {
 675                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 676                         return false;
 677         }
 678         return true;
 679 }
 680
 681 /* Parse probepoint definition. */
 682 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 683 {
 684         struct perf_probe_point *pp = &pev->point;
 685         char *ptr, *tmp;
 686         char c, nc = 0;
 687         /*
 688          * <Syntax>
 689          * perf probe [EVENT=]SRC[:LN|;PTN]
 690          * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
 691          *
 692          * TODO:Group name support
 693          */
 694
 695         ptr = strpbrk(arg, ";=@+%");
 696         if (ptr && *ptr == '=') {       /* Event name */
 697                 *ptr = '\0';
 698                 tmp = ptr + 1;
 699                 if (strchr(arg, ':')) {
 700                         semantic_error("Group name is not supported yet.\n");
 701                         return -ENOTSUP;
 702                 }
 703                 if (!check_event_name(arg)) {
 704                         semantic_error("%s is bad for event name -it must "
 705                                        "follow C symbol-naming rule.\n", arg);
 706                         return -EINVAL;
 707                 }
 708                 pev->event = strdup(arg);
 709                 if (pev->event == NULL)
 710                         return -ENOMEM;
 711                 pev->group = NULL;
 712                 arg = tmp;
 713         }
 714
 715         ptr = strpbrk(arg, ";:+@%");
 716         if (ptr) {
 717                 nc = *ptr;
 718                 *ptr++ = '\0';
 719         }
 720
 721         tmp = strdup(arg);
 722         if (tmp == NULL)
 723                 return -ENOMEM;
 724
 725         /* Check arg is function or file and copy it */
 726         if (strchr(tmp, '.'))   /* File */
 727                 pp->file = tmp;
 728         else                    /* Function */
 729                 pp->function = tmp;
 730
 731         /* Parse other options */
 732         while (ptr) {
 733                 arg = ptr;
 734                 c = nc;
 735                 if (c == ';') { /* Lazy pattern must be the last part */
 736                         pp->lazy_line = strdup(arg);
 737                         if (pp->lazy_line == NULL)
 738                                 return -ENOMEM;
 739                         break;
 740                 }
 741                 ptr = strpbrk(arg, ";:+@%");
 742                 if (ptr) {
 743                         nc = *ptr;
 744                         *ptr++ = '\0';
 745                 }
 746                 switch (c) {
 747                 case ':':       /* Line number */
 748                         pp->line = strtoul(arg, &tmp, 0);
 749                         if (*tmp != '\0') {
 750                                 semantic_error("There is non-digit char"
 751                                                " in line number.\n");
 752                                 return -EINVAL;
 753                         }
 754                         break;
 755                 case '+':       /* Byte offset from a symbol */
 756                         pp->offset = strtoul(arg, &tmp, 0);
 757                         if (*tmp != '\0') {
 758                                 semantic_error("There is non-digit character"
 759                                                 " in offset.\n");
 760                                 return -EINVAL;
 761                         }
 762                         break;
 763                 case '@':       /* File name */
 764                         if (pp->file) {
 765                                 semantic_error("SRC@SRC is not allowed.\n");
 766                                 return -EINVAL;
 767                         }
 768                         pp->file = strdup(arg);
 769                         if (pp->file == NULL)
 770                                 return -ENOMEM;
 771                         break;
 772                 case '%':       /* Probe places */
 773                         if (strcmp(arg, "return") == 0) {
 774                                 pp->retprobe = 1;
 775                         } else {        /* Others not supported yet */
 776                                 semantic_error("%%%s is not supported.\n", arg);
 777                                 return -ENOTSUP;
 778                         }
 779                         break;
 780                 default:        /* Buggy case */
 781                         pr_err("This program has a bug at %s:%d.\n",
 782                                 __FILE__, __LINE__);
 783                         return -ENOTSUP;
 784                         break;
 785                 }
 786         }
 787
 788         /* Exclusion check */
 789         if (pp->lazy_line && pp->line) {
 790                 semantic_error("Lazy pattern can't be used with"
 791                                " line number.\n");
 792                 return -EINVAL;
 793         }
 794
 795         if (pp->lazy_line && pp->offset) {
 796                 semantic_error("Lazy pattern can't be used with offset.\n");
 797                 return -EINVAL;
 798         }
 799
 800         if (pp->line && pp->offset) {
 801                 semantic_error("Offset can't be used with line number.\n");
 802                 return -EINVAL;
 803         }
 804
 805         if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
 806                 semantic_error("File always requires line number or "
 807                                "lazy pattern.\n");
 808                 return -EINVAL;
 809         }
 810
 811         if (pp->offset && !pp->function) {
 812                 semantic_error("Offset requires an entry function.\n");
 813                 return -EINVAL;
 814         }
 815
 816         if (pp->retprobe && !pp->function) {
 817                 semantic_error("Return probe requires an entry function.\n");
 818                 return -EINVAL;
 819         }
 820
 821         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
 822                 semantic_error("Offset/Line/Lazy pattern can't be used with "
 823                                "return probe.\n");
 824                 return -EINVAL;
 825         }
 826
 827         pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
 828                  pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
 829                  pp->lazy_line);
 830         return 0;
 831 }
 832
 833 /* Parse perf-probe event argument */
 834 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
 835 {
 836         char *tmp, *goodname;
 837         struct perf_probe_arg_field **fieldp;
 838
 839         pr_debug("parsing arg: %s into ", str);
 840
 841         tmp = strchr(str, '=');
 842         if (tmp) {
 843                 arg->name = strndup(str, tmp - str);
 844                 if (arg->name == NULL)
 845                         return -ENOMEM;
 846                 pr_debug("name:%s ", arg->name);
 847                 str = tmp + 1;
 848         }
 849
 850         tmp = strchr(str, ':');
 851         if (tmp) {      /* Type setting */
 852                 *tmp = '\0';
 853                 arg->type = strdup(tmp + 1);
 854                 if (arg->type == NULL)
 855                         return -ENOMEM;
 856                 pr_debug("type:%s ", arg->type);
 857         }
 858
 859         tmp = strpbrk(str, "-.[");
 860         if (!is_c_varname(str) || !tmp) {
 861                 /* A variable, register, symbol or special value */
 862                 arg->var = strdup(str);
 863                 if (arg->var == NULL)
 864                         return -ENOMEM;
 865                 pr_debug("%s\n", arg->var);
 866                 return 0;
 867         }
 868
 869         /* Structure fields or array element */
 870         arg->var = strndup(str, tmp - str);
 871         if (arg->var == NULL)
 872                 return -ENOMEM;
 873         goodname = arg->var;
 874         pr_debug("%s, ", arg->var);
 875         fieldp = &arg->field;
 876
 877         do {
 878                 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
 879                 if (*fieldp == NULL)
 880                         return -ENOMEM;
 881                 if (*tmp == '[') {      /* Array */
 882                         str = tmp;
 883                         (*fieldp)->index = strtol(str + 1, &tmp, 0);
 884                         (*fieldp)->ref = true;
 885                         if (*tmp != ']' || tmp == str + 1) {
 886                                 semantic_error("Array index must be a"
 887                                                 " number.\n");
 888                                 return -EINVAL;
 889                         }
 890                         tmp++;
 891                         if (*tmp == '\0')
 892                                 tmp = NULL;
 893                 } else {                /* Structure */
 894                         if (*tmp == '.') {
 895                                 str = tmp + 1;
 896                                 (*fieldp)->ref = false;
 897                         } else if (tmp[1] == '>') {
 898                                 str = tmp + 2;
 899                                 (*fieldp)->ref = true;
 900                         } else {
 901                                 semantic_error("Argument parse error: %s\n",
 902                                                str);
 903                                 return -EINVAL;
 904                         }
 905                         tmp = strpbrk(str, "-.[");
 906                 }
 907                 if (tmp) {
 908                         (*fieldp)->name = strndup(str, tmp - str);
 909                         if ((*fieldp)->name == NULL)
 910                                 return -ENOMEM;
 911                         if (*str != '[')
 912                                 goodname = (*fieldp)->name;
 913                         pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
 914                         fieldp = &(*fieldp)->next;
 915                 }
 916         } while (tmp);
 917         (*fieldp)->name = strdup(str);
 918         if ((*fieldp)->name == NULL)
 919                 return -ENOMEM;
 920         if (*str != '[')
 921                 goodname = (*fieldp)->name;
 922         pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
 923
 924         /* If no name is specified, set the last field name (not array index)*/
 925         if (!arg->name) {
 926                 arg->name = strdup(goodname);
 927                 if (arg->name == NULL)
 928                         return -ENOMEM;
 929         }
 930         return 0;
 931 }
 932
 933 /* Parse perf-probe event command */
 934 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
 935 {
 936         char **argv;
 937         int argc, i, ret = 0;
 938
 939         argv = argv_split(cmd, &argc);
 940         if (!argv) {
 941                 pr_debug("Failed to split arguments.\n");
 942                 return -ENOMEM;
 943         }
 944         if (argc - 1 > MAX_PROBE_ARGS) {
 945                 semantic_error("Too many probe arguments (%d).\n", argc - 1);
 946                 ret = -ERANGE;
 947                 goto out;
 948         }
 949         /* Parse probe point */
 950         ret = parse_perf_probe_point(argv[0], pev);
 951         if (ret < 0)
 952                 goto out;
 953
 954         /* Copy arguments and ensure return probe has no C argument */
 955         pev->nargs = argc - 1;
 956         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
 957         if (pev->args == NULL) {
 958                 ret = -ENOMEM;
 959                 goto out;
 960         }
 961         for (i = 0; i < pev->nargs && ret >= 0; i++) {
 962                 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
 963                 if (ret >= 0 &&
 964                     is_c_varname(pev->args[i].var) && pev->point.retprobe) {
 965                         semantic_error("You can't specify local variable for"
 966                                        " kretprobe.\n");
 967                         ret = -EINVAL;
 968                 }
 969         }
 970 out:
 971         argv_free(argv);
 972
 973         return ret;
 974 }
 975
 976 /* Return true if this perf_probe_event requires debuginfo */
 977 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
 978 {
 979         int i;
 980
 981         if (pev->point.file || pev->point.line || pev->point.lazy_line)
 982                 return true;
 983
 984         for (i = 0; i < pev->nargs; i++)
 985                 if (is_c_varname(pev->args[i].var))
 986                         return true;
 987
 988         return false;
 989 }
 990
 991 /* Parse probe_events event into struct probe_point */
 992 static int parse_probe_trace_command(const char *cmd,
 993                                         struct probe_trace_event *tev)
 994 {
 995         struct probe_trace_point *tp = &tev->point;
 996         char pr;
 997         char *p;
 998         int ret, i, argc;
 999         char **argv;
1000
1001         pr_debug("Parsing probe_events: %s\n", cmd);
1002         argv = argv_split(cmd, &argc);
1003         if (!argv) {
1004                 pr_debug("Failed to split arguments.\n");
1005                 return -ENOMEM;
1006         }
1007         if (argc < 2) {
1008                 semantic_error("Too few probe arguments.\n");
1009                 ret = -ERANGE;
1010                 goto out;
1011         }
1012
1013         /* Scan event and group name. */
1014         ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
1015                      &pr, (float *)(void *)&tev->group,
1016                      (float *)(void *)&tev->event);
1017         if (ret != 3) {
1018                 semantic_error("Failed to parse event name: %s\n", argv[0]);
1019                 ret = -EINVAL;
1020                 goto out;
1021         }
1022         pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1023
1024         tp->retprobe = (pr == 'r');
1025
1026         /* Scan function name and offset */
1027         ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
1028                      &tp->offset);
1029         if (ret == 1)
1030                 tp->offset = 0;
1031
1032         tev->nargs = argc - 2;
1033         tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1034         if (tev->args == NULL) {
1035                 ret = -ENOMEM;
1036                 goto out;
1037         }
1038         for (i = 0; i < tev->nargs; i++) {
1039                 p = strchr(argv[i + 2], '=');
1040                 if (p)  /* We don't need which register is assigned. */
1041                         *p++ = '\0';
1042                 else
1043                         p = argv[i + 2];
1044                 tev->args[i].name = strdup(argv[i + 2]);
1045                 /* TODO: parse regs and offset */
1046                 tev->args[i].value = strdup(p);
1047                 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1048                         ret = -ENOMEM;
1049                         goto out;
1050                 }
1051         }
1052         ret = 0;
1053 out:
1054         argv_free(argv);
1055         return ret;
1056 }
1057
1058 /* Compose only probe arg */
1059 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
1060 {
1061         struct perf_probe_arg_field *field = pa->field;
1062         int ret;
1063         char *tmp = buf;
1064
1065         if (pa->name && pa->var)
1066                 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
1067         else
1068                 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
1069         if (ret <= 0)
1070                 goto error;
1071         tmp += ret;
1072         len -= ret;
1073
1074         while (field) {
1075                 if (field->name[0] == '[')
1076                         ret = e_snprintf(tmp, len, "%s", field->name);
1077                 else
1078                         ret = e_snprintf(tmp, len, "%s%s",
1079                                          field->ref ? "->" : ".", field->name);
1080                 if (ret <= 0)
1081                         goto error;
1082                 tmp += ret;
1083                 len -= ret;
1084                 field = field->next;
1085         }
1086
1087         if (pa->type) {
1088                 ret = e_snprintf(tmp, len, ":%s", pa->type);
1089                 if (ret <= 0)
1090                         goto error;
1091                 tmp += ret;
1092                 len -= ret;
1093         }
1094
1095         return tmp - buf;
1096 error:
1097         pr_debug("Failed to synthesize perf probe argument: %s\n",
1098                  strerror(-ret));
1099         return ret;
1100 }
1101
1102 /* Compose only probe point (not argument) */
1103 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1104 {
1105         char *buf, *tmp;
1106         char offs[32] = "", line[32] = "", file[32] = "";
1107         int ret, len;
1108
1109         buf = zalloc(MAX_CMDLEN);
1110         if (buf == NULL) {
1111                 ret = -ENOMEM;
1112                 goto error;
1113         }
1114         if (pp->offset) {
1115                 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
1116                 if (ret <= 0)
1117                         goto error;
1118         }
1119         if (pp->line) {
1120                 ret = e_snprintf(line, 32, ":%d", pp->line);
1121                 if (ret <= 0)
1122                         goto error;
1123         }
1124         if (pp->file) {
1125                 tmp = pp->file;
1126                 len = strlen(tmp);
1127                 if (len > 30) {
1128                         tmp = strchr(pp->file + len - 30, '/');
1129                         tmp = tmp ? tmp + 1 : pp->file + len - 30;
1130                 }
1131                 ret = e_snprintf(file, 32, "@%s", tmp);
1132                 if (ret <= 0)
1133                         goto error;
1134         }
1135
1136         if (pp->function)
1137                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
1138                                  offs, pp->retprobe ? "%return" : "", line,
1139                                  file);
1140         else
1141                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
1142         if (ret <= 0)
1143                 goto error;
1144
1145         return buf;
1146 error:
1147         pr_debug("Failed to synthesize perf probe point: %s\n",
1148                  strerror(-ret));
1149         if (buf)
1150                 free(buf);
1151         return NULL;
1152 }
1153
1154 #if 0
1155 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1156 {
1157         char *buf;
1158         int i, len, ret;
1159
1160         buf = synthesize_perf_probe_point(&pev->point);
1161         if (!buf)
1162                 return NULL;
1163
1164         len = strlen(buf);
1165         for (i = 0; i < pev->nargs; i++) {
1166                 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
1167                                  pev->args[i].name);
1168                 if (ret <= 0) {
1169                         free(buf);
1170                         return NULL;
1171                 }
1172                 len += ret;
1173         }
1174
1175         return buf;
1176 }
1177 #endif
1178
1179 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1180                                              char **buf, size_t *buflen,
1181                                              int depth)
1182 {
1183         int ret;
1184         if (ref->next) {
1185                 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1186                                                          buflen, depth + 1);
1187                 if (depth < 0)
1188                         goto out;
1189         }
1190
1191         ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
1192         if (ret < 0)
1193                 depth = ret;
1194         else {
1195                 *buf += ret;
1196                 *buflen -= ret;
1197         }
1198 out:
1199         return depth;
1200
1201 }
1202
1203 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1204                                        char *buf, size_t buflen)
1205 {
1206         struct probe_trace_arg_ref *ref = arg->ref;
1207         int ret, depth = 0;
1208         char *tmp = buf;
1209
1210         /* Argument name or separator */
1211         if (arg->name)
1212                 ret = e_snprintf(buf, buflen, " %s=", arg->name);
1213         else
1214                 ret = e_snprintf(buf, buflen, " ");
1215         if (ret < 0)
1216                 return ret;
1217         buf += ret;
1218         buflen -= ret;
1219
1220         /* Special case: @XXX */
1221         if (arg->value[0] == '@' && arg->ref)
1222                         ref = ref->next;
1223
1224         /* Dereferencing arguments */
1225         if (ref) {
1226                 depth = __synthesize_probe_trace_arg_ref(ref, &buf,
1227                                                           &buflen, 1);
1228                 if (depth < 0)
1229                         return depth;
1230         }
1231
1232         /* Print argument value */
1233         if (arg->value[0] == '@' && arg->ref)
1234                 ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
1235                                  arg->ref->offset);
1236         else
1237                 ret = e_snprintf(buf, buflen, "%s", arg->value);
1238         if (ret < 0)
1239                 return ret;
1240         buf += ret;
1241         buflen -= ret;
1242
1243         /* Closing */
1244         while (depth--) {
1245                 ret = e_snprintf(buf, buflen, ")");
1246                 if (ret < 0)
1247                         return ret;
1248                 buf += ret;
1249                 buflen -= ret;
1250         }
1251         /* Print argument type */
1252         if (arg->type) {
1253                 ret = e_snprintf(buf, buflen, ":%s", arg->type);
1254                 if (ret <= 0)
1255                         return ret;
1256                 buf += ret;
1257         }
1258
1259         return buf - tmp;
1260 }
1261
1262 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1263 {
1264         struct probe_trace_point *tp = &tev->point;
1265         char *buf;
1266         int i, len, ret;
1267
1268         buf = zalloc(MAX_CMDLEN);
1269         if (buf == NULL)
1270                 return NULL;
1271
1272         len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
1273                          tp->retprobe ? 'r' : 'p',
1274                          tev->group, tev->event,
1275                          tp->symbol, tp->offset);
1276         if (len <= 0)
1277                 goto error;
1278
1279         for (i = 0; i < tev->nargs; i++) {
1280                 ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
1281                                                   MAX_CMDLEN - len);
1282                 if (ret <= 0)
1283                         goto error;
1284                 len += ret;
1285         }
1286
1287         return buf;
1288 error:
1289         free(buf);
1290         return NULL;
1291 }
1292
1293 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1294                                        struct perf_probe_event *pev)
1295 {
1296         char buf[64] = "";
1297         int i, ret;
1298
1299         /* Convert event/group name */
1300         pev->event = strdup(tev->event);
1301         pev->group = strdup(tev->group);
1302         if (pev->event == NULL || pev->group == NULL)
1303                 return -ENOMEM;
1304
1305         /* Convert trace_point to probe_point */
1306         ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point);
1307         if (ret < 0)
1308                 return ret;
1309
1310         /* Convert trace_arg to probe_arg */
1311         pev->nargs = tev->nargs;
1312         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1313         if (pev->args == NULL)
1314                 return -ENOMEM;
1315         for (i = 0; i < tev->nargs && ret >= 0; i++) {
1316                 if (tev->args[i].name)
1317                         pev->args[i].name = strdup(tev->args[i].name);
1318                 else {
1319                         ret = synthesize_probe_trace_arg(&tev->args[i],
1320                                                           buf, 64);
1321                         pev->args[i].name = strdup(buf);
1322                 }
1323                 if (pev->args[i].name == NULL && ret >= 0)
1324                         ret = -ENOMEM;
1325         }
1326
1327         if (ret < 0)
1328                 clear_perf_probe_event(pev);
1329
1330         return ret;
1331 }
1332
1333 void clear_perf_probe_event(struct perf_probe_event *pev)
1334 {
1335         struct perf_probe_point *pp = &pev->point;
1336         struct perf_probe_arg_field *field, *next;
1337         int i;
1338
1339         if (pev->event)
1340                 free(pev->event);
1341         if (pev->group)
1342                 free(pev->group);
1343         if (pp->file)
1344                 free(pp->file);
1345         if (pp->function)
1346                 free(pp->function);
1347         if (pp->lazy_line)
1348                 free(pp->lazy_line);
1349         for (i = 0; i < pev->nargs; i++) {
1350                 if (pev->args[i].name)
1351                         free(pev->args[i].name);
1352                 if (pev->args[i].var)
1353                         free(pev->args[i].var);
1354                 if (pev->args[i].type)
1355                         free(pev->args[i].type);
1356                 field = pev->args[i].field;
1357                 while (field) {
1358                         next = field->next;
1359                         if (field->name)
1360                                 free(field->name);
1361                         free(field);
1362                         field = next;
1363                 }
1364         }
1365         if (pev->args)
1366                 free(pev->args);
1367         memset(pev, 0, sizeof(*pev));
1368 }
1369
1370 static void clear_probe_trace_event(struct probe_trace_event *tev)
1371 {
1372         struct probe_trace_arg_ref *ref, *next;
1373         int i;
1374
1375         if (tev->event)
1376                 free(tev->event);
1377         if (tev->group)
1378                 free(tev->group);
1379         if (tev->point.symbol)
1380                 free(tev->point.symbol);
1381         for (i = 0; i < tev->nargs; i++) {
1382                 if (tev->args[i].name)
1383                         free(tev->args[i].name);
1384                 if (tev->args[i].value)
1385                         free(tev->args[i].value);
1386                 if (tev->args[i].type)
1387                         free(tev->args[i].type);
1388                 ref = tev->args[i].ref;
1389                 while (ref) {
1390                         next = ref->next;
1391                         free(ref);
1392                         ref = next;
1393                 }
1394         }
1395         if (tev->args)
1396                 free(tev->args);
1397         memset(tev, 0, sizeof(*tev));
1398 }
1399
1400 static int open_kprobe_events(bool readwrite)
1401 {
1402         char buf[PATH_MAX];
1403         const char *__debugfs;
1404         int ret;
1405
1406         __debugfs = debugfs_find_mountpoint();
1407         if (__debugfs == NULL) {
1408                 pr_warning("Debugfs is not mounted.\n");
1409                 return -ENOENT;
1410         }
1411
1412         ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
1413         if (ret >= 0) {
1414                 pr_debug("Opening %s write=%d\n", buf, readwrite);
1415                 if (readwrite && !probe_event_dry_run)
1416                         ret = open(buf, O_RDWR, O_APPEND);
1417                 else
1418                         ret = open(buf, O_RDONLY, 0);
1419         }
1420
1421         if (ret < 0) {
1422                 if (errno == ENOENT)
1423                         pr_warning("kprobe_events file does not exist - please"
1424                                  " rebuild kernel with CONFIG_KPROBE_EVENT.\n");
1425                 else
1426                         pr_warning("Failed to open kprobe_events file: %s\n",
1427                                    strerror(errno));
1428         }
1429         return ret;
1430 }
1431
1432 /* Get raw string list of current kprobe_events */
1433 static struct strlist *get_probe_trace_command_rawlist(int fd)
1434 {
1435         int ret, idx;
1436         FILE *fp;
1437         char buf[MAX_CMDLEN];
1438         char *p;
1439         struct strlist *sl;
1440
1441         sl = strlist__new(true, NULL);
1442
1443         fp = fdopen(dup(fd), "r");
1444         while (!feof(fp)) {
1445                 p = fgets(buf, MAX_CMDLEN, fp);
1446                 if (!p)
1447                         break;
1448
1449                 idx = strlen(p) - 1;
1450                 if (p[idx] == '\n')
1451                         p[idx] = '\0';
1452                 ret = strlist__add(sl, buf);
1453                 if (ret < 0) {
1454                         pr_debug("strlist__add failed: %s\n", strerror(-ret));
1455                         strlist__delete(sl);
1456                         return NULL;
1457                 }
1458         }
1459         fclose(fp);
1460
1461         return sl;
1462 }
1463
1464 /* Show an event */
1465 static int show_perf_probe_event(struct perf_probe_event *pev)
1466 {
1467         int i, ret;
1468         char buf[128];
1469         char *place;
1470
1471         /* Synthesize only event probe point */
1472         place = synthesize_perf_probe_point(&pev->point);
1473         if (!place)
1474                 return -EINVAL;
1475
1476         ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1477         if (ret < 0)
1478                 return ret;
1479
1480         printf("  %-20s (on %s", buf, place);
1481
1482         if (pev->nargs > 0) {
1483                 printf(" with");
1484                 for (i = 0; i < pev->nargs; i++) {
1485                         ret = synthesize_perf_probe_arg(&pev->args[i],
1486                                                         buf, 128);
1487                         if (ret < 0)
1488                                 break;
1489                         printf(" %s", buf);
1490                 }
1491         }
1492         printf(")\n");
1493         free(place);
1494         return ret;
1495 }
1496
1497 /* List up current perf-probe events */
1498 int show_perf_probe_events(void)
1499 {
1500         int fd, ret;
1501         struct probe_trace_event tev;
1502         struct perf_probe_event pev;
1503         struct strlist *rawlist;
1504         struct str_node *ent;
1505
1506         setup_pager();
1507         ret = init_vmlinux();
1508         if (ret < 0)
1509                 return ret;
1510
1511         memset(&tev, 0, sizeof(tev));
1512         memset(&pev, 0, sizeof(pev));
1513
1514         fd = open_kprobe_events(false);
1515         if (fd < 0)
1516                 return fd;
1517
1518         rawlist = get_probe_trace_command_rawlist(fd);
1519         close(fd);
1520         if (!rawlist)
1521                 return -ENOENT;
1522
1523         strlist__for_each(ent, rawlist) {
1524                 ret = parse_probe_trace_command(ent->s, &tev);
1525                 if (ret >= 0) {
1526                         ret = convert_to_perf_probe_event(&tev, &pev);
1527                         if (ret >= 0)
1528                                 ret = show_perf_probe_event(&pev);
1529                 }
1530                 clear_perf_probe_event(&pev);
1531                 clear_probe_trace_event(&tev);
1532                 if (ret < 0)
1533                         break;
1534         }
1535         strlist__delete(rawlist);
1536
1537         return ret;
1538 }
1539
1540 /* Get current perf-probe event names */
1541 static struct strlist *get_probe_trace_event_names(int fd, bool include_group)
1542 {
1543         char buf[128];
1544         struct strlist *sl, *rawlist;
1545         struct str_node *ent;
1546         struct probe_trace_event tev;
1547         int ret = 0;
1548
1549         memset(&tev, 0, sizeof(tev));
1550         rawlist = get_probe_trace_command_rawlist(fd);
1551         sl = strlist__new(true, NULL);
1552         strlist__for_each(ent, rawlist) {
1553                 ret = parse_probe_trace_command(ent->s, &tev);
1554                 if (ret < 0)
1555                         break;
1556                 if (include_group) {
1557                         ret = e_snprintf(buf, 128, "%s:%s", tev.group,
1558                                         tev.event);
1559                         if (ret >= 0)
1560                                 ret = strlist__add(sl, buf);
1561                 } else
1562                         ret = strlist__add(sl, tev.event);
1563                 clear_probe_trace_event(&tev);
1564                 if (ret < 0)
1565                         break;
1566         }
1567         strlist__delete(rawlist);
1568
1569         if (ret < 0) {
1570                 strlist__delete(sl);
1571                 return NULL;
1572         }
1573         return sl;
1574 }
1575
1576 static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
1577 {
1578         int ret = 0;
1579         char *buf = synthesize_probe_trace_command(tev);
1580
1581         if (!buf) {
1582                 pr_debug("Failed to synthesize probe trace event.\n");
1583                 return -EINVAL;
1584         }
1585
1586         pr_debug("Writing event: %s\n", buf);
1587         if (!probe_event_dry_run) {
1588                 ret = write(fd, buf, strlen(buf));
1589                 if (ret <= 0)
1590                         pr_warning("Failed to write event: %s\n",
1591                                    strerror(errno));
1592         }
1593         free(buf);
1594         return ret;
1595 }
1596
1597 static int get_new_event_name(char *buf, size_t len, const char *base,
1598                               struct strlist *namelist, bool allow_suffix)
1599 {
1600         int i, ret;
1601
1602         /* Try no suffix */
1603         ret = e_snprintf(buf, len, "%s", base);
1604         if (ret < 0) {
1605                 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1606                 return ret;
1607         }
1608         if (!strlist__has_entry(namelist, buf))
1609                 return 0;
1610
1611         if (!allow_suffix) {
1612                 pr_warning("Error: event \"%s\" already exists. "
1613                            "(Use -f to force duplicates.)\n", base);
1614                 return -EEXIST;
1615         }
1616
1617         /* Try to add suffix */
1618         for (i = 1; i < MAX_EVENT_INDEX; i++) {
1619                 ret = e_snprintf(buf, len, "%s_%d", base, i);
1620                 if (ret < 0) {
1621                         pr_debug("snprintf() failed: %s\n", strerror(-ret));
1622                         return ret;
1623                 }
1624                 if (!strlist__has_entry(namelist, buf))
1625                         break;
1626         }
1627         if (i == MAX_EVENT_INDEX) {
1628                 pr_warning("Too many events are on the same function.\n");
1629                 ret = -ERANGE;
1630         }
1631
1632         return ret;
1633 }
1634
1635 static int __add_probe_trace_events(struct perf_probe_event *pev,
1636                                      struct probe_trace_event *tevs,
1637                                      int ntevs, bool allow_suffix)
1638 {
1639         int i, fd, ret;
1640         struct probe_trace_event *tev = NULL;
1641         char buf[64];
1642         const char *event, *group;
1643         struct strlist *namelist;
1644
1645         fd = open_kprobe_events(true);
1646         if (fd < 0)
1647                 return fd;
1648         /* Get current event names */
1649         namelist = get_probe_trace_event_names(fd, false);
1650         if (!namelist) {
1651                 pr_debug("Failed to get current event list.\n");
1652                 return -EIO;
1653         }
1654
1655         ret = 0;
1656         printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
1657         for (i = 0; i < ntevs; i++) {
1658                 tev = &tevs[i];
1659                 if (pev->event)
1660                         event = pev->event;
1661                 else
1662                         if (pev->point.function)
1663                                 event = pev->point.function;
1664                         else
1665                                 event = tev->point.symbol;
1666                 if (pev->group)
1667                         group = pev->group;
1668                 else
1669                         group = PERFPROBE_GROUP;
1670
1671                 /* Get an unused new event name */
1672                 ret = get_new_event_name(buf, 64, event,
1673                                          namelist, allow_suffix);
1674                 if (ret < 0)
1675                         break;
1676                 event = buf;
1677
1678                 tev->event = strdup(event);
1679                 tev->group = strdup(group);
1680                 if (tev->event == NULL || tev->group == NULL) {
1681                         ret = -ENOMEM;
1682                         break;
1683                 }
1684                 ret = write_probe_trace_event(fd, tev);
1685                 if (ret < 0)
1686                         break;
1687                 /* Add added event name to namelist */
1688                 strlist__add(namelist, event);
1689
1690                 /* Trick here - save current event/group */
1691                 event = pev->event;
1692                 group = pev->group;
1693                 pev->event = tev->event;
1694                 pev->group = tev->group;
1695                 show_perf_probe_event(pev);
1696                 /* Trick here - restore current event/group */
1697                 pev->event = (char *)event;
1698                 pev->group = (char *)group;
1699
1700                 /*
1701                  * Probes after the first probe which comes from same
1702                  * user input are always allowed to add suffix, because
1703                  * there might be several addresses corresponding to
1704                  * one code line.
1705                  */
1706                 allow_suffix = true;
1707         }
1708
1709         if (ret >= 0) {
1710                 /* Show how to use the event. */
1711                 printf("\nYou can now use it on all perf tools, such as:\n\n");
1712                 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
1713                          tev->event);
1714         }
1715
1716         strlist__delete(namelist);
1717         close(fd);
1718         return ret;
1719 }
1720
1721 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
1722                                           struct probe_trace_event **tevs,
1723                                           int max_tevs, const char *module)
1724 {
1725         struct symbol *sym;
1726         int ret = 0, i;
1727         struct probe_trace_event *tev;
1728
1729         /* Convert perf_probe_event with debuginfo */
1730         ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module);
1731         if (ret != 0)
1732                 return ret;
1733
1734         /* Allocate trace event buffer */
1735         tev = *tevs = zalloc(sizeof(struct probe_trace_event));
1736         if (tev == NULL)
1737                 return -ENOMEM;
1738
1739         /* Copy parameters */
1740         tev->point.symbol = strdup(pev->point.function);
1741         if (tev->point.symbol == NULL) {
1742                 ret = -ENOMEM;
1743                 goto error;
1744         }
1745         tev->point.offset = pev->point.offset;
1746         tev->point.retprobe = pev->point.retprobe;
1747         tev->nargs = pev->nargs;
1748         if (tev->nargs) {
1749                 tev->args = zalloc(sizeof(struct probe_trace_arg)
1750                                    * tev->nargs);
1751                 if (tev->args == NULL) {
1752                         ret = -ENOMEM;
1753                         goto error;
1754                 }
1755                 for (i = 0; i < tev->nargs; i++) {
1756                         if (pev->args[i].name) {
1757                                 tev->args[i].name = strdup(pev->args[i].name);
1758                                 if (tev->args[i].name == NULL) {
1759                                         ret = -ENOMEM;
1760                                         goto error;
1761                                 }
1762                         }
1763                         tev->args[i].value = strdup(pev->args[i].var);
1764                         if (tev->args[i].value == NULL) {
1765                                 ret = -ENOMEM;
1766                                 goto error;
1767                         }
1768                         if (pev->args[i].type) {
1769                                 tev->args[i].type = strdup(pev->args[i].type);
1770                                 if (tev->args[i].type == NULL) {
1771                                         ret = -ENOMEM;
1772                                         goto error;
1773                                 }
1774                         }
1775                 }
1776         }
1777
1778         /* Currently just checking function name from symbol map */
1779         sym = __find_kernel_function_by_name(tev->point.symbol, NULL);
1780         if (!sym) {
1781                 pr_warning("Kernel symbol \'%s\' not found.\n",
1782                            tev->point.symbol);
1783                 ret = -ENOENT;
1784                 goto error;
1785         }
1786
1787         return 1;
1788 error:
1789         clear_probe_trace_event(tev);
1790         free(tev);
1791         *tevs = NULL;
1792         return ret;
1793 }
1794
1795 struct __event_package {
1796         struct perf_probe_event         *pev;
1797         struct probe_trace_event        *tevs;
1798         int                             ntevs;
1799 };
1800
1801 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
1802                           int max_tevs, const char *module, bool force_add)
1803 {
1804         int i, j, ret;
1805         struct __event_package *pkgs;
1806
1807         pkgs = zalloc(sizeof(struct __event_package) * npevs);
1808         if (pkgs == NULL)
1809                 return -ENOMEM;
1810
1811         /* Init vmlinux path */
1812         ret = init_vmlinux();
1813         if (ret < 0) {
1814                 free(pkgs);
1815                 return ret;
1816         }
1817
1818         /* Loop 1: convert all events */
1819         for (i = 0; i < npevs; i++) {
1820                 pkgs[i].pev = &pevs[i];
1821                 /* Convert with or without debuginfo */
1822                 ret  = convert_to_probe_trace_events(pkgs[i].pev,
1823                                                      &pkgs[i].tevs,
1824                                                      max_tevs,
1825                                                      module);
1826                 if (ret < 0)
1827                         goto end;
1828                 pkgs[i].ntevs = ret;
1829         }
1830
1831         /* Loop 2: add all events */
1832         for (i = 0; i < npevs; i++) {
1833                 ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
1834                                                 pkgs[i].ntevs, force_add);
1835                 if (ret < 0)
1836                         break;
1837         }
1838 end:
1839         /* Loop 3: cleanup and free trace events  */
1840         for (i = 0; i < npevs; i++) {
1841                 for (j = 0; j < pkgs[i].ntevs; j++)
1842                         clear_probe_trace_event(&pkgs[i].tevs[j]);
1843                 free(pkgs[i].tevs);
1844         }
1845         free(pkgs);
1846
1847         return ret;
1848 }
1849
1850 static int __del_trace_probe_event(int fd, struct str_node *ent)
1851 {
1852         char *p;
1853         char buf[128];
1854         int ret;
1855
1856         /* Convert from perf-probe event to trace-probe event */
1857         ret = e_snprintf(buf, 128, "-:%s", ent->s);
1858         if (ret < 0)
1859                 goto error;
1860
1861         p = strchr(buf + 2, ':');
1862         if (!p) {
1863                 pr_debug("Internal error: %s should have ':' but not.\n",
1864                          ent->s);
1865                 ret = -ENOTSUP;
1866                 goto error;
1867         }
1868         *p = '/';
1869
1870         pr_debug("Writing event: %s\n", buf);
1871         ret = write(fd, buf, strlen(buf));
1872         if (ret < 0)
1873                 goto error;
1874
1875         printf("Remove event: %s\n", ent->s);
1876         return 0;
1877 error:
1878         pr_warning("Failed to delete event: %s\n", strerror(-ret));
1879         return ret;
1880 }
1881
1882 static int del_trace_probe_event(int fd, const char *group,
1883                                   const char *event, struct strlist *namelist)
1884 {
1885         char buf[128];
1886         struct str_node *ent, *n;
1887         int found = 0, ret = 0;
1888
1889         ret = e_snprintf(buf, 128, "%s:%s", group, event);
1890         if (ret < 0) {
1891                 pr_err("Failed to copy event.\n");
1892                 return ret;
1893         }
1894
1895         if (strpbrk(buf, "*?")) { /* Glob-exp */
1896                 strlist__for_each_safe(ent, n, namelist)
1897                         if (strglobmatch(ent->s, buf)) {
1898                                 found++;
1899                                 ret = __del_trace_probe_event(fd, ent);
1900                                 if (ret < 0)
1901                                         break;
1902                                 strlist__remove(namelist, ent);
1903                         }
1904         } else {
1905                 ent = strlist__find(namelist, buf);
1906                 if (ent) {
1907                         found++;
1908                         ret = __del_trace_probe_event(fd, ent);
1909                         if (ret >= 0)
1910                                 strlist__remove(namelist, ent);
1911                 }
1912         }
1913         if (found == 0 && ret >= 0)
1914                 pr_info("Info: Event \"%s\" does not exist.\n", buf);
1915
1916         return ret;
1917 }
1918
1919 int del_perf_probe_events(struct strlist *dellist)
1920 {
1921         int fd, ret = 0;
1922         const char *group, *event;
1923         char *p, *str;
1924         struct str_node *ent;
1925         struct strlist *namelist;
1926
1927         fd = open_kprobe_events(true);
1928         if (fd < 0)
1929                 return fd;
1930
1931         /* Get current event names */
1932         namelist = get_probe_trace_event_names(fd, true);
1933         if (namelist == NULL)
1934                 return -EINVAL;
1935
1936         strlist__for_each(ent, dellist) {
1937                 str = strdup(ent->s);
1938                 if (str == NULL) {
1939                         ret = -ENOMEM;
1940                         break;
1941                 }
1942                 pr_debug("Parsing: %s\n", str);
1943                 p = strchr(str, ':');
1944                 if (p) {
1945                         group = str;
1946                         *p = '\0';
1947                         event = p + 1;
1948                 } else {
1949                         group = "*";
1950                         event = str;
1951                 }
1952                 pr_debug("Group: %s, Event: %s\n", group, event);
1953                 ret = del_trace_probe_event(fd, group, event, namelist);
1954                 free(str);
1955                 if (ret < 0)
1956                         break;
1957         }
1958         strlist__delete(namelist);
1959         close(fd);
1960
1961         return ret;
1962 }
1963 /* TODO: don't use a global variable for filter ... */
1964 static struct strfilter *available_func_filter;
1965
1966 /*
1967  * If a symbol corresponds to a function with global binding and
1968  * matches filter return 0. For all others return 1.
1969  */
1970 static int filter_available_functions(struct map *map __unused,
1971                                       struct symbol *sym)
1972 {
1973         if (sym->binding == STB_GLOBAL &&
1974             strfilter__compare(available_func_filter, sym->name))
1975                 return 0;
1976         return 1;
1977 }
1978
1979 int show_available_funcs(const char *module, struct strfilter *_filter)
1980 {
1981         struct map *map;
1982         int ret;
1983
1984         setup_pager();
1985
1986         ret = init_vmlinux();
1987         if (ret < 0)
1988                 return ret;
1989
1990         map = kernel_get_module_map(module);
1991         if (!map) {
1992                 pr_err("Failed to find %s map.\n", (module) ? : "kernel");
1993                 return -EINVAL;
1994         }
1995         available_func_filter = _filter;
1996         if (map__load(map, filter_available_functions)) {
1997                 pr_err("Failed to load map.\n");
1998                 return -EINVAL;
1999         }
2000         if (!dso__sorted_by_name(map->dso, map->type))
2001                 dso__sort_by_name(map->dso, map->type);
2002
2003         dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
2004         return 0;
2005 }