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Linux/tools/perf/util/probe-event.c

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  1 /*
  2  * probe-event.c : perf-probe definition to probe_events format converter
  3  *
  4  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 19  *
 20  */
 21 
 22 #include <sys/utsname.h>
 23 #include <sys/types.h>
 24 #include <sys/stat.h>
 25 #include <fcntl.h>
 26 #include <errno.h>
 27 #include <stdio.h>
 28 #include <unistd.h>
 29 #include <stdlib.h>
 30 #include <string.h>
 31 #include <stdarg.h>
 32 #include <limits.h>
 33 #include <elf.h>
 34 
 35 #include "util.h"
 36 #include "event.h"
 37 #include "strlist.h"
 38 #include "debug.h"
 39 #include "cache.h"
 40 #include "color.h"
 41 #include "symbol.h"
 42 #include "thread.h"
 43 #include <api/fs/debugfs.h>
 44 #include "trace-event.h"        /* For __maybe_unused */
 45 #include "probe-event.h"
 46 #include "probe-finder.h"
 47 #include "session.h"
 48 
 49 #define MAX_CMDLEN 256
 50 #define PERFPROBE_GROUP "probe"
 51 
 52 bool probe_event_dry_run;       /* Dry run flag */
 53 
 54 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
 55 
 56 /* If there is no space to write, returns -E2BIG. */
 57 static int e_snprintf(char *str, size_t size, const char *format, ...)
 58         __attribute__((format(printf, 3, 4)));
 59 
 60 static int e_snprintf(char *str, size_t size, const char *format, ...)
 61 {
 62         int ret;
 63         va_list ap;
 64         va_start(ap, format);
 65         ret = vsnprintf(str, size, format, ap);
 66         va_end(ap);
 67         if (ret >= (int)size)
 68                 ret = -E2BIG;
 69         return ret;
 70 }
 71 
 72 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
 73 static int convert_name_to_addr(struct perf_probe_event *pev,
 74                                 const char *exec);
 75 static void clear_probe_trace_event(struct probe_trace_event *tev);
 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         /* A file path -- this is an offline module */
121         if (module && strchr(module, '/'))
122                 return machine__new_module(&machine, 0, module);
123 
124         if (!module)
125                 module = "kernel";
126 
127         for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
128                 struct map *pos = rb_entry(nd, struct map, rb_node);
129                 if (strncmp(pos->dso->short_name + 1, module,
130                             pos->dso->short_name_len - 2) == 0) {
131                         return pos;
132                 }
133         }
134         return NULL;
135 }
136 
137 static struct dso *kernel_get_module_dso(const char *module)
138 {
139         struct dso *dso;
140         struct map *map;
141         const char *vmlinux_name;
142 
143         if (module) {
144                 list_for_each_entry(dso, &machine.kernel_dsos, node) {
145                         if (strncmp(dso->short_name + 1, module,
146                                     dso->short_name_len - 2) == 0)
147                                 goto found;
148                 }
149                 pr_debug("Failed to find module %s.\n", module);
150                 return NULL;
151         }
152 
153         map = machine.vmlinux_maps[MAP__FUNCTION];
154         dso = map->dso;
155 
156         vmlinux_name = symbol_conf.vmlinux_name;
157         if (vmlinux_name) {
158                 if (dso__load_vmlinux(dso, map, vmlinux_name, false, NULL) <= 0)
159                         return NULL;
160         } else {
161                 if (dso__load_vmlinux_path(dso, map, NULL) <= 0) {
162                         pr_debug("Failed to load kernel map.\n");
163                         return NULL;
164                 }
165         }
166 found:
167         return dso;
168 }
169 
170 const char *kernel_get_module_path(const char *module)
171 {
172         struct dso *dso = kernel_get_module_dso(module);
173         return (dso) ? dso->long_name : NULL;
174 }
175 
176 static int init_user_exec(void)
177 {
178         int ret = 0;
179 
180         symbol_conf.try_vmlinux_path = false;
181         symbol_conf.sort_by_name = true;
182         ret = symbol__init();
183 
184         if (ret < 0)
185                 pr_debug("Failed to init symbol map.\n");
186 
187         return ret;
188 }
189 
190 static int convert_exec_to_group(const char *exec, char **result)
191 {
192         char *ptr1, *ptr2, *exec_copy;
193         char buf[64];
194         int ret;
195 
196         exec_copy = strdup(exec);
197         if (!exec_copy)
198                 return -ENOMEM;
199 
200         ptr1 = basename(exec_copy);
201         if (!ptr1) {
202                 ret = -EINVAL;
203                 goto out;
204         }
205 
206         ptr2 = strpbrk(ptr1, "-._");
207         if (ptr2)
208                 *ptr2 = '\0';
209         ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
210         if (ret < 0)
211                 goto out;
212 
213         *result = strdup(buf);
214         ret = *result ? 0 : -ENOMEM;
215 
216 out:
217         free(exec_copy);
218         return ret;
219 }
220 
221 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
222                                         struct perf_probe_point *pp)
223 {
224         pp->function = strdup(tp->symbol);
225 
226         if (pp->function == NULL)
227                 return -ENOMEM;
228 
229         pp->offset = tp->offset;
230         pp->retprobe = tp->retprobe;
231 
232         return 0;
233 }
234 
235 #ifdef HAVE_DWARF_SUPPORT
236 /* Open new debuginfo of given module */
237 static struct debuginfo *open_debuginfo(const char *module)
238 {
239         const char *path;
240 
241         /* A file path -- this is an offline module */
242         if (module && strchr(module, '/'))
243                 path = module;
244         else {
245                 path = kernel_get_module_path(module);
246 
247                 if (!path) {
248                         pr_err("Failed to find path of %s module.\n",
249                                module ?: "kernel");
250                         return NULL;
251                 }
252         }
253         return debuginfo__new(path);
254 }
255 
256 /*
257  * Convert trace point to probe point with debuginfo
258  * Currently only handles kprobes.
259  */
260 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
261                                         struct perf_probe_point *pp)
262 {
263         struct symbol *sym;
264         struct map *map;
265         u64 addr;
266         int ret = -ENOENT;
267         struct debuginfo *dinfo;
268 
269         sym = __find_kernel_function_by_name(tp->symbol, &map);
270         if (sym) {
271                 addr = map->unmap_ip(map, sym->start + tp->offset);
272                 pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol,
273                          tp->offset, addr);
274 
275                 dinfo = debuginfo__new_online_kernel(addr);
276                 if (dinfo) {
277                         ret = debuginfo__find_probe_point(dinfo,
278                                                  (unsigned long)addr, pp);
279                         debuginfo__delete(dinfo);
280                 } else {
281                         pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n",
282                                  addr);
283                         ret = -ENOENT;
284                 }
285         }
286         if (ret <= 0) {
287                 pr_debug("Failed to find corresponding probes from "
288                          "debuginfo. Use kprobe event information.\n");
289                 return convert_to_perf_probe_point(tp, pp);
290         }
291         pp->retprobe = tp->retprobe;
292 
293         return 0;
294 }
295 
296 static int get_text_start_address(const char *exec, unsigned long *address)
297 {
298         Elf *elf;
299         GElf_Ehdr ehdr;
300         GElf_Shdr shdr;
301         int fd, ret = -ENOENT;
302 
303         fd = open(exec, O_RDONLY);
304         if (fd < 0)
305                 return -errno;
306 
307         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
308         if (elf == NULL)
309                 return -EINVAL;
310 
311         if (gelf_getehdr(elf, &ehdr) == NULL)
312                 goto out;
313 
314         if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
315                 goto out;
316 
317         *address = shdr.sh_addr - shdr.sh_offset;
318         ret = 0;
319 out:
320         elf_end(elf);
321         return ret;
322 }
323 
324 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
325                                           int ntevs, const char *exec)
326 {
327         int i, ret = 0;
328         unsigned long offset, stext = 0;
329         char buf[32];
330 
331         if (!exec)
332                 return 0;
333 
334         ret = get_text_start_address(exec, &stext);
335         if (ret < 0)
336                 return ret;
337 
338         for (i = 0; i < ntevs && ret >= 0; i++) {
339                 /* point.address is the addres of point.symbol + point.offset */
340                 offset = tevs[i].point.address - stext;
341                 tevs[i].point.offset = 0;
342                 zfree(&tevs[i].point.symbol);
343                 ret = e_snprintf(buf, 32, "0x%lx", offset);
344                 if (ret < 0)
345                         break;
346                 tevs[i].point.module = strdup(exec);
347                 tevs[i].point.symbol = strdup(buf);
348                 if (!tevs[i].point.symbol || !tevs[i].point.module) {
349                         ret = -ENOMEM;
350                         break;
351                 }
352                 tevs[i].uprobes = true;
353         }
354 
355         return ret;
356 }
357 
358 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
359                                             int ntevs, const char *module)
360 {
361         int i, ret = 0;
362         char *tmp;
363 
364         if (!module)
365                 return 0;
366 
367         tmp = strrchr(module, '/');
368         if (tmp) {
369                 /* This is a module path -- get the module name */
370                 module = strdup(tmp + 1);
371                 if (!module)
372                         return -ENOMEM;
373                 tmp = strchr(module, '.');
374                 if (tmp)
375                         *tmp = '\0';
376                 tmp = (char *)module;   /* For free() */
377         }
378 
379         for (i = 0; i < ntevs; i++) {
380                 tevs[i].point.module = strdup(module);
381                 if (!tevs[i].point.module) {
382                         ret = -ENOMEM;
383                         break;
384                 }
385         }
386 
387         free(tmp);
388         return ret;
389 }
390 
391 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
392 {
393         int i;
394 
395         for (i = 0; i < ntevs; i++)
396                 clear_probe_trace_event(tevs + i);
397 }
398 
399 /* Try to find perf_probe_event with debuginfo */
400 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
401                                           struct probe_trace_event **tevs,
402                                           int max_tevs, const char *target)
403 {
404         bool need_dwarf = perf_probe_event_need_dwarf(pev);
405         struct debuginfo *dinfo;
406         int ntevs, ret = 0;
407 
408         dinfo = open_debuginfo(target);
409 
410         if (!dinfo) {
411                 if (need_dwarf) {
412                         pr_warning("Failed to open debuginfo file.\n");
413                         return -ENOENT;
414                 }
415                 pr_debug("Could not open debuginfo. Try to use symbols.\n");
416                 return 0;
417         }
418 
419         /* Searching trace events corresponding to a probe event */
420         ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
421 
422         debuginfo__delete(dinfo);
423 
424         if (ntevs > 0) {        /* Succeeded to find trace events */
425                 pr_debug("find %d probe_trace_events.\n", ntevs);
426                 if (target) {
427                         if (pev->uprobes)
428                                 ret = add_exec_to_probe_trace_events(*tevs,
429                                                  ntevs, target);
430                         else
431                                 ret = add_module_to_probe_trace_events(*tevs,
432                                                  ntevs, target);
433                 }
434                 if (ret < 0) {
435                         clear_probe_trace_events(*tevs, ntevs);
436                         zfree(tevs);
437                 }
438                 return ret < 0 ? ret : ntevs;
439         }
440 
441         if (ntevs == 0) {       /* No error but failed to find probe point. */
442                 pr_warning("Probe point '%s' not found.\n",
443                            synthesize_perf_probe_point(&pev->point));
444                 return -ENOENT;
445         }
446         /* Error path : ntevs < 0 */
447         pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
448         if (ntevs == -EBADF) {
449                 pr_warning("Warning: No dwarf info found in the vmlinux - "
450                         "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
451                 if (!need_dwarf) {
452                         pr_debug("Trying to use symbols.\n");
453                         return 0;
454                 }
455         }
456         return ntevs;
457 }
458 
459 /*
460  * Find a src file from a DWARF tag path. Prepend optional source path prefix
461  * and chop off leading directories that do not exist. Result is passed back as
462  * a newly allocated path on success.
463  * Return 0 if file was found and readable, -errno otherwise.
464  */
465 static int get_real_path(const char *raw_path, const char *comp_dir,
466                          char **new_path)
467 {
468         const char *prefix = symbol_conf.source_prefix;
469 
470         if (!prefix) {
471                 if (raw_path[0] != '/' && comp_dir)
472                         /* If not an absolute path, try to use comp_dir */
473                         prefix = comp_dir;
474                 else {
475                         if (access(raw_path, R_OK) == 0) {
476                                 *new_path = strdup(raw_path);
477                                 return 0;
478                         } else
479                                 return -errno;
480                 }
481         }
482 
483         *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
484         if (!*new_path)
485                 return -ENOMEM;
486 
487         for (;;) {
488                 sprintf(*new_path, "%s/%s", prefix, raw_path);
489 
490                 if (access(*new_path, R_OK) == 0)
491                         return 0;
492 
493                 if (!symbol_conf.source_prefix)
494                         /* In case of searching comp_dir, don't retry */
495                         return -errno;
496 
497                 switch (errno) {
498                 case ENAMETOOLONG:
499                 case ENOENT:
500                 case EROFS:
501                 case EFAULT:
502                         raw_path = strchr(++raw_path, '/');
503                         if (!raw_path) {
504                                 zfree(new_path);
505                                 return -ENOENT;
506                         }
507                         continue;
508 
509                 default:
510                         zfree(new_path);
511                         return -errno;
512                 }
513         }
514 }
515 
516 #define LINEBUF_SIZE 256
517 #define NR_ADDITIONAL_LINES 2
518 
519 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
520 {
521         char buf[LINEBUF_SIZE];
522         const char *color = show_num ? "" : PERF_COLOR_BLUE;
523         const char *prefix = NULL;
524 
525         do {
526                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
527                         goto error;
528                 if (skip)
529                         continue;
530                 if (!prefix) {
531                         prefix = show_num ? "%7d  " : "         ";
532                         color_fprintf(stdout, color, prefix, l);
533                 }
534                 color_fprintf(stdout, color, "%s", buf);
535 
536         } while (strchr(buf, '\n') == NULL);
537 
538         return 1;
539 error:
540         if (ferror(fp)) {
541                 pr_warning("File read error: %s\n", strerror(errno));
542                 return -1;
543         }
544         return 0;
545 }
546 
547 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
548 {
549         int rv = __show_one_line(fp, l, skip, show_num);
550         if (rv == 0) {
551                 pr_warning("Source file is shorter than expected.\n");
552                 rv = -1;
553         }
554         return rv;
555 }
556 
557 #define show_one_line_with_num(f,l)     _show_one_line(f,l,false,true)
558 #define show_one_line(f,l)              _show_one_line(f,l,false,false)
559 #define skip_one_line(f,l)              _show_one_line(f,l,true,false)
560 #define show_one_line_or_eof(f,l)       __show_one_line(f,l,false,false)
561 
562 /*
563  * Show line-range always requires debuginfo to find source file and
564  * line number.
565  */
566 int show_line_range(struct line_range *lr, const char *module)
567 {
568         int l = 1;
569         struct line_node *ln;
570         struct debuginfo *dinfo;
571         FILE *fp;
572         int ret;
573         char *tmp;
574 
575         /* Search a line range */
576         ret = init_vmlinux();
577         if (ret < 0)
578                 return ret;
579 
580         dinfo = open_debuginfo(module);
581         if (!dinfo) {
582                 pr_warning("Failed to open debuginfo file.\n");
583                 return -ENOENT;
584         }
585 
586         ret = debuginfo__find_line_range(dinfo, lr);
587         debuginfo__delete(dinfo);
588         if (ret == 0) {
589                 pr_warning("Specified source line is not found.\n");
590                 return -ENOENT;
591         } else if (ret < 0) {
592                 pr_warning("Debuginfo analysis failed. (%d)\n", ret);
593                 return ret;
594         }
595 
596         /* Convert source file path */
597         tmp = lr->path;
598         ret = get_real_path(tmp, lr->comp_dir, &lr->path);
599         free(tmp);      /* Free old path */
600         if (ret < 0) {
601                 pr_warning("Failed to find source file. (%d)\n", ret);
602                 return ret;
603         }
604 
605         setup_pager();
606 
607         if (lr->function)
608                 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
609                         lr->start - lr->offset);
610         else
611                 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
612 
613         fp = fopen(lr->path, "r");
614         if (fp == NULL) {
615                 pr_warning("Failed to open %s: %s\n", lr->path,
616                            strerror(errno));
617                 return -errno;
618         }
619         /* Skip to starting line number */
620         while (l < lr->start) {
621                 ret = skip_one_line(fp, l++);
622                 if (ret < 0)
623                         goto end;
624         }
625 
626         list_for_each_entry(ln, &lr->line_list, list) {
627                 for (; ln->line > l; l++) {
628                         ret = show_one_line(fp, l - lr->offset);
629                         if (ret < 0)
630                                 goto end;
631                 }
632                 ret = show_one_line_with_num(fp, l++ - lr->offset);
633                 if (ret < 0)
634                         goto end;
635         }
636 
637         if (lr->end == INT_MAX)
638                 lr->end = l + NR_ADDITIONAL_LINES;
639         while (l <= lr->end) {
640                 ret = show_one_line_or_eof(fp, l++ - lr->offset);
641                 if (ret <= 0)
642                         break;
643         }
644 end:
645         fclose(fp);
646         return ret;
647 }
648 
649 static int show_available_vars_at(struct debuginfo *dinfo,
650                                   struct perf_probe_event *pev,
651                                   int max_vls, struct strfilter *_filter,
652                                   bool externs)
653 {
654         char *buf;
655         int ret, i, nvars;
656         struct str_node *node;
657         struct variable_list *vls = NULL, *vl;
658         const char *var;
659 
660         buf = synthesize_perf_probe_point(&pev->point);
661         if (!buf)
662                 return -EINVAL;
663         pr_debug("Searching variables at %s\n", buf);
664 
665         ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
666                                                 max_vls, externs);
667         if (ret <= 0) {
668                 pr_err("Failed to find variables at %s (%d)\n", buf, ret);
669                 goto end;
670         }
671         /* Some variables are found */
672         fprintf(stdout, "Available variables at %s\n", buf);
673         for (i = 0; i < ret; i++) {
674                 vl = &vls[i];
675                 /*
676                  * A probe point might be converted to
677                  * several trace points.
678                  */
679                 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
680                         vl->point.offset);
681                 zfree(&vl->point.symbol);
682                 nvars = 0;
683                 if (vl->vars) {
684                         strlist__for_each(node, vl->vars) {
685                                 var = strchr(node->s, '\t') + 1;
686                                 if (strfilter__compare(_filter, var)) {
687                                         fprintf(stdout, "\t\t%s\n", node->s);
688                                         nvars++;
689                                 }
690                         }
691                         strlist__delete(vl->vars);
692                 }
693                 if (nvars == 0)
694                         fprintf(stdout, "\t\t(No matched variables)\n");
695         }
696         free(vls);
697 end:
698         free(buf);
699         return ret;
700 }
701 
702 /* Show available variables on given probe point */
703 int show_available_vars(struct perf_probe_event *pevs, int npevs,
704                         int max_vls, const char *module,
705                         struct strfilter *_filter, bool externs)
706 {
707         int i, ret = 0;
708         struct debuginfo *dinfo;
709 
710         ret = init_vmlinux();
711         if (ret < 0)
712                 return ret;
713 
714         dinfo = open_debuginfo(module);
715         if (!dinfo) {
716                 pr_warning("Failed to open debuginfo file.\n");
717                 return -ENOENT;
718         }
719 
720         setup_pager();
721 
722         for (i = 0; i < npevs && ret >= 0; i++)
723                 ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
724                                              externs);
725 
726         debuginfo__delete(dinfo);
727         return ret;
728 }
729 
730 #else   /* !HAVE_DWARF_SUPPORT */
731 
732 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
733                                         struct perf_probe_point *pp)
734 {
735         struct symbol *sym;
736 
737         sym = __find_kernel_function_by_name(tp->symbol, NULL);
738         if (!sym) {
739                 pr_err("Failed to find symbol %s in kernel.\n", tp->symbol);
740                 return -ENOENT;
741         }
742 
743         return convert_to_perf_probe_point(tp, pp);
744 }
745 
746 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
747                                 struct probe_trace_event **tevs __maybe_unused,
748                                 int max_tevs __maybe_unused,
749                                 const char *target __maybe_unused)
750 {
751         if (perf_probe_event_need_dwarf(pev)) {
752                 pr_warning("Debuginfo-analysis is not supported.\n");
753                 return -ENOSYS;
754         }
755 
756         return 0;
757 }
758 
759 int show_line_range(struct line_range *lr __maybe_unused,
760                     const char *module __maybe_unused)
761 {
762         pr_warning("Debuginfo-analysis is not supported.\n");
763         return -ENOSYS;
764 }
765 
766 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
767                         int npevs __maybe_unused, int max_vls __maybe_unused,
768                         const char *module __maybe_unused,
769                         struct strfilter *filter __maybe_unused,
770                         bool externs __maybe_unused)
771 {
772         pr_warning("Debuginfo-analysis is not supported.\n");
773         return -ENOSYS;
774 }
775 #endif
776 
777 void line_range__clear(struct line_range *lr)
778 {
779         struct line_node *ln;
780 
781         free(lr->function);
782         free(lr->file);
783         free(lr->path);
784         free(lr->comp_dir);
785         while (!list_empty(&lr->line_list)) {
786                 ln = list_first_entry(&lr->line_list, struct line_node, list);
787                 list_del(&ln->list);
788                 free(ln);
789         }
790         memset(lr, 0, sizeof(*lr));
791 }
792 
793 void line_range__init(struct line_range *lr)
794 {
795         memset(lr, 0, sizeof(*lr));
796         INIT_LIST_HEAD(&lr->line_list);
797 }
798 
799 static int parse_line_num(char **ptr, int *val, const char *what)
800 {
801         const char *start = *ptr;
802 
803         errno = 0;
804         *val = strtol(*ptr, ptr, 0);
805         if (errno || *ptr == start) {
806                 semantic_error("'%s' is not a valid number.\n", what);
807                 return -EINVAL;
808         }
809         return 0;
810 }
811 
812 /*
813  * Stuff 'lr' according to the line range described by 'arg'.
814  * The line range syntax is described by:
815  *
816  *         SRC[:SLN[+NUM|-ELN]]
817  *         FNC[@SRC][:SLN[+NUM|-ELN]]
818  */
819 int parse_line_range_desc(const char *arg, struct line_range *lr)
820 {
821         char *range, *file, *name = strdup(arg);
822         int err;
823 
824         if (!name)
825                 return -ENOMEM;
826 
827         lr->start = 0;
828         lr->end = INT_MAX;
829 
830         range = strchr(name, ':');
831         if (range) {
832                 *range++ = '\0';
833 
834                 err = parse_line_num(&range, &lr->start, "start line");
835                 if (err)
836                         goto err;
837 
838                 if (*range == '+' || *range == '-') {
839                         const char c = *range++;
840 
841                         err = parse_line_num(&range, &lr->end, "end line");
842                         if (err)
843                                 goto err;
844 
845                         if (c == '+') {
846                                 lr->end += lr->start;
847                                 /*
848                                  * Adjust the number of lines here.
849                                  * If the number of lines == 1, the
850                                  * the end of line should be equal to
851                                  * the start of line.
852                                  */
853                                 lr->end--;
854                         }
855                 }
856 
857                 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
858 
859                 err = -EINVAL;
860                 if (lr->start > lr->end) {
861                         semantic_error("Start line must be smaller"
862                                        " than end line.\n");
863                         goto err;
864                 }
865                 if (*range != '\0') {
866                         semantic_error("Tailing with invalid str '%s'.\n", range);
867                         goto err;
868                 }
869         }
870 
871         file = strchr(name, '@');
872         if (file) {
873                 *file = '\0';
874                 lr->file = strdup(++file);
875                 if (lr->file == NULL) {
876                         err = -ENOMEM;
877                         goto err;
878                 }
879                 lr->function = name;
880         } else if (strchr(name, '.'))
881                 lr->file = name;
882         else
883                 lr->function = name;
884 
885         return 0;
886 err:
887         free(name);
888         return err;
889 }
890 
891 /* Check the name is good for event/group */
892 static bool check_event_name(const char *name)
893 {
894         if (!isalpha(*name) && *name != '_')
895                 return false;
896         while (*++name != '\0') {
897                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
898                         return false;
899         }
900         return true;
901 }
902 
903 /* Parse probepoint definition. */
904 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
905 {
906         struct perf_probe_point *pp = &pev->point;
907         char *ptr, *tmp;
908         char c, nc = 0;
909         /*
910          * <Syntax>
911          * perf probe [EVENT=]SRC[:LN|;PTN]
912          * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
913          *
914          * TODO:Group name support
915          */
916 
917         ptr = strpbrk(arg, ";=@+%");
918         if (ptr && *ptr == '=') {       /* Event name */
919                 *ptr = '\0';
920                 tmp = ptr + 1;
921                 if (strchr(arg, ':')) {
922                         semantic_error("Group name is not supported yet.\n");
923                         return -ENOTSUP;
924                 }
925                 if (!check_event_name(arg)) {
926                         semantic_error("%s is bad for event name -it must "
927                                        "follow C symbol-naming rule.\n", arg);
928                         return -EINVAL;
929                 }
930                 pev->event = strdup(arg);
931                 if (pev->event == NULL)
932                         return -ENOMEM;
933                 pev->group = NULL;
934                 arg = tmp;
935         }
936 
937         ptr = strpbrk(arg, ";:+@%");
938         if (ptr) {
939                 nc = *ptr;
940                 *ptr++ = '\0';
941         }
942 
943         tmp = strdup(arg);
944         if (tmp == NULL)
945                 return -ENOMEM;
946 
947         /* Check arg is function or file and copy it */
948         if (strchr(tmp, '.'))   /* File */
949                 pp->file = tmp;
950         else                    /* Function */
951                 pp->function = tmp;
952 
953         /* Parse other options */
954         while (ptr) {
955                 arg = ptr;
956                 c = nc;
957                 if (c == ';') { /* Lazy pattern must be the last part */
958                         pp->lazy_line = strdup(arg);
959                         if (pp->lazy_line == NULL)
960                                 return -ENOMEM;
961                         break;
962                 }
963                 ptr = strpbrk(arg, ";:+@%");
964                 if (ptr) {
965                         nc = *ptr;
966                         *ptr++ = '\0';
967                 }
968                 switch (c) {
969                 case ':':       /* Line number */
970                         pp->line = strtoul(arg, &tmp, 0);
971                         if (*tmp != '\0') {
972                                 semantic_error("There is non-digit char"
973                                                " in line number.\n");
974                                 return -EINVAL;
975                         }
976                         break;
977                 case '+':       /* Byte offset from a symbol */
978                         pp->offset = strtoul(arg, &tmp, 0);
979                         if (*tmp != '\0') {
980                                 semantic_error("There is non-digit character"
981                                                 " in offset.\n");
982                                 return -EINVAL;
983                         }
984                         break;
985                 case '@':       /* File name */
986                         if (pp->file) {
987                                 semantic_error("SRC@SRC is not allowed.\n");
988                                 return -EINVAL;
989                         }
990                         pp->file = strdup(arg);
991                         if (pp->file == NULL)
992                                 return -ENOMEM;
993                         break;
994                 case '%':       /* Probe places */
995                         if (strcmp(arg, "return") == 0) {
996                                 pp->retprobe = 1;
997                         } else {        /* Others not supported yet */
998                                 semantic_error("%%%s is not supported.\n", arg);
999                                 return -ENOTSUP;
1000                         }
1001                         break;
1002                 default:        /* Buggy case */
1003                         pr_err("This program has a bug at %s:%d.\n",
1004                                 __FILE__, __LINE__);
1005                         return -ENOTSUP;
1006                         break;
1007                 }
1008         }
1009 
1010         /* Exclusion check */
1011         if (pp->lazy_line && pp->line) {
1012                 semantic_error("Lazy pattern can't be used with"
1013                                " line number.\n");
1014                 return -EINVAL;
1015         }
1016 
1017         if (pp->lazy_line && pp->offset) {
1018                 semantic_error("Lazy pattern can't be used with offset.\n");
1019                 return -EINVAL;
1020         }
1021 
1022         if (pp->line && pp->offset) {
1023                 semantic_error("Offset can't be used with line number.\n");
1024                 return -EINVAL;
1025         }
1026 
1027         if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1028                 semantic_error("File always requires line number or "
1029                                "lazy pattern.\n");
1030                 return -EINVAL;
1031         }
1032 
1033         if (pp->offset && !pp->function) {
1034                 semantic_error("Offset requires an entry function.\n");
1035                 return -EINVAL;
1036         }
1037 
1038         if (pp->retprobe && !pp->function) {
1039                 semantic_error("Return probe requires an entry function.\n");
1040                 return -EINVAL;
1041         }
1042 
1043         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1044                 semantic_error("Offset/Line/Lazy pattern can't be used with "
1045                                "return probe.\n");
1046                 return -EINVAL;
1047         }
1048 
1049         pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1050                  pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1051                  pp->lazy_line);
1052         return 0;
1053 }
1054 
1055 /* Parse perf-probe event argument */
1056 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1057 {
1058         char *tmp, *goodname;
1059         struct perf_probe_arg_field **fieldp;
1060 
1061         pr_debug("parsing arg: %s into ", str);
1062 
1063         tmp = strchr(str, '=');
1064         if (tmp) {
1065                 arg->name = strndup(str, tmp - str);
1066                 if (arg->name == NULL)
1067                         return -ENOMEM;
1068                 pr_debug("name:%s ", arg->name);
1069                 str = tmp + 1;
1070         }
1071 
1072         tmp = strchr(str, ':');
1073         if (tmp) {      /* Type setting */
1074                 *tmp = '\0';
1075                 arg->type = strdup(tmp + 1);
1076                 if (arg->type == NULL)
1077                         return -ENOMEM;
1078                 pr_debug("type:%s ", arg->type);
1079         }
1080 
1081         tmp = strpbrk(str, "-.[");
1082         if (!is_c_varname(str) || !tmp) {
1083                 /* A variable, register, symbol or special value */
1084                 arg->var = strdup(str);
1085                 if (arg->var == NULL)
1086                         return -ENOMEM;
1087                 pr_debug("%s\n", arg->var);
1088                 return 0;
1089         }
1090 
1091         /* Structure fields or array element */
1092         arg->var = strndup(str, tmp - str);
1093         if (arg->var == NULL)
1094                 return -ENOMEM;
1095         goodname = arg->var;
1096         pr_debug("%s, ", arg->var);
1097         fieldp = &arg->field;
1098 
1099         do {
1100                 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1101                 if (*fieldp == NULL)
1102                         return -ENOMEM;
1103                 if (*tmp == '[') {      /* Array */
1104                         str = tmp;
1105                         (*fieldp)->index = strtol(str + 1, &tmp, 0);
1106                         (*fieldp)->ref = true;
1107                         if (*tmp != ']' || tmp == str + 1) {
1108                                 semantic_error("Array index must be a"
1109                                                 " number.\n");
1110                                 return -EINVAL;
1111                         }
1112                         tmp++;
1113                         if (*tmp == '\0')
1114                                 tmp = NULL;
1115                 } else {                /* Structure */
1116                         if (*tmp == '.') {
1117                                 str = tmp + 1;
1118                                 (*fieldp)->ref = false;
1119                         } else if (tmp[1] == '>') {
1120                                 str = tmp + 2;
1121                                 (*fieldp)->ref = true;
1122                         } else {
1123                                 semantic_error("Argument parse error: %s\n",
1124                                                str);
1125                                 return -EINVAL;
1126                         }
1127                         tmp = strpbrk(str, "-.[");
1128                 }
1129                 if (tmp) {
1130                         (*fieldp)->name = strndup(str, tmp - str);
1131                         if ((*fieldp)->name == NULL)
1132                                 return -ENOMEM;
1133                         if (*str != '[')
1134                                 goodname = (*fieldp)->name;
1135                         pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1136                         fieldp = &(*fieldp)->next;
1137                 }
1138         } while (tmp);
1139         (*fieldp)->name = strdup(str);
1140         if ((*fieldp)->name == NULL)
1141                 return -ENOMEM;
1142         if (*str != '[')
1143                 goodname = (*fieldp)->name;
1144         pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1145 
1146         /* If no name is specified, set the last field name (not array index)*/
1147         if (!arg->name) {
1148                 arg->name = strdup(goodname);
1149                 if (arg->name == NULL)
1150                         return -ENOMEM;
1151         }
1152         return 0;
1153 }
1154 
1155 /* Parse perf-probe event command */
1156 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1157 {
1158         char **argv;
1159         int argc, i, ret = 0;
1160 
1161         argv = argv_split(cmd, &argc);
1162         if (!argv) {
1163                 pr_debug("Failed to split arguments.\n");
1164                 return -ENOMEM;
1165         }
1166         if (argc - 1 > MAX_PROBE_ARGS) {
1167                 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1168                 ret = -ERANGE;
1169                 goto out;
1170         }
1171         /* Parse probe point */
1172         ret = parse_perf_probe_point(argv[0], pev);
1173         if (ret < 0)
1174                 goto out;
1175 
1176         /* Copy arguments and ensure return probe has no C argument */
1177         pev->nargs = argc - 1;
1178         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1179         if (pev->args == NULL) {
1180                 ret = -ENOMEM;
1181                 goto out;
1182         }
1183         for (i = 0; i < pev->nargs && ret >= 0; i++) {
1184                 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1185                 if (ret >= 0 &&
1186                     is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1187                         semantic_error("You can't specify local variable for"
1188                                        " kretprobe.\n");
1189                         ret = -EINVAL;
1190                 }
1191         }
1192 out:
1193         argv_free(argv);
1194 
1195         return ret;
1196 }
1197 
1198 /* Return true if this perf_probe_event requires debuginfo */
1199 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1200 {
1201         int i;
1202 
1203         if (pev->point.file || pev->point.line || pev->point.lazy_line)
1204                 return true;
1205 
1206         for (i = 0; i < pev->nargs; i++)
1207                 if (is_c_varname(pev->args[i].var))
1208                         return true;
1209 
1210         return false;
1211 }
1212 
1213 /* Parse probe_events event into struct probe_point */
1214 static int parse_probe_trace_command(const char *cmd,
1215                                      struct probe_trace_event *tev)
1216 {
1217         struct probe_trace_point *tp = &tev->point;
1218         char pr;
1219         char *p;
1220         char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1221         int ret, i, argc;
1222         char **argv;
1223 
1224         pr_debug("Parsing probe_events: %s\n", cmd);
1225         argv = argv_split(cmd, &argc);
1226         if (!argv) {
1227                 pr_debug("Failed to split arguments.\n");
1228                 return -ENOMEM;
1229         }
1230         if (argc < 2) {
1231                 semantic_error("Too few probe arguments.\n");
1232                 ret = -ERANGE;
1233                 goto out;
1234         }
1235 
1236         /* Scan event and group name. */
1237         argv0_str = strdup(argv[0]);
1238         if (argv0_str == NULL) {
1239                 ret = -ENOMEM;
1240                 goto out;
1241         }
1242         fmt1_str = strtok_r(argv0_str, ":", &fmt);
1243         fmt2_str = strtok_r(NULL, "/", &fmt);
1244         fmt3_str = strtok_r(NULL, " \t", &fmt);
1245         if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1246             || fmt3_str == NULL) {
1247                 semantic_error("Failed to parse event name: %s\n", argv[0]);
1248                 ret = -EINVAL;
1249                 goto out;
1250         }
1251         pr = fmt1_str[0];
1252         tev->group = strdup(fmt2_str);
1253         tev->event = strdup(fmt3_str);
1254         if (tev->group == NULL || tev->event == NULL) {
1255                 ret = -ENOMEM;
1256                 goto out;
1257         }
1258         pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1259 
1260         tp->retprobe = (pr == 'r');
1261 
1262         /* Scan module name(if there), function name and offset */
1263         p = strchr(argv[1], ':');
1264         if (p) {
1265                 tp->module = strndup(argv[1], p - argv[1]);
1266                 p++;
1267         } else
1268                 p = argv[1];
1269         fmt1_str = strtok_r(p, "+", &fmt);
1270         tp->symbol = strdup(fmt1_str);
1271         if (tp->symbol == NULL) {
1272                 ret = -ENOMEM;
1273                 goto out;
1274         }
1275         fmt2_str = strtok_r(NULL, "", &fmt);
1276         if (fmt2_str == NULL)
1277                 tp->offset = 0;
1278         else
1279                 tp->offset = strtoul(fmt2_str, NULL, 10);
1280 
1281         tev->nargs = argc - 2;
1282         tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1283         if (tev->args == NULL) {
1284                 ret = -ENOMEM;
1285                 goto out;
1286         }
1287         for (i = 0; i < tev->nargs; i++) {
1288                 p = strchr(argv[i + 2], '=');
1289                 if (p)  /* We don't need which register is assigned. */
1290                         *p++ = '\0';
1291                 else
1292                         p = argv[i + 2];
1293                 tev->args[i].name = strdup(argv[i + 2]);
1294                 /* TODO: parse regs and offset */
1295                 tev->args[i].value = strdup(p);
1296                 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1297                         ret = -ENOMEM;
1298                         goto out;
1299                 }
1300         }
1301         ret = 0;
1302 out:
1303         free(argv0_str);
1304         argv_free(argv);
1305         return ret;
1306 }
1307 
1308 /* Compose only probe arg */
1309 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
1310 {
1311         struct perf_probe_arg_field *field = pa->field;
1312         int ret;
1313         char *tmp = buf;
1314 
1315         if (pa->name && pa->var)
1316                 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
1317         else
1318                 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
1319         if (ret <= 0)
1320                 goto error;
1321         tmp += ret;
1322         len -= ret;
1323 
1324         while (field) {
1325                 if (field->name[0] == '[')
1326                         ret = e_snprintf(tmp, len, "%s", field->name);
1327                 else
1328                         ret = e_snprintf(tmp, len, "%s%s",
1329                                          field->ref ? "->" : ".", field->name);
1330                 if (ret <= 0)
1331                         goto error;
1332                 tmp += ret;
1333                 len -= ret;
1334                 field = field->next;
1335         }
1336 
1337         if (pa->type) {
1338                 ret = e_snprintf(tmp, len, ":%s", pa->type);
1339                 if (ret <= 0)
1340                         goto error;
1341                 tmp += ret;
1342                 len -= ret;
1343         }
1344 
1345         return tmp - buf;
1346 error:
1347         pr_debug("Failed to synthesize perf probe argument: %s\n",
1348                  strerror(-ret));
1349         return ret;
1350 }
1351 
1352 /* Compose only probe point (not argument) */
1353 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1354 {
1355         char *buf, *tmp;
1356         char offs[32] = "", line[32] = "", file[32] = "";
1357         int ret, len;
1358 
1359         buf = zalloc(MAX_CMDLEN);
1360         if (buf == NULL) {
1361                 ret = -ENOMEM;
1362                 goto error;
1363         }
1364         if (pp->offset) {
1365                 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
1366                 if (ret <= 0)
1367                         goto error;
1368         }
1369         if (pp->line) {
1370                 ret = e_snprintf(line, 32, ":%d", pp->line);
1371                 if (ret <= 0)
1372                         goto error;
1373         }
1374         if (pp->file) {
1375                 tmp = pp->file;
1376                 len = strlen(tmp);
1377                 if (len > 30) {
1378                         tmp = strchr(pp->file + len - 30, '/');
1379                         tmp = tmp ? tmp + 1 : pp->file + len - 30;
1380                 }
1381                 ret = e_snprintf(file, 32, "@%s", tmp);
1382                 if (ret <= 0)
1383                         goto error;
1384         }
1385 
1386         if (pp->function)
1387                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
1388                                  offs, pp->retprobe ? "%return" : "", line,
1389                                  file);
1390         else
1391                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
1392         if (ret <= 0)
1393                 goto error;
1394 
1395         return buf;
1396 error:
1397         pr_debug("Failed to synthesize perf probe point: %s\n",
1398                  strerror(-ret));
1399         free(buf);
1400         return NULL;
1401 }
1402 
1403 #if 0
1404 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1405 {
1406         char *buf;
1407         int i, len, ret;
1408 
1409         buf = synthesize_perf_probe_point(&pev->point);
1410         if (!buf)
1411                 return NULL;
1412 
1413         len = strlen(buf);
1414         for (i = 0; i < pev->nargs; i++) {
1415                 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
1416                                  pev->args[i].name);
1417                 if (ret <= 0) {
1418                         free(buf);
1419                         return NULL;
1420                 }
1421                 len += ret;
1422         }
1423 
1424         return buf;
1425 }
1426 #endif
1427 
1428 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1429                                              char **buf, size_t *buflen,
1430                                              int depth)
1431 {
1432         int ret;
1433         if (ref->next) {
1434                 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1435                                                          buflen, depth + 1);
1436                 if (depth < 0)
1437                         goto out;
1438         }
1439 
1440         ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
1441         if (ret < 0)
1442                 depth = ret;
1443         else {
1444                 *buf += ret;
1445                 *buflen -= ret;
1446         }
1447 out:
1448         return depth;
1449 
1450 }
1451 
1452 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1453                                        char *buf, size_t buflen)
1454 {
1455         struct probe_trace_arg_ref *ref = arg->ref;
1456         int ret, depth = 0;
1457         char *tmp = buf;
1458 
1459         /* Argument name or separator */
1460         if (arg->name)
1461                 ret = e_snprintf(buf, buflen, " %s=", arg->name);
1462         else
1463                 ret = e_snprintf(buf, buflen, " ");
1464         if (ret < 0)
1465                 return ret;
1466         buf += ret;
1467         buflen -= ret;
1468 
1469         /* Special case: @XXX */
1470         if (arg->value[0] == '@' && arg->ref)
1471                         ref = ref->next;
1472 
1473         /* Dereferencing arguments */
1474         if (ref) {
1475                 depth = __synthesize_probe_trace_arg_ref(ref, &buf,
1476                                                           &buflen, 1);
1477                 if (depth < 0)
1478                         return depth;
1479         }
1480 
1481         /* Print argument value */
1482         if (arg->value[0] == '@' && arg->ref)
1483                 ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
1484                                  arg->ref->offset);
1485         else
1486                 ret = e_snprintf(buf, buflen, "%s", arg->value);
1487         if (ret < 0)
1488                 return ret;
1489         buf += ret;
1490         buflen -= ret;
1491 
1492         /* Closing */
1493         while (depth--) {
1494                 ret = e_snprintf(buf, buflen, ")");
1495                 if (ret < 0)
1496                         return ret;
1497                 buf += ret;
1498                 buflen -= ret;
1499         }
1500         /* Print argument type */
1501         if (arg->type) {
1502                 ret = e_snprintf(buf, buflen, ":%s", arg->type);
1503                 if (ret <= 0)
1504                         return ret;
1505                 buf += ret;
1506         }
1507 
1508         return buf - tmp;
1509 }
1510 
1511 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1512 {
1513         struct probe_trace_point *tp = &tev->point;
1514         char *buf;
1515         int i, len, ret;
1516 
1517         buf = zalloc(MAX_CMDLEN);
1518         if (buf == NULL)
1519                 return NULL;
1520 
1521         if (tev->uprobes)
1522                 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s:%s",
1523                                  tp->retprobe ? 'r' : 'p',
1524                                  tev->group, tev->event,
1525                                  tp->module, tp->symbol);
1526         else
1527                 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s%s%s+%lu",
1528                                  tp->retprobe ? 'r' : 'p',
1529                                  tev->group, tev->event,
1530                                  tp->module ?: "", tp->module ? ":" : "",
1531                                  tp->symbol, tp->offset);
1532 
1533         if (len <= 0)
1534                 goto error;
1535 
1536         for (i = 0; i < tev->nargs; i++) {
1537                 ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
1538                                                   MAX_CMDLEN - len);
1539                 if (ret <= 0)
1540                         goto error;
1541                 len += ret;
1542         }
1543 
1544         return buf;
1545 error:
1546         free(buf);
1547         return NULL;
1548 }
1549 
1550 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1551                                struct perf_probe_event *pev, bool is_kprobe)
1552 {
1553         char buf[64] = "";
1554         int i, ret;
1555 
1556         /* Convert event/group name */
1557         pev->event = strdup(tev->event);
1558         pev->group = strdup(tev->group);
1559         if (pev->event == NULL || pev->group == NULL)
1560                 return -ENOMEM;
1561 
1562         /* Convert trace_point to probe_point */
1563         if (is_kprobe)
1564                 ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point);
1565         else
1566                 ret = convert_to_perf_probe_point(&tev->point, &pev->point);
1567 
1568         if (ret < 0)
1569                 return ret;
1570 
1571         /* Convert trace_arg to probe_arg */
1572         pev->nargs = tev->nargs;
1573         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1574         if (pev->args == NULL)
1575                 return -ENOMEM;
1576         for (i = 0; i < tev->nargs && ret >= 0; i++) {
1577                 if (tev->args[i].name)
1578                         pev->args[i].name = strdup(tev->args[i].name);
1579                 else {
1580                         ret = synthesize_probe_trace_arg(&tev->args[i],
1581                                                           buf, 64);
1582                         pev->args[i].name = strdup(buf);
1583                 }
1584                 if (pev->args[i].name == NULL && ret >= 0)
1585                         ret = -ENOMEM;
1586         }
1587 
1588         if (ret < 0)
1589                 clear_perf_probe_event(pev);
1590 
1591         return ret;
1592 }
1593 
1594 void clear_perf_probe_event(struct perf_probe_event *pev)
1595 {
1596         struct perf_probe_point *pp = &pev->point;
1597         struct perf_probe_arg_field *field, *next;
1598         int i;
1599 
1600         free(pev->event);
1601         free(pev->group);
1602         free(pp->file);
1603         free(pp->function);
1604         free(pp->lazy_line);
1605 
1606         for (i = 0; i < pev->nargs; i++) {
1607                 free(pev->args[i].name);
1608                 free(pev->args[i].var);
1609                 free(pev->args[i].type);
1610                 field = pev->args[i].field;
1611                 while (field) {
1612                         next = field->next;
1613                         zfree(&field->name);
1614                         free(field);
1615                         field = next;
1616                 }
1617         }
1618         free(pev->args);
1619         memset(pev, 0, sizeof(*pev));
1620 }
1621 
1622 static void clear_probe_trace_event(struct probe_trace_event *tev)
1623 {
1624         struct probe_trace_arg_ref *ref, *next;
1625         int i;
1626 
1627         free(tev->event);
1628         free(tev->group);
1629         free(tev->point.symbol);
1630         free(tev->point.module);
1631         for (i = 0; i < tev->nargs; i++) {
1632                 free(tev->args[i].name);
1633                 free(tev->args[i].value);
1634                 free(tev->args[i].type);
1635                 ref = tev->args[i].ref;
1636                 while (ref) {
1637                         next = ref->next;
1638                         free(ref);
1639                         ref = next;
1640                 }
1641         }
1642         free(tev->args);
1643         memset(tev, 0, sizeof(*tev));
1644 }
1645 
1646 static void print_warn_msg(const char *file, bool is_kprobe)
1647 {
1648 
1649         if (errno == ENOENT) {
1650                 const char *config;
1651 
1652                 if (!is_kprobe)
1653                         config = "CONFIG_UPROBE_EVENTS";
1654                 else
1655                         config = "CONFIG_KPROBE_EVENTS";
1656 
1657                 pr_warning("%s file does not exist - please rebuild kernel"
1658                                 " with %s.\n", file, config);
1659         } else
1660                 pr_warning("Failed to open %s file: %s\n", file,
1661                                 strerror(errno));
1662 }
1663 
1664 static int open_probe_events(const char *trace_file, bool readwrite,
1665                                 bool is_kprobe)
1666 {
1667         char buf[PATH_MAX];
1668         const char *__debugfs;
1669         int ret;
1670 
1671         __debugfs = debugfs_find_mountpoint();
1672         if (__debugfs == NULL) {
1673                 pr_warning("Debugfs is not mounted.\n");
1674                 return -ENOENT;
1675         }
1676 
1677         ret = e_snprintf(buf, PATH_MAX, "%s/%s", __debugfs, trace_file);
1678         if (ret >= 0) {
1679                 pr_debug("Opening %s write=%d\n", buf, readwrite);
1680                 if (readwrite && !probe_event_dry_run)
1681                         ret = open(buf, O_RDWR, O_APPEND);
1682                 else
1683                         ret = open(buf, O_RDONLY, 0);
1684 
1685                 if (ret < 0)
1686                         print_warn_msg(buf, is_kprobe);
1687         }
1688         return ret;
1689 }
1690 
1691 static int open_kprobe_events(bool readwrite)
1692 {
1693         return open_probe_events("tracing/kprobe_events", readwrite, true);
1694 }
1695 
1696 static int open_uprobe_events(bool readwrite)
1697 {
1698         return open_probe_events("tracing/uprobe_events", readwrite, false);
1699 }
1700 
1701 /* Get raw string list of current kprobe_events  or uprobe_events */
1702 static struct strlist *get_probe_trace_command_rawlist(int fd)
1703 {
1704         int ret, idx;
1705         FILE *fp;
1706         char buf[MAX_CMDLEN];
1707         char *p;
1708         struct strlist *sl;
1709 
1710         sl = strlist__new(true, NULL);
1711 
1712         fp = fdopen(dup(fd), "r");
1713         while (!feof(fp)) {
1714                 p = fgets(buf, MAX_CMDLEN, fp);
1715                 if (!p)
1716                         break;
1717 
1718                 idx = strlen(p) - 1;
1719                 if (p[idx] == '\n')
1720                         p[idx] = '\0';
1721                 ret = strlist__add(sl, buf);
1722                 if (ret < 0) {
1723                         pr_debug("strlist__add failed: %s\n", strerror(-ret));
1724                         strlist__delete(sl);
1725                         return NULL;
1726                 }
1727         }
1728         fclose(fp);
1729 
1730         return sl;
1731 }
1732 
1733 /* Show an event */
1734 static int show_perf_probe_event(struct perf_probe_event *pev)
1735 {
1736         int i, ret;
1737         char buf[128];
1738         char *place;
1739 
1740         /* Synthesize only event probe point */
1741         place = synthesize_perf_probe_point(&pev->point);
1742         if (!place)
1743                 return -EINVAL;
1744 
1745         ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1746         if (ret < 0)
1747                 return ret;
1748 
1749         printf("  %-20s (on %s", buf, place);
1750 
1751         if (pev->nargs > 0) {
1752                 printf(" with");
1753                 for (i = 0; i < pev->nargs; i++) {
1754                         ret = synthesize_perf_probe_arg(&pev->args[i],
1755                                                         buf, 128);
1756                         if (ret < 0)
1757                                 break;
1758                         printf(" %s", buf);
1759                 }
1760         }
1761         printf(")\n");
1762         free(place);
1763         return ret;
1764 }
1765 
1766 static int __show_perf_probe_events(int fd, bool is_kprobe)
1767 {
1768         int ret = 0;
1769         struct probe_trace_event tev;
1770         struct perf_probe_event pev;
1771         struct strlist *rawlist;
1772         struct str_node *ent;
1773 
1774         memset(&tev, 0, sizeof(tev));
1775         memset(&pev, 0, sizeof(pev));
1776 
1777         rawlist = get_probe_trace_command_rawlist(fd);
1778         if (!rawlist)
1779                 return -ENOENT;
1780 
1781         strlist__for_each(ent, rawlist) {
1782                 ret = parse_probe_trace_command(ent->s, &tev);
1783                 if (ret >= 0) {
1784                         ret = convert_to_perf_probe_event(&tev, &pev,
1785                                                                 is_kprobe);
1786                         if (ret >= 0)
1787                                 ret = show_perf_probe_event(&pev);
1788                 }
1789                 clear_perf_probe_event(&pev);
1790                 clear_probe_trace_event(&tev);
1791                 if (ret < 0)
1792                         break;
1793         }
1794         strlist__delete(rawlist);
1795 
1796         return ret;
1797 }
1798 
1799 /* List up current perf-probe events */
1800 int show_perf_probe_events(void)
1801 {
1802         int fd, ret;
1803 
1804         setup_pager();
1805         fd = open_kprobe_events(false);
1806 
1807         if (fd < 0)
1808                 return fd;
1809 
1810         ret = init_vmlinux();
1811         if (ret < 0)
1812                 return ret;
1813 
1814         ret = __show_perf_probe_events(fd, true);
1815         close(fd);
1816 
1817         fd = open_uprobe_events(false);
1818         if (fd >= 0) {
1819                 ret = __show_perf_probe_events(fd, false);
1820                 close(fd);
1821         }
1822 
1823         return ret;
1824 }
1825 
1826 /* Get current perf-probe event names */
1827 static struct strlist *get_probe_trace_event_names(int fd, bool include_group)
1828 {
1829         char buf[128];
1830         struct strlist *sl, *rawlist;
1831         struct str_node *ent;
1832         struct probe_trace_event tev;
1833         int ret = 0;
1834 
1835         memset(&tev, 0, sizeof(tev));
1836         rawlist = get_probe_trace_command_rawlist(fd);
1837         sl = strlist__new(true, NULL);
1838         strlist__for_each(ent, rawlist) {
1839                 ret = parse_probe_trace_command(ent->s, &tev);
1840                 if (ret < 0)
1841                         break;
1842                 if (include_group) {
1843                         ret = e_snprintf(buf, 128, "%s:%s", tev.group,
1844                                         tev.event);
1845                         if (ret >= 0)
1846                                 ret = strlist__add(sl, buf);
1847                 } else
1848                         ret = strlist__add(sl, tev.event);
1849                 clear_probe_trace_event(&tev);
1850                 if (ret < 0)
1851                         break;
1852         }
1853         strlist__delete(rawlist);
1854 
1855         if (ret < 0) {
1856                 strlist__delete(sl);
1857                 return NULL;
1858         }
1859         return sl;
1860 }
1861 
1862 static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
1863 {
1864         int ret = 0;
1865         char *buf = synthesize_probe_trace_command(tev);
1866 
1867         if (!buf) {
1868                 pr_debug("Failed to synthesize probe trace event.\n");
1869                 return -EINVAL;
1870         }
1871 
1872         pr_debug("Writing event: %s\n", buf);
1873         if (!probe_event_dry_run) {
1874                 ret = write(fd, buf, strlen(buf));
1875                 if (ret <= 0)
1876                         pr_warning("Failed to write event: %s\n",
1877                                    strerror(errno));
1878         }
1879         free(buf);
1880         return ret;
1881 }
1882 
1883 static int get_new_event_name(char *buf, size_t len, const char *base,
1884                               struct strlist *namelist, bool allow_suffix)
1885 {
1886         int i, ret;
1887 
1888         /* Try no suffix */
1889         ret = e_snprintf(buf, len, "%s", base);
1890         if (ret < 0) {
1891                 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1892                 return ret;
1893         }
1894         if (!strlist__has_entry(namelist, buf))
1895                 return 0;
1896 
1897         if (!allow_suffix) {
1898                 pr_warning("Error: event \"%s\" already exists. "
1899                            "(Use -f to force duplicates.)\n", base);
1900                 return -EEXIST;
1901         }
1902 
1903         /* Try to add suffix */
1904         for (i = 1; i < MAX_EVENT_INDEX; i++) {
1905                 ret = e_snprintf(buf, len, "%s_%d", base, i);
1906                 if (ret < 0) {
1907                         pr_debug("snprintf() failed: %s\n", strerror(-ret));
1908                         return ret;
1909                 }
1910                 if (!strlist__has_entry(namelist, buf))
1911                         break;
1912         }
1913         if (i == MAX_EVENT_INDEX) {
1914                 pr_warning("Too many events are on the same function.\n");
1915                 ret = -ERANGE;
1916         }
1917 
1918         return ret;
1919 }
1920 
1921 static int __add_probe_trace_events(struct perf_probe_event *pev,
1922                                      struct probe_trace_event *tevs,
1923                                      int ntevs, bool allow_suffix)
1924 {
1925         int i, fd, ret;
1926         struct probe_trace_event *tev = NULL;
1927         char buf[64];
1928         const char *event, *group;
1929         struct strlist *namelist;
1930 
1931         if (pev->uprobes)
1932                 fd = open_uprobe_events(true);
1933         else
1934                 fd = open_kprobe_events(true);
1935 
1936         if (fd < 0)
1937                 return fd;
1938         /* Get current event names */
1939         namelist = get_probe_trace_event_names(fd, false);
1940         if (!namelist) {
1941                 pr_debug("Failed to get current event list.\n");
1942                 return -EIO;
1943         }
1944 
1945         ret = 0;
1946         printf("Added new event%s\n", (ntevs > 1) ? "s:" : ":");
1947         for (i = 0; i < ntevs; i++) {
1948                 tev = &tevs[i];
1949                 if (pev->event)
1950                         event = pev->event;
1951                 else
1952                         if (pev->point.function)
1953                                 event = pev->point.function;
1954                         else
1955                                 event = tev->point.symbol;
1956                 if (pev->group)
1957                         group = pev->group;
1958                 else
1959                         group = PERFPROBE_GROUP;
1960 
1961                 /* Get an unused new event name */
1962                 ret = get_new_event_name(buf, 64, event,
1963                                          namelist, allow_suffix);
1964                 if (ret < 0)
1965                         break;
1966                 event = buf;
1967 
1968                 tev->event = strdup(event);
1969                 tev->group = strdup(group);
1970                 if (tev->event == NULL || tev->group == NULL) {
1971                         ret = -ENOMEM;
1972                         break;
1973                 }
1974                 ret = write_probe_trace_event(fd, tev);
1975                 if (ret < 0)
1976                         break;
1977                 /* Add added event name to namelist */
1978                 strlist__add(namelist, event);
1979 
1980                 /* Trick here - save current event/group */
1981                 event = pev->event;
1982                 group = pev->group;
1983                 pev->event = tev->event;
1984                 pev->group = tev->group;
1985                 show_perf_probe_event(pev);
1986                 /* Trick here - restore current event/group */
1987                 pev->event = (char *)event;
1988                 pev->group = (char *)group;
1989 
1990                 /*
1991                  * Probes after the first probe which comes from same
1992                  * user input are always allowed to add suffix, because
1993                  * there might be several addresses corresponding to
1994                  * one code line.
1995                  */
1996                 allow_suffix = true;
1997         }
1998 
1999         if (ret >= 0) {
2000                 /* Show how to use the event. */
2001                 printf("\nYou can now use it in all perf tools, such as:\n\n");
2002                 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
2003                          tev->event);
2004         }
2005 
2006         strlist__delete(namelist);
2007         close(fd);
2008         return ret;
2009 }
2010 
2011 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
2012                                           struct probe_trace_event **tevs,
2013                                           int max_tevs, const char *target)
2014 {
2015         struct symbol *sym;
2016         int ret, i;
2017         struct probe_trace_event *tev;
2018 
2019         if (pev->uprobes && !pev->group) {
2020                 /* Replace group name if not given */
2021                 ret = convert_exec_to_group(target, &pev->group);
2022                 if (ret != 0) {
2023                         pr_warning("Failed to make a group name.\n");
2024                         return ret;
2025                 }
2026         }
2027 
2028         /* Convert perf_probe_event with debuginfo */
2029         ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, target);
2030         if (ret != 0)
2031                 return ret;     /* Found in debuginfo or got an error */
2032 
2033         if (pev->uprobes) {
2034                 ret = convert_name_to_addr(pev, target);
2035                 if (ret < 0)
2036                         return ret;
2037         }
2038 
2039         /* Allocate trace event buffer */
2040         tev = *tevs = zalloc(sizeof(struct probe_trace_event));
2041         if (tev == NULL)
2042                 return -ENOMEM;
2043 
2044         /* Copy parameters */
2045         tev->point.symbol = strdup(pev->point.function);
2046         if (tev->point.symbol == NULL) {
2047                 ret = -ENOMEM;
2048                 goto error;
2049         }
2050 
2051         if (target) {
2052                 tev->point.module = strdup(target);
2053                 if (tev->point.module == NULL) {
2054                         ret = -ENOMEM;
2055                         goto error;
2056                 }
2057         }
2058 
2059         tev->point.offset = pev->point.offset;
2060         tev->point.retprobe = pev->point.retprobe;
2061         tev->nargs = pev->nargs;
2062         tev->uprobes = pev->uprobes;
2063 
2064         if (tev->nargs) {
2065                 tev->args = zalloc(sizeof(struct probe_trace_arg)
2066                                    * tev->nargs);
2067                 if (tev->args == NULL) {
2068                         ret = -ENOMEM;
2069                         goto error;
2070                 }
2071                 for (i = 0; i < tev->nargs; i++) {
2072                         if (pev->args[i].name) {
2073                                 tev->args[i].name = strdup(pev->args[i].name);
2074                                 if (tev->args[i].name == NULL) {
2075                                         ret = -ENOMEM;
2076                                         goto error;
2077                                 }
2078                         }
2079                         tev->args[i].value = strdup(pev->args[i].var);
2080                         if (tev->args[i].value == NULL) {
2081                                 ret = -ENOMEM;
2082                                 goto error;
2083                         }
2084                         if (pev->args[i].type) {
2085                                 tev->args[i].type = strdup(pev->args[i].type);
2086                                 if (tev->args[i].type == NULL) {
2087                                         ret = -ENOMEM;
2088                                         goto error;
2089                                 }
2090                         }
2091                 }
2092         }
2093 
2094         if (pev->uprobes)
2095                 return 1;
2096 
2097         /* Currently just checking function name from symbol map */
2098         sym = __find_kernel_function_by_name(tev->point.symbol, NULL);
2099         if (!sym) {
2100                 pr_warning("Kernel symbol \'%s\' not found.\n",
2101                            tev->point.symbol);
2102                 ret = -ENOENT;
2103                 goto error;
2104         } else if (tev->point.offset > sym->end - sym->start) {
2105                 pr_warning("Offset specified is greater than size of %s\n",
2106                            tev->point.symbol);
2107                 ret = -ENOENT;
2108                 goto error;
2109 
2110         }
2111 
2112         return 1;
2113 error:
2114         clear_probe_trace_event(tev);
2115         free(tev);
2116         *tevs = NULL;
2117         return ret;
2118 }
2119 
2120 struct __event_package {
2121         struct perf_probe_event         *pev;
2122         struct probe_trace_event        *tevs;
2123         int                             ntevs;
2124 };
2125 
2126 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
2127                           int max_tevs, const char *target, bool force_add)
2128 {
2129         int i, j, ret;
2130         struct __event_package *pkgs;
2131 
2132         ret = 0;
2133         pkgs = zalloc(sizeof(struct __event_package) * npevs);
2134 
2135         if (pkgs == NULL)
2136                 return -ENOMEM;
2137 
2138         if (!pevs->uprobes)
2139                 /* Init vmlinux path */
2140                 ret = init_vmlinux();
2141         else
2142                 ret = init_user_exec();
2143 
2144         if (ret < 0) {
2145                 free(pkgs);
2146                 return ret;
2147         }
2148 
2149         /* Loop 1: convert all events */
2150         for (i = 0; i < npevs; i++) {
2151                 pkgs[i].pev = &pevs[i];
2152                 /* Convert with or without debuginfo */
2153                 ret  = convert_to_probe_trace_events(pkgs[i].pev,
2154                                                      &pkgs[i].tevs,
2155                                                      max_tevs,
2156                                                      target);
2157                 if (ret < 0)
2158                         goto end;
2159                 pkgs[i].ntevs = ret;
2160         }
2161 
2162         /* Loop 2: add all events */
2163         for (i = 0; i < npevs; i++) {
2164                 ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
2165                                                 pkgs[i].ntevs, force_add);
2166                 if (ret < 0)
2167                         break;
2168         }
2169 end:
2170         /* Loop 3: cleanup and free trace events  */
2171         for (i = 0; i < npevs; i++) {
2172                 for (j = 0; j < pkgs[i].ntevs; j++)
2173                         clear_probe_trace_event(&pkgs[i].tevs[j]);
2174                 zfree(&pkgs[i].tevs);
2175         }
2176         free(pkgs);
2177 
2178         return ret;
2179 }
2180 
2181 static int __del_trace_probe_event(int fd, struct str_node *ent)
2182 {
2183         char *p;
2184         char buf[128];
2185         int ret;
2186 
2187         /* Convert from perf-probe event to trace-probe event */
2188         ret = e_snprintf(buf, 128, "-:%s", ent->s);
2189         if (ret < 0)
2190                 goto error;
2191 
2192         p = strchr(buf + 2, ':');
2193         if (!p) {
2194                 pr_debug("Internal error: %s should have ':' but not.\n",
2195                          ent->s);
2196                 ret = -ENOTSUP;
2197                 goto error;
2198         }
2199         *p = '/';
2200 
2201         pr_debug("Writing event: %s\n", buf);
2202         ret = write(fd, buf, strlen(buf));
2203         if (ret < 0) {
2204                 ret = -errno;
2205                 goto error;
2206         }
2207 
2208         printf("Removed event: %s\n", ent->s);
2209         return 0;
2210 error:
2211         pr_warning("Failed to delete event: %s\n", strerror(-ret));
2212         return ret;
2213 }
2214 
2215 static int del_trace_probe_event(int fd, const char *buf,
2216                                                   struct strlist *namelist)
2217 {
2218         struct str_node *ent, *n;
2219         int ret = -1;
2220 
2221         if (strpbrk(buf, "*?")) { /* Glob-exp */
2222                 strlist__for_each_safe(ent, n, namelist)
2223                         if (strglobmatch(ent->s, buf)) {
2224                                 ret = __del_trace_probe_event(fd, ent);
2225                                 if (ret < 0)
2226                                         break;
2227                                 strlist__remove(namelist, ent);
2228                         }
2229         } else {
2230                 ent = strlist__find(namelist, buf);
2231                 if (ent) {
2232                         ret = __del_trace_probe_event(fd, ent);
2233                         if (ret >= 0)
2234                                 strlist__remove(namelist, ent);
2235                 }
2236         }
2237 
2238         return ret;
2239 }
2240 
2241 int del_perf_probe_events(struct strlist *dellist)
2242 {
2243         int ret = -1, ufd = -1, kfd = -1;
2244         char buf[128];
2245         const char *group, *event;
2246         char *p, *str;
2247         struct str_node *ent;
2248         struct strlist *namelist = NULL, *unamelist = NULL;
2249 
2250         /* Get current event names */
2251         kfd = open_kprobe_events(true);
2252         if (kfd < 0)
2253                 return kfd;
2254 
2255         namelist = get_probe_trace_event_names(kfd, true);
2256         ufd = open_uprobe_events(true);
2257 
2258         if (ufd >= 0)
2259                 unamelist = get_probe_trace_event_names(ufd, true);
2260 
2261         if (namelist == NULL && unamelist == NULL)
2262                 goto error;
2263 
2264         strlist__for_each(ent, dellist) {
2265                 str = strdup(ent->s);
2266                 if (str == NULL) {
2267                         ret = -ENOMEM;
2268                         goto error;
2269                 }
2270                 pr_debug("Parsing: %s\n", str);
2271                 p = strchr(str, ':');
2272                 if (p) {
2273                         group = str;
2274                         *p = '\0';
2275                         event = p + 1;
2276                 } else {
2277                         group = "*";
2278                         event = str;
2279                 }
2280 
2281                 ret = e_snprintf(buf, 128, "%s:%s", group, event);
2282                 if (ret < 0) {
2283                         pr_err("Failed to copy event.");
2284                         free(str);
2285                         goto error;
2286                 }
2287 
2288                 pr_debug("Group: %s, Event: %s\n", group, event);
2289 
2290                 if (namelist)
2291                         ret = del_trace_probe_event(kfd, buf, namelist);
2292 
2293                 if (unamelist && ret != 0)
2294                         ret = del_trace_probe_event(ufd, buf, unamelist);
2295 
2296                 if (ret != 0)
2297                         pr_info("Info: Event \"%s\" does not exist.\n", buf);
2298 
2299                 free(str);
2300         }
2301 
2302 error:
2303         if (kfd >= 0) {
2304                 strlist__delete(namelist);
2305                 close(kfd);
2306         }
2307 
2308         if (ufd >= 0) {
2309                 strlist__delete(unamelist);
2310                 close(ufd);
2311         }
2312 
2313         return ret;
2314 }
2315 
2316 /* TODO: don't use a global variable for filter ... */
2317 static struct strfilter *available_func_filter;
2318 
2319 /*
2320  * If a symbol corresponds to a function with global binding and
2321  * matches filter return 0. For all others return 1.
2322  */
2323 static int filter_available_functions(struct map *map __maybe_unused,
2324                                       struct symbol *sym)
2325 {
2326         if (sym->binding == STB_GLOBAL &&
2327             strfilter__compare(available_func_filter, sym->name))
2328                 return 0;
2329         return 1;
2330 }
2331 
2332 static int __show_available_funcs(struct map *map)
2333 {
2334         if (map__load(map, filter_available_functions)) {
2335                 pr_err("Failed to load map.\n");
2336                 return -EINVAL;
2337         }
2338         if (!dso__sorted_by_name(map->dso, map->type))
2339                 dso__sort_by_name(map->dso, map->type);
2340 
2341         dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
2342         return 0;
2343 }
2344 
2345 static int available_kernel_funcs(const char *module)
2346 {
2347         struct map *map;
2348         int ret;
2349 
2350         ret = init_vmlinux();
2351         if (ret < 0)
2352                 return ret;
2353 
2354         map = kernel_get_module_map(module);
2355         if (!map) {
2356                 pr_err("Failed to find %s map.\n", (module) ? : "kernel");
2357                 return -EINVAL;
2358         }
2359         return __show_available_funcs(map);
2360 }
2361 
2362 static int available_user_funcs(const char *target)
2363 {
2364         struct map *map;
2365         int ret;
2366 
2367         ret = init_user_exec();
2368         if (ret < 0)
2369                 return ret;
2370 
2371         map = dso__new_map(target);
2372         ret = __show_available_funcs(map);
2373         dso__delete(map->dso);
2374         map__delete(map);
2375         return ret;
2376 }
2377 
2378 int show_available_funcs(const char *target, struct strfilter *_filter,
2379                                         bool user)
2380 {
2381         setup_pager();
2382         available_func_filter = _filter;
2383 
2384         if (!user)
2385                 return available_kernel_funcs(target);
2386 
2387         return available_user_funcs(target);
2388 }
2389 
2390 /*
2391  * uprobe_events only accepts address:
2392  * Convert function and any offset to address
2393  */
2394 static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
2395 {
2396         struct perf_probe_point *pp = &pev->point;
2397         struct symbol *sym;
2398         struct map *map = NULL;
2399         char *function = NULL;
2400         int ret = -EINVAL;
2401         unsigned long long vaddr = 0;
2402 
2403         if (!pp->function) {
2404                 pr_warning("No function specified for uprobes");
2405                 goto out;
2406         }
2407 
2408         function = strdup(pp->function);
2409         if (!function) {
2410                 pr_warning("Failed to allocate memory by strdup.\n");
2411                 ret = -ENOMEM;
2412                 goto out;
2413         }
2414 
2415         map = dso__new_map(exec);
2416         if (!map) {
2417                 pr_warning("Cannot find appropriate DSO for %s.\n", exec);
2418                 goto out;
2419         }
2420         available_func_filter = strfilter__new(function, NULL);
2421         if (map__load(map, filter_available_functions)) {
2422                 pr_err("Failed to load map.\n");
2423                 goto out;
2424         }
2425 
2426         sym = map__find_symbol_by_name(map, function, NULL);
2427         if (!sym) {
2428                 pr_warning("Cannot find %s in DSO %s\n", function, exec);
2429                 goto out;
2430         }
2431 
2432         if (map->start > sym->start)
2433                 vaddr = map->start;
2434         vaddr += sym->start + pp->offset + map->pgoff;
2435         pp->offset = 0;
2436 
2437         if (!pev->event) {
2438                 pev->event = function;
2439                 function = NULL;
2440         }
2441         if (!pev->group) {
2442                 char *ptr1, *ptr2, *exec_copy;
2443 
2444                 pev->group = zalloc(sizeof(char *) * 64);
2445                 exec_copy = strdup(exec);
2446                 if (!exec_copy) {
2447                         ret = -ENOMEM;
2448                         pr_warning("Failed to copy exec string.\n");
2449                         goto out;
2450                 }
2451 
2452                 ptr1 = strdup(basename(exec_copy));
2453                 if (ptr1) {
2454                         ptr2 = strpbrk(ptr1, "-._");
2455                         if (ptr2)
2456                                 *ptr2 = '\0';
2457                         e_snprintf(pev->group, 64, "%s_%s", PERFPROBE_GROUP,
2458                                         ptr1);
2459                         free(ptr1);
2460                 }
2461                 free(exec_copy);
2462         }
2463         free(pp->function);
2464         pp->function = zalloc(sizeof(char *) * MAX_PROBE_ARGS);
2465         if (!pp->function) {
2466                 ret = -ENOMEM;
2467                 pr_warning("Failed to allocate memory by zalloc.\n");
2468                 goto out;
2469         }
2470         e_snprintf(pp->function, MAX_PROBE_ARGS, "0x%llx", vaddr);
2471         ret = 0;
2472 
2473 out:
2474         if (map) {
2475                 dso__delete(map->dso);
2476                 map__delete(map);
2477         }
2478         if (function)
2479                 free(function);
2480         return ret;
2481 }
2482 

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