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TOMOYO Linux Cross Reference
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/fs.h>
 44 #include "trace-event.h"        /* For __maybe_unused */
 45 #include "probe-event.h"
 46 #include "probe-finder.h"
 47 #include "probe-file.h"
 48 #include "session.h"
 49 
 50 #define MAX_CMDLEN 256
 51 #define PERFPROBE_GROUP "probe"
 52 
 53 bool probe_event_dry_run;       /* Dry run flag */
 54 struct probe_conf probe_conf;
 55 
 56 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
 57 
 58 int e_snprintf(char *str, size_t size, const char *format, ...)
 59 {
 60         int ret;
 61         va_list ap;
 62         va_start(ap, format);
 63         ret = vsnprintf(str, size, format, ap);
 64         va_end(ap);
 65         if (ret >= (int)size)
 66                 ret = -E2BIG;
 67         return ret;
 68 }
 69 
 70 static struct machine *host_machine;
 71 
 72 /* Initialize symbol maps and path of vmlinux/modules */
 73 int init_probe_symbol_maps(bool user_only)
 74 {
 75         int ret;
 76 
 77         symbol_conf.sort_by_name = true;
 78         symbol_conf.allow_aliases = true;
 79         ret = symbol__init(NULL);
 80         if (ret < 0) {
 81                 pr_debug("Failed to init symbol map.\n");
 82                 goto out;
 83         }
 84 
 85         if (host_machine || user_only)  /* already initialized */
 86                 return 0;
 87 
 88         if (symbol_conf.vmlinux_name)
 89                 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
 90 
 91         host_machine = machine__new_host();
 92         if (!host_machine) {
 93                 pr_debug("machine__new_host() failed.\n");
 94                 symbol__exit();
 95                 ret = -1;
 96         }
 97 out:
 98         if (ret < 0)
 99                 pr_warning("Failed to init vmlinux path.\n");
100         return ret;
101 }
102 
103 void exit_probe_symbol_maps(void)
104 {
105         machine__delete(host_machine);
106         host_machine = NULL;
107         symbol__exit();
108 }
109 
110 static struct symbol *__find_kernel_function_by_name(const char *name,
111                                                      struct map **mapp)
112 {
113         return machine__find_kernel_function_by_name(host_machine, name, mapp,
114                                                      NULL);
115 }
116 
117 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
118 {
119         return machine__find_kernel_function(host_machine, addr, mapp, NULL);
120 }
121 
122 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
123 {
124         /* kmap->ref_reloc_sym should be set if host_machine is initialized */
125         struct kmap *kmap;
126         struct map *map = machine__kernel_map(host_machine);
127 
128         if (map__load(map, NULL) < 0)
129                 return NULL;
130 
131         kmap = map__kmap(map);
132         if (!kmap)
133                 return NULL;
134         return kmap->ref_reloc_sym;
135 }
136 
137 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
138                                              bool reloc, bool reladdr)
139 {
140         struct ref_reloc_sym *reloc_sym;
141         struct symbol *sym;
142         struct map *map;
143 
144         /* ref_reloc_sym is just a label. Need a special fix*/
145         reloc_sym = kernel_get_ref_reloc_sym();
146         if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
147                 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
148         else {
149                 sym = __find_kernel_function_by_name(name, &map);
150                 if (!sym)
151                         return -ENOENT;
152                 *addr = map->unmap_ip(map, sym->start) -
153                         ((reloc) ? 0 : map->reloc) -
154                         ((reladdr) ? map->start : 0);
155         }
156         return 0;
157 }
158 
159 static struct map *kernel_get_module_map(const char *module)
160 {
161         struct map_groups *grp = &host_machine->kmaps;
162         struct maps *maps = &grp->maps[MAP__FUNCTION];
163         struct map *pos;
164 
165         /* A file path -- this is an offline module */
166         if (module && strchr(module, '/'))
167                 return machine__findnew_module_map(host_machine, 0, module);
168 
169         if (!module)
170                 module = "kernel";
171 
172         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
173                 /* short_name is "[module]" */
174                 if (strncmp(pos->dso->short_name + 1, module,
175                             pos->dso->short_name_len - 2) == 0 &&
176                     module[pos->dso->short_name_len - 2] == '\0') {
177                         return pos;
178                 }
179         }
180         return NULL;
181 }
182 
183 struct map *get_target_map(const char *target, bool user)
184 {
185         /* Init maps of given executable or kernel */
186         if (user)
187                 return dso__new_map(target);
188         else
189                 return kernel_get_module_map(target);
190 }
191 
192 static void put_target_map(struct map *map, bool user)
193 {
194         if (map && user) {
195                 /* Only the user map needs to be released */
196                 map__put(map);
197         }
198 }
199 
200 
201 static int convert_exec_to_group(const char *exec, char **result)
202 {
203         char *ptr1, *ptr2, *exec_copy;
204         char buf[64];
205         int ret;
206 
207         exec_copy = strdup(exec);
208         if (!exec_copy)
209                 return -ENOMEM;
210 
211         ptr1 = basename(exec_copy);
212         if (!ptr1) {
213                 ret = -EINVAL;
214                 goto out;
215         }
216 
217         ptr2 = strpbrk(ptr1, "-._");
218         if (ptr2)
219                 *ptr2 = '\0';
220         ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
221         if (ret < 0)
222                 goto out;
223 
224         *result = strdup(buf);
225         ret = *result ? 0 : -ENOMEM;
226 
227 out:
228         free(exec_copy);
229         return ret;
230 }
231 
232 static void clear_perf_probe_point(struct perf_probe_point *pp)
233 {
234         free(pp->file);
235         free(pp->function);
236         free(pp->lazy_line);
237 }
238 
239 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
240 {
241         int i;
242 
243         for (i = 0; i < ntevs; i++)
244                 clear_probe_trace_event(tevs + i);
245 }
246 
247 static bool kprobe_blacklist__listed(unsigned long address);
248 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
249 {
250         u64 etext_addr = 0;
251         int ret;
252 
253         /* Get the address of _etext for checking non-probable text symbol */
254         ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
255                                                 false, false);
256 
257         if (ret == 0 && etext_addr < address)
258                 pr_warning("%s is out of .text, skip it.\n", symbol);
259         else if (kprobe_blacklist__listed(address))
260                 pr_warning("%s is blacklisted function, skip it.\n", symbol);
261         else
262                 return false;
263 
264         return true;
265 }
266 
267 /*
268  * NOTE:
269  * '.gnu.linkonce.this_module' section of kernel module elf directly
270  * maps to 'struct module' from linux/module.h. This section contains
271  * actual module name which will be used by kernel after loading it.
272  * But, we cannot use 'struct module' here since linux/module.h is not
273  * exposed to user-space. Offset of 'name' has remained same from long
274  * time, so hardcoding it here.
275  */
276 #ifdef __LP64__
277 #define MOD_NAME_OFFSET 24
278 #else
279 #define MOD_NAME_OFFSET 12
280 #endif
281 
282 /*
283  * @module can be module name of module file path. In case of path,
284  * inspect elf and find out what is actual module name.
285  * Caller has to free mod_name after using it.
286  */
287 static char *find_module_name(const char *module)
288 {
289         int fd;
290         Elf *elf;
291         GElf_Ehdr ehdr;
292         GElf_Shdr shdr;
293         Elf_Data *data;
294         Elf_Scn *sec;
295         char *mod_name = NULL;
296 
297         fd = open(module, O_RDONLY);
298         if (fd < 0)
299                 return NULL;
300 
301         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
302         if (elf == NULL)
303                 goto elf_err;
304 
305         if (gelf_getehdr(elf, &ehdr) == NULL)
306                 goto ret_err;
307 
308         sec = elf_section_by_name(elf, &ehdr, &shdr,
309                         ".gnu.linkonce.this_module", NULL);
310         if (!sec)
311                 goto ret_err;
312 
313         data = elf_getdata(sec, NULL);
314         if (!data || !data->d_buf)
315                 goto ret_err;
316 
317         mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET);
318 
319 ret_err:
320         elf_end(elf);
321 elf_err:
322         close(fd);
323         return mod_name;
324 }
325 
326 #ifdef HAVE_DWARF_SUPPORT
327 
328 static int kernel_get_module_dso(const char *module, struct dso **pdso)
329 {
330         struct dso *dso;
331         struct map *map;
332         const char *vmlinux_name;
333         int ret = 0;
334 
335         if (module) {
336                 char module_name[128];
337 
338                 snprintf(module_name, sizeof(module_name), "[%s]", module);
339                 map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name);
340                 if (map) {
341                         dso = map->dso;
342                         goto found;
343                 }
344                 pr_debug("Failed to find module %s.\n", module);
345                 return -ENOENT;
346         }
347 
348         map = machine__kernel_map(host_machine);
349         dso = map->dso;
350 
351         vmlinux_name = symbol_conf.vmlinux_name;
352         dso->load_errno = 0;
353         if (vmlinux_name)
354                 ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
355         else
356                 ret = dso__load_vmlinux_path(dso, map, NULL);
357 found:
358         *pdso = dso;
359         return ret;
360 }
361 
362 /*
363  * Some binaries like glibc have special symbols which are on the symbol
364  * table, but not in the debuginfo. If we can find the address of the
365  * symbol from map, we can translate the address back to the probe point.
366  */
367 static int find_alternative_probe_point(struct debuginfo *dinfo,
368                                         struct perf_probe_point *pp,
369                                         struct perf_probe_point *result,
370                                         const char *target, bool uprobes)
371 {
372         struct map *map = NULL;
373         struct symbol *sym;
374         u64 address = 0;
375         int ret = -ENOENT;
376 
377         /* This can work only for function-name based one */
378         if (!pp->function || pp->file)
379                 return -ENOTSUP;
380 
381         map = get_target_map(target, uprobes);
382         if (!map)
383                 return -EINVAL;
384 
385         /* Find the address of given function */
386         map__for_each_symbol_by_name(map, pp->function, sym) {
387                 if (uprobes)
388                         address = sym->start;
389                 else
390                         address = map->unmap_ip(map, sym->start) - map->reloc;
391                 break;
392         }
393         if (!address) {
394                 ret = -ENOENT;
395                 goto out;
396         }
397         pr_debug("Symbol %s address found : %" PRIx64 "\n",
398                         pp->function, address);
399 
400         ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
401                                           result);
402         if (ret <= 0)
403                 ret = (!ret) ? -ENOENT : ret;
404         else {
405                 result->offset += pp->offset;
406                 result->line += pp->line;
407                 result->retprobe = pp->retprobe;
408                 ret = 0;
409         }
410 
411 out:
412         put_target_map(map, uprobes);
413         return ret;
414 
415 }
416 
417 static int get_alternative_probe_event(struct debuginfo *dinfo,
418                                        struct perf_probe_event *pev,
419                                        struct perf_probe_point *tmp)
420 {
421         int ret;
422 
423         memcpy(tmp, &pev->point, sizeof(*tmp));
424         memset(&pev->point, 0, sizeof(pev->point));
425         ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
426                                            pev->target, pev->uprobes);
427         if (ret < 0)
428                 memcpy(&pev->point, tmp, sizeof(*tmp));
429 
430         return ret;
431 }
432 
433 static int get_alternative_line_range(struct debuginfo *dinfo,
434                                       struct line_range *lr,
435                                       const char *target, bool user)
436 {
437         struct perf_probe_point pp = { .function = lr->function,
438                                        .file = lr->file,
439                                        .line = lr->start };
440         struct perf_probe_point result;
441         int ret, len = 0;
442 
443         memset(&result, 0, sizeof(result));
444 
445         if (lr->end != INT_MAX)
446                 len = lr->end - lr->start;
447         ret = find_alternative_probe_point(dinfo, &pp, &result,
448                                            target, user);
449         if (!ret) {
450                 lr->function = result.function;
451                 lr->file = result.file;
452                 lr->start = result.line;
453                 if (lr->end != INT_MAX)
454                         lr->end = lr->start + len;
455                 clear_perf_probe_point(&pp);
456         }
457         return ret;
458 }
459 
460 /* Open new debuginfo of given module */
461 static struct debuginfo *open_debuginfo(const char *module, bool silent)
462 {
463         const char *path = module;
464         char reason[STRERR_BUFSIZE];
465         struct debuginfo *ret = NULL;
466         struct dso *dso = NULL;
467         int err;
468 
469         if (!module || !strchr(module, '/')) {
470                 err = kernel_get_module_dso(module, &dso);
471                 if (err < 0) {
472                         if (!dso || dso->load_errno == 0) {
473                                 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
474                                         strcpy(reason, "(unknown)");
475                         } else
476                                 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
477                         if (!silent)
478                                 pr_err("Failed to find the path for %s: %s\n",
479                                         module ?: "kernel", reason);
480                         return NULL;
481                 }
482                 path = dso->long_name;
483         }
484         ret = debuginfo__new(path);
485         if (!ret && !silent) {
486                 pr_warning("The %s file has no debug information.\n", path);
487                 if (!module || !strtailcmp(path, ".ko"))
488                         pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
489                 else
490                         pr_warning("Rebuild with -g, ");
491                 pr_warning("or install an appropriate debuginfo package.\n");
492         }
493         return ret;
494 }
495 
496 /* For caching the last debuginfo */
497 static struct debuginfo *debuginfo_cache;
498 static char *debuginfo_cache_path;
499 
500 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
501 {
502         const char *path = module;
503 
504         /* If the module is NULL, it should be the kernel. */
505         if (!module)
506                 path = "kernel";
507 
508         if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
509                 goto out;
510 
511         /* Copy module path */
512         free(debuginfo_cache_path);
513         debuginfo_cache_path = strdup(path);
514         if (!debuginfo_cache_path) {
515                 debuginfo__delete(debuginfo_cache);
516                 debuginfo_cache = NULL;
517                 goto out;
518         }
519 
520         debuginfo_cache = open_debuginfo(module, silent);
521         if (!debuginfo_cache)
522                 zfree(&debuginfo_cache_path);
523 out:
524         return debuginfo_cache;
525 }
526 
527 static void debuginfo_cache__exit(void)
528 {
529         debuginfo__delete(debuginfo_cache);
530         debuginfo_cache = NULL;
531         zfree(&debuginfo_cache_path);
532 }
533 
534 
535 static int get_text_start_address(const char *exec, unsigned long *address)
536 {
537         Elf *elf;
538         GElf_Ehdr ehdr;
539         GElf_Shdr shdr;
540         int fd, ret = -ENOENT;
541 
542         fd = open(exec, O_RDONLY);
543         if (fd < 0)
544                 return -errno;
545 
546         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
547         if (elf == NULL) {
548                 ret = -EINVAL;
549                 goto out_close;
550         }
551 
552         if (gelf_getehdr(elf, &ehdr) == NULL)
553                 goto out;
554 
555         if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
556                 goto out;
557 
558         *address = shdr.sh_addr - shdr.sh_offset;
559         ret = 0;
560 out:
561         elf_end(elf);
562 out_close:
563         close(fd);
564 
565         return ret;
566 }
567 
568 /*
569  * Convert trace point to probe point with debuginfo
570  */
571 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
572                                             struct perf_probe_point *pp,
573                                             bool is_kprobe)
574 {
575         struct debuginfo *dinfo = NULL;
576         unsigned long stext = 0;
577         u64 addr = tp->address;
578         int ret = -ENOENT;
579 
580         /* convert the address to dwarf address */
581         if (!is_kprobe) {
582                 if (!addr) {
583                         ret = -EINVAL;
584                         goto error;
585                 }
586                 ret = get_text_start_address(tp->module, &stext);
587                 if (ret < 0)
588                         goto error;
589                 addr += stext;
590         } else if (tp->symbol) {
591                 /* If the module is given, this returns relative address */
592                 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
593                                                         false, !!tp->module);
594                 if (ret != 0)
595                         goto error;
596                 addr += tp->offset;
597         }
598 
599         pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
600                  tp->module ? : "kernel");
601 
602         dinfo = debuginfo_cache__open(tp->module, verbose == 0);
603         if (dinfo)
604                 ret = debuginfo__find_probe_point(dinfo,
605                                                  (unsigned long)addr, pp);
606         else
607                 ret = -ENOENT;
608 
609         if (ret > 0) {
610                 pp->retprobe = tp->retprobe;
611                 return 0;
612         }
613 error:
614         pr_debug("Failed to find corresponding probes from debuginfo.\n");
615         return ret ? : -ENOENT;
616 }
617 
618 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
619                                           int ntevs, const char *exec)
620 {
621         int i, ret = 0;
622         unsigned long stext = 0;
623 
624         if (!exec)
625                 return 0;
626 
627         ret = get_text_start_address(exec, &stext);
628         if (ret < 0)
629                 return ret;
630 
631         for (i = 0; i < ntevs && ret >= 0; i++) {
632                 /* point.address is the addres of point.symbol + point.offset */
633                 tevs[i].point.address -= stext;
634                 tevs[i].point.module = strdup(exec);
635                 if (!tevs[i].point.module) {
636                         ret = -ENOMEM;
637                         break;
638                 }
639                 tevs[i].uprobes = true;
640         }
641 
642         return ret;
643 }
644 
645 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
646                                             int ntevs, const char *module)
647 {
648         int i, ret = 0;
649         char *mod_name = NULL;
650 
651         if (!module)
652                 return 0;
653 
654         mod_name = find_module_name(module);
655 
656         for (i = 0; i < ntevs; i++) {
657                 tevs[i].point.module =
658                         strdup(mod_name ? mod_name : module);
659                 if (!tevs[i].point.module) {
660                         ret = -ENOMEM;
661                         break;
662                 }
663         }
664 
665         free(mod_name);
666         return ret;
667 }
668 
669 static int
670 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
671                                        int ntevs)
672 {
673         struct ref_reloc_sym *reloc_sym;
674         char *tmp;
675         int i, skipped = 0;
676 
677         reloc_sym = kernel_get_ref_reloc_sym();
678         if (!reloc_sym) {
679                 pr_warning("Relocated base symbol is not found!\n");
680                 return -EINVAL;
681         }
682 
683         for (i = 0; i < ntevs; i++) {
684                 if (!tevs[i].point.address || tevs[i].point.retprobe)
685                         continue;
686                 /* If we found a wrong one, mark it by NULL symbol */
687                 if (kprobe_warn_out_range(tevs[i].point.symbol,
688                                           tevs[i].point.address)) {
689                         tmp = NULL;
690                         skipped++;
691                 } else {
692                         tmp = strdup(reloc_sym->name);
693                         if (!tmp)
694                                 return -ENOMEM;
695                 }
696                 /* If we have no realname, use symbol for it */
697                 if (!tevs[i].point.realname)
698                         tevs[i].point.realname = tevs[i].point.symbol;
699                 else
700                         free(tevs[i].point.symbol);
701                 tevs[i].point.symbol = tmp;
702                 tevs[i].point.offset = tevs[i].point.address -
703                                        reloc_sym->unrelocated_addr;
704         }
705         return skipped;
706 }
707 
708 void __weak
709 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
710                                       int ntevs __maybe_unused)
711 {
712 }
713 
714 /* Post processing the probe events */
715 static int post_process_probe_trace_events(struct perf_probe_event *pev,
716                                            struct probe_trace_event *tevs,
717                                            int ntevs, const char *module,
718                                            bool uprobe)
719 {
720         int ret;
721 
722         if (uprobe)
723                 ret = add_exec_to_probe_trace_events(tevs, ntevs, module);
724         else if (module)
725                 /* Currently ref_reloc_sym based probe is not for drivers */
726                 ret = add_module_to_probe_trace_events(tevs, ntevs, module);
727         else
728                 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
729 
730         if (ret >= 0)
731                 arch__post_process_probe_trace_events(pev, ntevs);
732 
733         return ret;
734 }
735 
736 /* Try to find perf_probe_event with debuginfo */
737 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
738                                           struct probe_trace_event **tevs)
739 {
740         bool need_dwarf = perf_probe_event_need_dwarf(pev);
741         struct perf_probe_point tmp;
742         struct debuginfo *dinfo;
743         int ntevs, ret = 0;
744 
745         dinfo = open_debuginfo(pev->target, !need_dwarf);
746         if (!dinfo) {
747                 if (need_dwarf)
748                         return -ENOENT;
749                 pr_debug("Could not open debuginfo. Try to use symbols.\n");
750                 return 0;
751         }
752 
753         pr_debug("Try to find probe point from debuginfo.\n");
754         /* Searching trace events corresponding to a probe event */
755         ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
756 
757         if (ntevs == 0) {  /* Not found, retry with an alternative */
758                 ret = get_alternative_probe_event(dinfo, pev, &tmp);
759                 if (!ret) {
760                         ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
761                         /*
762                          * Write back to the original probe_event for
763                          * setting appropriate (user given) event name
764                          */
765                         clear_perf_probe_point(&pev->point);
766                         memcpy(&pev->point, &tmp, sizeof(tmp));
767                 }
768         }
769 
770         debuginfo__delete(dinfo);
771 
772         if (ntevs > 0) {        /* Succeeded to find trace events */
773                 pr_debug("Found %d probe_trace_events.\n", ntevs);
774                 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
775                                                 pev->target, pev->uprobes);
776                 if (ret < 0 || ret == ntevs) {
777                         clear_probe_trace_events(*tevs, ntevs);
778                         zfree(tevs);
779                 }
780                 if (ret != ntevs)
781                         return ret < 0 ? ret : ntevs;
782                 ntevs = 0;
783                 /* Fall through */
784         }
785 
786         if (ntevs == 0) {       /* No error but failed to find probe point. */
787                 pr_warning("Probe point '%s' not found.\n",
788                            synthesize_perf_probe_point(&pev->point));
789                 return -ENOENT;
790         }
791         /* Error path : ntevs < 0 */
792         pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
793         if (ntevs < 0) {
794                 if (ntevs == -EBADF)
795                         pr_warning("Warning: No dwarf info found in the vmlinux - "
796                                 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
797                 if (!need_dwarf) {
798                         pr_debug("Trying to use symbols.\n");
799                         return 0;
800                 }
801         }
802         return ntevs;
803 }
804 
805 #define LINEBUF_SIZE 256
806 #define NR_ADDITIONAL_LINES 2
807 
808 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
809 {
810         char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
811         const char *color = show_num ? "" : PERF_COLOR_BLUE;
812         const char *prefix = NULL;
813 
814         do {
815                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
816                         goto error;
817                 if (skip)
818                         continue;
819                 if (!prefix) {
820                         prefix = show_num ? "%7d  " : "         ";
821                         color_fprintf(stdout, color, prefix, l);
822                 }
823                 color_fprintf(stdout, color, "%s", buf);
824 
825         } while (strchr(buf, '\n') == NULL);
826 
827         return 1;
828 error:
829         if (ferror(fp)) {
830                 pr_warning("File read error: %s\n",
831                            str_error_r(errno, sbuf, sizeof(sbuf)));
832                 return -1;
833         }
834         return 0;
835 }
836 
837 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
838 {
839         int rv = __show_one_line(fp, l, skip, show_num);
840         if (rv == 0) {
841                 pr_warning("Source file is shorter than expected.\n");
842                 rv = -1;
843         }
844         return rv;
845 }
846 
847 #define show_one_line_with_num(f,l)     _show_one_line(f,l,false,true)
848 #define show_one_line(f,l)              _show_one_line(f,l,false,false)
849 #define skip_one_line(f,l)              _show_one_line(f,l,true,false)
850 #define show_one_line_or_eof(f,l)       __show_one_line(f,l,false,false)
851 
852 /*
853  * Show line-range always requires debuginfo to find source file and
854  * line number.
855  */
856 static int __show_line_range(struct line_range *lr, const char *module,
857                              bool user)
858 {
859         int l = 1;
860         struct int_node *ln;
861         struct debuginfo *dinfo;
862         FILE *fp;
863         int ret;
864         char *tmp;
865         char sbuf[STRERR_BUFSIZE];
866 
867         /* Search a line range */
868         dinfo = open_debuginfo(module, false);
869         if (!dinfo)
870                 return -ENOENT;
871 
872         ret = debuginfo__find_line_range(dinfo, lr);
873         if (!ret) {     /* Not found, retry with an alternative */
874                 ret = get_alternative_line_range(dinfo, lr, module, user);
875                 if (!ret)
876                         ret = debuginfo__find_line_range(dinfo, lr);
877         }
878         debuginfo__delete(dinfo);
879         if (ret == 0 || ret == -ENOENT) {
880                 pr_warning("Specified source line is not found.\n");
881                 return -ENOENT;
882         } else if (ret < 0) {
883                 pr_warning("Debuginfo analysis failed.\n");
884                 return ret;
885         }
886 
887         /* Convert source file path */
888         tmp = lr->path;
889         ret = get_real_path(tmp, lr->comp_dir, &lr->path);
890 
891         /* Free old path when new path is assigned */
892         if (tmp != lr->path)
893                 free(tmp);
894 
895         if (ret < 0) {
896                 pr_warning("Failed to find source file path.\n");
897                 return ret;
898         }
899 
900         setup_pager();
901 
902         if (lr->function)
903                 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
904                         lr->start - lr->offset);
905         else
906                 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
907 
908         fp = fopen(lr->path, "r");
909         if (fp == NULL) {
910                 pr_warning("Failed to open %s: %s\n", lr->path,
911                            str_error_r(errno, sbuf, sizeof(sbuf)));
912                 return -errno;
913         }
914         /* Skip to starting line number */
915         while (l < lr->start) {
916                 ret = skip_one_line(fp, l++);
917                 if (ret < 0)
918                         goto end;
919         }
920 
921         intlist__for_each_entry(ln, lr->line_list) {
922                 for (; ln->i > l; l++) {
923                         ret = show_one_line(fp, l - lr->offset);
924                         if (ret < 0)
925                                 goto end;
926                 }
927                 ret = show_one_line_with_num(fp, l++ - lr->offset);
928                 if (ret < 0)
929                         goto end;
930         }
931 
932         if (lr->end == INT_MAX)
933                 lr->end = l + NR_ADDITIONAL_LINES;
934         while (l <= lr->end) {
935                 ret = show_one_line_or_eof(fp, l++ - lr->offset);
936                 if (ret <= 0)
937                         break;
938         }
939 end:
940         fclose(fp);
941         return ret;
942 }
943 
944 int show_line_range(struct line_range *lr, const char *module, bool user)
945 {
946         int ret;
947 
948         ret = init_probe_symbol_maps(user);
949         if (ret < 0)
950                 return ret;
951         ret = __show_line_range(lr, module, user);
952         exit_probe_symbol_maps();
953 
954         return ret;
955 }
956 
957 static int show_available_vars_at(struct debuginfo *dinfo,
958                                   struct perf_probe_event *pev,
959                                   struct strfilter *_filter)
960 {
961         char *buf;
962         int ret, i, nvars;
963         struct str_node *node;
964         struct variable_list *vls = NULL, *vl;
965         struct perf_probe_point tmp;
966         const char *var;
967 
968         buf = synthesize_perf_probe_point(&pev->point);
969         if (!buf)
970                 return -EINVAL;
971         pr_debug("Searching variables at %s\n", buf);
972 
973         ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
974         if (!ret) {  /* Not found, retry with an alternative */
975                 ret = get_alternative_probe_event(dinfo, pev, &tmp);
976                 if (!ret) {
977                         ret = debuginfo__find_available_vars_at(dinfo, pev,
978                                                                 &vls);
979                         /* Release the old probe_point */
980                         clear_perf_probe_point(&tmp);
981                 }
982         }
983         if (ret <= 0) {
984                 if (ret == 0 || ret == -ENOENT) {
985                         pr_err("Failed to find the address of %s\n", buf);
986                         ret = -ENOENT;
987                 } else
988                         pr_warning("Debuginfo analysis failed.\n");
989                 goto end;
990         }
991 
992         /* Some variables are found */
993         fprintf(stdout, "Available variables at %s\n", buf);
994         for (i = 0; i < ret; i++) {
995                 vl = &vls[i];
996                 /*
997                  * A probe point might be converted to
998                  * several trace points.
999                  */
1000                 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1001                         vl->point.offset);
1002                 zfree(&vl->point.symbol);
1003                 nvars = 0;
1004                 if (vl->vars) {
1005                         strlist__for_each_entry(node, vl->vars) {
1006                                 var = strchr(node->s, '\t') + 1;
1007                                 if (strfilter__compare(_filter, var)) {
1008                                         fprintf(stdout, "\t\t%s\n", node->s);
1009                                         nvars++;
1010                                 }
1011                         }
1012                         strlist__delete(vl->vars);
1013                 }
1014                 if (nvars == 0)
1015                         fprintf(stdout, "\t\t(No matched variables)\n");
1016         }
1017         free(vls);
1018 end:
1019         free(buf);
1020         return ret;
1021 }
1022 
1023 /* Show available variables on given probe point */
1024 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1025                         struct strfilter *_filter)
1026 {
1027         int i, ret = 0;
1028         struct debuginfo *dinfo;
1029 
1030         ret = init_probe_symbol_maps(pevs->uprobes);
1031         if (ret < 0)
1032                 return ret;
1033 
1034         dinfo = open_debuginfo(pevs->target, false);
1035         if (!dinfo) {
1036                 ret = -ENOENT;
1037                 goto out;
1038         }
1039 
1040         setup_pager();
1041 
1042         for (i = 0; i < npevs && ret >= 0; i++)
1043                 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1044 
1045         debuginfo__delete(dinfo);
1046 out:
1047         exit_probe_symbol_maps();
1048         return ret;
1049 }
1050 
1051 #else   /* !HAVE_DWARF_SUPPORT */
1052 
1053 static void debuginfo_cache__exit(void)
1054 {
1055 }
1056 
1057 static int
1058 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1059                                  struct perf_probe_point *pp __maybe_unused,
1060                                  bool is_kprobe __maybe_unused)
1061 {
1062         return -ENOSYS;
1063 }
1064 
1065 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1066                                 struct probe_trace_event **tevs __maybe_unused)
1067 {
1068         if (perf_probe_event_need_dwarf(pev)) {
1069                 pr_warning("Debuginfo-analysis is not supported.\n");
1070                 return -ENOSYS;
1071         }
1072 
1073         return 0;
1074 }
1075 
1076 int show_line_range(struct line_range *lr __maybe_unused,
1077                     const char *module __maybe_unused,
1078                     bool user __maybe_unused)
1079 {
1080         pr_warning("Debuginfo-analysis is not supported.\n");
1081         return -ENOSYS;
1082 }
1083 
1084 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1085                         int npevs __maybe_unused,
1086                         struct strfilter *filter __maybe_unused)
1087 {
1088         pr_warning("Debuginfo-analysis is not supported.\n");
1089         return -ENOSYS;
1090 }
1091 #endif
1092 
1093 void line_range__clear(struct line_range *lr)
1094 {
1095         free(lr->function);
1096         free(lr->file);
1097         free(lr->path);
1098         free(lr->comp_dir);
1099         intlist__delete(lr->line_list);
1100         memset(lr, 0, sizeof(*lr));
1101 }
1102 
1103 int line_range__init(struct line_range *lr)
1104 {
1105         memset(lr, 0, sizeof(*lr));
1106         lr->line_list = intlist__new(NULL);
1107         if (!lr->line_list)
1108                 return -ENOMEM;
1109         else
1110                 return 0;
1111 }
1112 
1113 static int parse_line_num(char **ptr, int *val, const char *what)
1114 {
1115         const char *start = *ptr;
1116 
1117         errno = 0;
1118         *val = strtol(*ptr, ptr, 0);
1119         if (errno || *ptr == start) {
1120                 semantic_error("'%s' is not a valid number.\n", what);
1121                 return -EINVAL;
1122         }
1123         return 0;
1124 }
1125 
1126 /* Check the name is good for event, group or function */
1127 static bool is_c_func_name(const char *name)
1128 {
1129         if (!isalpha(*name) && *name != '_')
1130                 return false;
1131         while (*++name != '\0') {
1132                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1133                         return false;
1134         }
1135         return true;
1136 }
1137 
1138 /*
1139  * Stuff 'lr' according to the line range described by 'arg'.
1140  * The line range syntax is described by:
1141  *
1142  *         SRC[:SLN[+NUM|-ELN]]
1143  *         FNC[@SRC][:SLN[+NUM|-ELN]]
1144  */
1145 int parse_line_range_desc(const char *arg, struct line_range *lr)
1146 {
1147         char *range, *file, *name = strdup(arg);
1148         int err;
1149 
1150         if (!name)
1151                 return -ENOMEM;
1152 
1153         lr->start = 0;
1154         lr->end = INT_MAX;
1155 
1156         range = strchr(name, ':');
1157         if (range) {
1158                 *range++ = '\0';
1159 
1160                 err = parse_line_num(&range, &lr->start, "start line");
1161                 if (err)
1162                         goto err;
1163 
1164                 if (*range == '+' || *range == '-') {
1165                         const char c = *range++;
1166 
1167                         err = parse_line_num(&range, &lr->end, "end line");
1168                         if (err)
1169                                 goto err;
1170 
1171                         if (c == '+') {
1172                                 lr->end += lr->start;
1173                                 /*
1174                                  * Adjust the number of lines here.
1175                                  * If the number of lines == 1, the
1176                                  * the end of line should be equal to
1177                                  * the start of line.
1178                                  */
1179                                 lr->end--;
1180                         }
1181                 }
1182 
1183                 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1184 
1185                 err = -EINVAL;
1186                 if (lr->start > lr->end) {
1187                         semantic_error("Start line must be smaller"
1188                                        " than end line.\n");
1189                         goto err;
1190                 }
1191                 if (*range != '\0') {
1192                         semantic_error("Tailing with invalid str '%s'.\n", range);
1193                         goto err;
1194                 }
1195         }
1196 
1197         file = strchr(name, '@');
1198         if (file) {
1199                 *file = '\0';
1200                 lr->file = strdup(++file);
1201                 if (lr->file == NULL) {
1202                         err = -ENOMEM;
1203                         goto err;
1204                 }
1205                 lr->function = name;
1206         } else if (strchr(name, '/') || strchr(name, '.'))
1207                 lr->file = name;
1208         else if (is_c_func_name(name))/* We reuse it for checking funcname */
1209                 lr->function = name;
1210         else {  /* Invalid name */
1211                 semantic_error("'%s' is not a valid function name.\n", name);
1212                 err = -EINVAL;
1213                 goto err;
1214         }
1215 
1216         return 0;
1217 err:
1218         free(name);
1219         return err;
1220 }
1221 
1222 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1223 {
1224         char *ptr;
1225 
1226         ptr = strchr(*arg, ':');
1227         if (ptr) {
1228                 *ptr = '\0';
1229                 if (!pev->sdt && !is_c_func_name(*arg))
1230                         goto ng_name;
1231                 pev->group = strdup(*arg);
1232                 if (!pev->group)
1233                         return -ENOMEM;
1234                 *arg = ptr + 1;
1235         } else
1236                 pev->group = NULL;
1237         if (!pev->sdt && !is_c_func_name(*arg)) {
1238 ng_name:
1239                 semantic_error("%s is bad for event name -it must "
1240                                "follow C symbol-naming rule.\n", *arg);
1241                 return -EINVAL;
1242         }
1243         pev->event = strdup(*arg);
1244         if (pev->event == NULL)
1245                 return -ENOMEM;
1246 
1247         return 0;
1248 }
1249 
1250 /* Parse probepoint definition. */
1251 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1252 {
1253         struct perf_probe_point *pp = &pev->point;
1254         char *ptr, *tmp;
1255         char c, nc = 0;
1256         bool file_spec = false;
1257         int ret;
1258 
1259         /*
1260          * <Syntax>
1261          * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1262          * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1263          * perf probe %[GRP:]SDT_EVENT
1264          */
1265         if (!arg)
1266                 return -EINVAL;
1267 
1268         /*
1269          * If the probe point starts with '%',
1270          * or starts with "sdt_" and has a ':' but no '=',
1271          * then it should be a SDT/cached probe point.
1272          */
1273         if (arg[0] == '%' ||
1274             (!strncmp(arg, "sdt_", 4) &&
1275              !!strchr(arg, ':') && !strchr(arg, '='))) {
1276                 pev->sdt = true;
1277                 if (arg[0] == '%')
1278                         arg++;
1279         }
1280 
1281         ptr = strpbrk(arg, ";=@+%");
1282         if (pev->sdt) {
1283                 if (ptr) {
1284                         if (*ptr != '@') {
1285                                 semantic_error("%s must be an SDT name.\n",
1286                                                arg);
1287                                 return -EINVAL;
1288                         }
1289                         /* This must be a target file name or build id */
1290                         tmp = build_id_cache__complement(ptr + 1);
1291                         if (tmp) {
1292                                 pev->target = build_id_cache__origname(tmp);
1293                                 free(tmp);
1294                         } else
1295                                 pev->target = strdup(ptr + 1);
1296                         if (!pev->target)
1297                                 return -ENOMEM;
1298                         *ptr = '\0';
1299                 }
1300                 ret = parse_perf_probe_event_name(&arg, pev);
1301                 if (ret == 0) {
1302                         if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1303                                 ret = -errno;
1304                 }
1305                 return ret;
1306         }
1307 
1308         if (ptr && *ptr == '=') {       /* Event name */
1309                 *ptr = '\0';
1310                 tmp = ptr + 1;
1311                 ret = parse_perf_probe_event_name(&arg, pev);
1312                 if (ret < 0)
1313                         return ret;
1314 
1315                 arg = tmp;
1316         }
1317 
1318         /*
1319          * Check arg is function or file name and copy it.
1320          *
1321          * We consider arg to be a file spec if and only if it satisfies
1322          * all of the below criteria::
1323          * - it does not include any of "+@%",
1324          * - it includes one of ":;", and
1325          * - it has a period '.' in the name.
1326          *
1327          * Otherwise, we consider arg to be a function specification.
1328          */
1329         if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
1330                 /* This is a file spec if it includes a '.' before ; or : */
1331                 if (memchr(arg, '.', ptr - arg))
1332                         file_spec = true;
1333         }
1334 
1335         ptr = strpbrk(arg, ";:+@%");
1336         if (ptr) {
1337                 nc = *ptr;
1338                 *ptr++ = '\0';
1339         }
1340 
1341         if (arg[0] == '\0')
1342                 tmp = NULL;
1343         else {
1344                 tmp = strdup(arg);
1345                 if (tmp == NULL)
1346                         return -ENOMEM;
1347         }
1348 
1349         if (file_spec)
1350                 pp->file = tmp;
1351         else {
1352                 pp->function = tmp;
1353 
1354                 /*
1355                  * Keep pp->function even if this is absolute address,
1356                  * so it can mark whether abs_address is valid.
1357                  * Which make 'perf probe lib.bin 0x0' possible.
1358                  *
1359                  * Note that checking length of tmp is not needed
1360                  * because when we access tmp[1] we know tmp[0] is '',
1361                  * so tmp[1] should always valid (but could be '\0').
1362                  */
1363                 if (tmp && !strncmp(tmp, "0x", 2)) {
1364                         pp->abs_address = strtoul(pp->function, &tmp, 0);
1365                         if (*tmp != '\0') {
1366                                 semantic_error("Invalid absolute address.\n");
1367                                 return -EINVAL;
1368                         }
1369                 }
1370         }
1371 
1372         /* Parse other options */
1373         while (ptr) {
1374                 arg = ptr;
1375                 c = nc;
1376                 if (c == ';') { /* Lazy pattern must be the last part */
1377                         pp->lazy_line = strdup(arg);
1378                         if (pp->lazy_line == NULL)
1379                                 return -ENOMEM;
1380                         break;
1381                 }
1382                 ptr = strpbrk(arg, ";:+@%");
1383                 if (ptr) {
1384                         nc = *ptr;
1385                         *ptr++ = '\0';
1386                 }
1387                 switch (c) {
1388                 case ':':       /* Line number */
1389                         pp->line = strtoul(arg, &tmp, 0);
1390                         if (*tmp != '\0') {
1391                                 semantic_error("There is non-digit char"
1392                                                " in line number.\n");
1393                                 return -EINVAL;
1394                         }
1395                         break;
1396                 case '+':       /* Byte offset from a symbol */
1397                         pp->offset = strtoul(arg, &tmp, 0);
1398                         if (*tmp != '\0') {
1399                                 semantic_error("There is non-digit character"
1400                                                 " in offset.\n");
1401                                 return -EINVAL;
1402                         }
1403                         break;
1404                 case '@':       /* File name */
1405                         if (pp->file) {
1406                                 semantic_error("SRC@SRC is not allowed.\n");
1407                                 return -EINVAL;
1408                         }
1409                         pp->file = strdup(arg);
1410                         if (pp->file == NULL)
1411                                 return -ENOMEM;
1412                         break;
1413                 case '%':       /* Probe places */
1414                         if (strcmp(arg, "return") == 0) {
1415                                 pp->retprobe = 1;
1416                         } else {        /* Others not supported yet */
1417                                 semantic_error("%%%s is not supported.\n", arg);
1418                                 return -ENOTSUP;
1419                         }
1420                         break;
1421                 default:        /* Buggy case */
1422                         pr_err("This program has a bug at %s:%d.\n",
1423                                 __FILE__, __LINE__);
1424                         return -ENOTSUP;
1425                         break;
1426                 }
1427         }
1428 
1429         /* Exclusion check */
1430         if (pp->lazy_line && pp->line) {
1431                 semantic_error("Lazy pattern can't be used with"
1432                                " line number.\n");
1433                 return -EINVAL;
1434         }
1435 
1436         if (pp->lazy_line && pp->offset) {
1437                 semantic_error("Lazy pattern can't be used with offset.\n");
1438                 return -EINVAL;
1439         }
1440 
1441         if (pp->line && pp->offset) {
1442                 semantic_error("Offset can't be used with line number.\n");
1443                 return -EINVAL;
1444         }
1445 
1446         if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1447                 semantic_error("File always requires line number or "
1448                                "lazy pattern.\n");
1449                 return -EINVAL;
1450         }
1451 
1452         if (pp->offset && !pp->function) {
1453                 semantic_error("Offset requires an entry function.\n");
1454                 return -EINVAL;
1455         }
1456 
1457         if (pp->retprobe && !pp->function) {
1458                 semantic_error("Return probe requires an entry function.\n");
1459                 return -EINVAL;
1460         }
1461 
1462         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1463                 semantic_error("Offset/Line/Lazy pattern can't be used with "
1464                                "return probe.\n");
1465                 return -EINVAL;
1466         }
1467 
1468         pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1469                  pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1470                  pp->lazy_line);
1471         return 0;
1472 }
1473 
1474 /* Parse perf-probe event argument */
1475 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1476 {
1477         char *tmp, *goodname;
1478         struct perf_probe_arg_field **fieldp;
1479 
1480         pr_debug("parsing arg: %s into ", str);
1481 
1482         tmp = strchr(str, '=');
1483         if (tmp) {
1484                 arg->name = strndup(str, tmp - str);
1485                 if (arg->name == NULL)
1486                         return -ENOMEM;
1487                 pr_debug("name:%s ", arg->name);
1488                 str = tmp + 1;
1489         }
1490 
1491         tmp = strchr(str, ':');
1492         if (tmp) {      /* Type setting */
1493                 *tmp = '\0';
1494                 arg->type = strdup(tmp + 1);
1495                 if (arg->type == NULL)
1496                         return -ENOMEM;
1497                 pr_debug("type:%s ", arg->type);
1498         }
1499 
1500         tmp = strpbrk(str, "-.[");
1501         if (!is_c_varname(str) || !tmp) {
1502                 /* A variable, register, symbol or special value */
1503                 arg->var = strdup(str);
1504                 if (arg->var == NULL)
1505                         return -ENOMEM;
1506                 pr_debug("%s\n", arg->var);
1507                 return 0;
1508         }
1509 
1510         /* Structure fields or array element */
1511         arg->var = strndup(str, tmp - str);
1512         if (arg->var == NULL)
1513                 return -ENOMEM;
1514         goodname = arg->var;
1515         pr_debug("%s, ", arg->var);
1516         fieldp = &arg->field;
1517 
1518         do {
1519                 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1520                 if (*fieldp == NULL)
1521                         return -ENOMEM;
1522                 if (*tmp == '[') {      /* Array */
1523                         str = tmp;
1524                         (*fieldp)->index = strtol(str + 1, &tmp, 0);
1525                         (*fieldp)->ref = true;
1526                         if (*tmp != ']' || tmp == str + 1) {
1527                                 semantic_error("Array index must be a"
1528                                                 " number.\n");
1529                                 return -EINVAL;
1530                         }
1531                         tmp++;
1532                         if (*tmp == '\0')
1533                                 tmp = NULL;
1534                 } else {                /* Structure */
1535                         if (*tmp == '.') {
1536                                 str = tmp + 1;
1537                                 (*fieldp)->ref = false;
1538                         } else if (tmp[1] == '>') {
1539                                 str = tmp + 2;
1540                                 (*fieldp)->ref = true;
1541                         } else {
1542                                 semantic_error("Argument parse error: %s\n",
1543                                                str);
1544                                 return -EINVAL;
1545                         }
1546                         tmp = strpbrk(str, "-.[");
1547                 }
1548                 if (tmp) {
1549                         (*fieldp)->name = strndup(str, tmp - str);
1550                         if ((*fieldp)->name == NULL)
1551                                 return -ENOMEM;
1552                         if (*str != '[')
1553                                 goodname = (*fieldp)->name;
1554                         pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1555                         fieldp = &(*fieldp)->next;
1556                 }
1557         } while (tmp);
1558         (*fieldp)->name = strdup(str);
1559         if ((*fieldp)->name == NULL)
1560                 return -ENOMEM;
1561         if (*str != '[')
1562                 goodname = (*fieldp)->name;
1563         pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1564 
1565         /* If no name is specified, set the last field name (not array index)*/
1566         if (!arg->name) {
1567                 arg->name = strdup(goodname);
1568                 if (arg->name == NULL)
1569                         return -ENOMEM;
1570         }
1571         return 0;
1572 }
1573 
1574 /* Parse perf-probe event command */
1575 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1576 {
1577         char **argv;
1578         int argc, i, ret = 0;
1579 
1580         argv = argv_split(cmd, &argc);
1581         if (!argv) {
1582                 pr_debug("Failed to split arguments.\n");
1583                 return -ENOMEM;
1584         }
1585         if (argc - 1 > MAX_PROBE_ARGS) {
1586                 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1587                 ret = -ERANGE;
1588                 goto out;
1589         }
1590         /* Parse probe point */
1591         ret = parse_perf_probe_point(argv[0], pev);
1592         if (ret < 0)
1593                 goto out;
1594 
1595         /* Copy arguments and ensure return probe has no C argument */
1596         pev->nargs = argc - 1;
1597         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1598         if (pev->args == NULL) {
1599                 ret = -ENOMEM;
1600                 goto out;
1601         }
1602         for (i = 0; i < pev->nargs && ret >= 0; i++) {
1603                 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1604                 if (ret >= 0 &&
1605                     is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1606                         semantic_error("You can't specify local variable for"
1607                                        " kretprobe.\n");
1608                         ret = -EINVAL;
1609                 }
1610         }
1611 out:
1612         argv_free(argv);
1613 
1614         return ret;
1615 }
1616 
1617 /* Return true if this perf_probe_event requires debuginfo */
1618 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1619 {
1620         int i;
1621 
1622         if (pev->point.file || pev->point.line || pev->point.lazy_line)
1623                 return true;
1624 
1625         for (i = 0; i < pev->nargs; i++)
1626                 if (is_c_varname(pev->args[i].var) ||
1627                     !strcmp(pev->args[i].var, "$params") ||
1628                     !strcmp(pev->args[i].var, "$vars"))
1629                         return true;
1630 
1631         return false;
1632 }
1633 
1634 /* Parse probe_events event into struct probe_point */
1635 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1636 {
1637         struct probe_trace_point *tp = &tev->point;
1638         char pr;
1639         char *p;
1640         char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1641         int ret, i, argc;
1642         char **argv;
1643 
1644         pr_debug("Parsing probe_events: %s\n", cmd);
1645         argv = argv_split(cmd, &argc);
1646         if (!argv) {
1647                 pr_debug("Failed to split arguments.\n");
1648                 return -ENOMEM;
1649         }
1650         if (argc < 2) {
1651                 semantic_error("Too few probe arguments.\n");
1652                 ret = -ERANGE;
1653                 goto out;
1654         }
1655 
1656         /* Scan event and group name. */
1657         argv0_str = strdup(argv[0]);
1658         if (argv0_str == NULL) {
1659                 ret = -ENOMEM;
1660                 goto out;
1661         }
1662         fmt1_str = strtok_r(argv0_str, ":", &fmt);
1663         fmt2_str = strtok_r(NULL, "/", &fmt);
1664         fmt3_str = strtok_r(NULL, " \t", &fmt);
1665         if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1666             || fmt3_str == NULL) {
1667                 semantic_error("Failed to parse event name: %s\n", argv[0]);
1668                 ret = -EINVAL;
1669                 goto out;
1670         }
1671         pr = fmt1_str[0];
1672         tev->group = strdup(fmt2_str);
1673         tev->event = strdup(fmt3_str);
1674         if (tev->group == NULL || tev->event == NULL) {
1675                 ret = -ENOMEM;
1676                 goto out;
1677         }
1678         pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1679 
1680         tp->retprobe = (pr == 'r');
1681 
1682         /* Scan module name(if there), function name and offset */
1683         p = strchr(argv[1], ':');
1684         if (p) {
1685                 tp->module = strndup(argv[1], p - argv[1]);
1686                 if (!tp->module) {
1687                         ret = -ENOMEM;
1688                         goto out;
1689                 }
1690                 tev->uprobes = (tp->module[0] == '/');
1691                 p++;
1692         } else
1693                 p = argv[1];
1694         fmt1_str = strtok_r(p, "+", &fmt);
1695         /* only the address started with 0x */
1696         if (fmt1_str[0] == '') {
1697                 /*
1698                  * Fix a special case:
1699                  * if address == 0, kernel reports something like:
1700                  * p:probe_libc/abs_0 /lib/libc-2.18.so:0x          (null) arg1=%ax
1701                  * Newer kernel may fix that, but we want to
1702                  * support old kernel also.
1703                  */
1704                 if (strcmp(fmt1_str, "0x") == 0) {
1705                         if (!argv[2] || strcmp(argv[2], "(null)")) {
1706                                 ret = -EINVAL;
1707                                 goto out;
1708                         }
1709                         tp->address = 0;
1710 
1711                         free(argv[2]);
1712                         for (i = 2; argv[i + 1] != NULL; i++)
1713                                 argv[i] = argv[i + 1];
1714 
1715                         argv[i] = NULL;
1716                         argc -= 1;
1717                 } else
1718                         tp->address = strtoul(fmt1_str, NULL, 0);
1719         } else {
1720                 /* Only the symbol-based probe has offset */
1721                 tp->symbol = strdup(fmt1_str);
1722                 if (tp->symbol == NULL) {
1723                         ret = -ENOMEM;
1724                         goto out;
1725                 }
1726                 fmt2_str = strtok_r(NULL, "", &fmt);
1727                 if (fmt2_str == NULL)
1728                         tp->offset = 0;
1729                 else
1730                         tp->offset = strtoul(fmt2_str, NULL, 10);
1731         }
1732 
1733         tev->nargs = argc - 2;
1734         tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1735         if (tev->args == NULL) {
1736                 ret = -ENOMEM;
1737                 goto out;
1738         }
1739         for (i = 0; i < tev->nargs; i++) {
1740                 p = strchr(argv[i + 2], '=');
1741                 if (p)  /* We don't need which register is assigned. */
1742                         *p++ = '\0';
1743                 else
1744                         p = argv[i + 2];
1745                 tev->args[i].name = strdup(argv[i + 2]);
1746                 /* TODO: parse regs and offset */
1747                 tev->args[i].value = strdup(p);
1748                 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1749                         ret = -ENOMEM;
1750                         goto out;
1751                 }
1752         }
1753         ret = 0;
1754 out:
1755         free(argv0_str);
1756         argv_free(argv);
1757         return ret;
1758 }
1759 
1760 /* Compose only probe arg */
1761 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1762 {
1763         struct perf_probe_arg_field *field = pa->field;
1764         struct strbuf buf;
1765         char *ret = NULL;
1766         int err;
1767 
1768         if (strbuf_init(&buf, 64) < 0)
1769                 return NULL;
1770 
1771         if (pa->name && pa->var)
1772                 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1773         else
1774                 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1775         if (err)
1776                 goto out;
1777 
1778         while (field) {
1779                 if (field->name[0] == '[')
1780                         err = strbuf_addstr(&buf, field->name);
1781                 else
1782                         err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1783                                           field->name);
1784                 field = field->next;
1785                 if (err)
1786                         goto out;
1787         }
1788 
1789         if (pa->type)
1790                 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1791                         goto out;
1792 
1793         ret = strbuf_detach(&buf, NULL);
1794 out:
1795         strbuf_release(&buf);
1796         return ret;
1797 }
1798 
1799 /* Compose only probe point (not argument) */
1800 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1801 {
1802         struct strbuf buf;
1803         char *tmp, *ret = NULL;
1804         int len, err = 0;
1805 
1806         if (strbuf_init(&buf, 64) < 0)
1807                 return NULL;
1808 
1809         if (pp->function) {
1810                 if (strbuf_addstr(&buf, pp->function) < 0)
1811                         goto out;
1812                 if (pp->offset)
1813                         err = strbuf_addf(&buf, "+%lu", pp->offset);
1814                 else if (pp->line)
1815                         err = strbuf_addf(&buf, ":%d", pp->line);
1816                 else if (pp->retprobe)
1817                         err = strbuf_addstr(&buf, "%return");
1818                 if (err)
1819                         goto out;
1820         }
1821         if (pp->file) {
1822                 tmp = pp->file;
1823                 len = strlen(tmp);
1824                 if (len > 30) {
1825                         tmp = strchr(pp->file + len - 30, '/');
1826                         tmp = tmp ? tmp + 1 : pp->file + len - 30;
1827                 }
1828                 err = strbuf_addf(&buf, "@%s", tmp);
1829                 if (!err && !pp->function && pp->line)
1830                         err = strbuf_addf(&buf, ":%d", pp->line);
1831         }
1832         if (!err)
1833                 ret = strbuf_detach(&buf, NULL);
1834 out:
1835         strbuf_release(&buf);
1836         return ret;
1837 }
1838 
1839 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1840 {
1841         struct strbuf buf;
1842         char *tmp, *ret = NULL;
1843         int i;
1844 
1845         if (strbuf_init(&buf, 64))
1846                 return NULL;
1847         if (pev->event)
1848                 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1849                                 pev->event) < 0)
1850                         goto out;
1851 
1852         tmp = synthesize_perf_probe_point(&pev->point);
1853         if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1854                 goto out;
1855         free(tmp);
1856 
1857         for (i = 0; i < pev->nargs; i++) {
1858                 tmp = synthesize_perf_probe_arg(pev->args + i);
1859                 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1860                         goto out;
1861                 free(tmp);
1862         }
1863 
1864         ret = strbuf_detach(&buf, NULL);
1865 out:
1866         strbuf_release(&buf);
1867         return ret;
1868 }
1869 
1870 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1871                                             struct strbuf *buf, int depth)
1872 {
1873         int err;
1874         if (ref->next) {
1875                 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1876                                                          depth + 1);
1877                 if (depth < 0)
1878                         return depth;
1879         }
1880         err = strbuf_addf(buf, "%+ld(", ref->offset);
1881         return (err < 0) ? err : depth;
1882 }
1883 
1884 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1885                                       struct strbuf *buf)
1886 {
1887         struct probe_trace_arg_ref *ref = arg->ref;
1888         int depth = 0, err;
1889 
1890         /* Argument name or separator */
1891         if (arg->name)
1892                 err = strbuf_addf(buf, " %s=", arg->name);
1893         else
1894                 err = strbuf_addch(buf, ' ');
1895         if (err)
1896                 return err;
1897 
1898         /* Special case: @XXX */
1899         if (arg->value[0] == '@' && arg->ref)
1900                         ref = ref->next;
1901 
1902         /* Dereferencing arguments */
1903         if (ref) {
1904                 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1905                 if (depth < 0)
1906                         return depth;
1907         }
1908 
1909         /* Print argument value */
1910         if (arg->value[0] == '@' && arg->ref)
1911                 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
1912         else
1913                 err = strbuf_addstr(buf, arg->value);
1914 
1915         /* Closing */
1916         while (!err && depth--)
1917                 err = strbuf_addch(buf, ')');
1918 
1919         /* Print argument type */
1920         if (!err && arg->type)
1921                 err = strbuf_addf(buf, ":%s", arg->type);
1922 
1923         return err;
1924 }
1925 
1926 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1927 {
1928         struct probe_trace_point *tp = &tev->point;
1929         struct strbuf buf;
1930         char *ret = NULL;
1931         int i, err;
1932 
1933         /* Uprobes must have tp->module */
1934         if (tev->uprobes && !tp->module)
1935                 return NULL;
1936 
1937         if (strbuf_init(&buf, 32) < 0)
1938                 return NULL;
1939 
1940         if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
1941                         tev->group, tev->event) < 0)
1942                 goto error;
1943         /*
1944          * If tp->address == 0, then this point must be a
1945          * absolute address uprobe.
1946          * try_to_find_absolute_address() should have made
1947          * tp->symbol to "0x0".
1948          */
1949         if (tev->uprobes && !tp->address) {
1950                 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
1951                         goto error;
1952         }
1953 
1954         /* Use the tp->address for uprobes */
1955         if (tev->uprobes)
1956                 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
1957         else if (!strncmp(tp->symbol, "0x", 2))
1958                 /* Absolute address. See try_to_find_absolute_address() */
1959                 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
1960                                   tp->module ? ":" : "", tp->address);
1961         else
1962                 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
1963                                 tp->module ? ":" : "", tp->symbol, tp->offset);
1964         if (err)
1965                 goto error;
1966 
1967         for (i = 0; i < tev->nargs; i++)
1968                 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
1969                         goto error;
1970 
1971         ret = strbuf_detach(&buf, NULL);
1972 error:
1973         strbuf_release(&buf);
1974         return ret;
1975 }
1976 
1977 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
1978                                           struct perf_probe_point *pp,
1979                                           bool is_kprobe)
1980 {
1981         struct symbol *sym = NULL;
1982         struct map *map;
1983         u64 addr = tp->address;
1984         int ret = -ENOENT;
1985 
1986         if (!is_kprobe) {
1987                 map = dso__new_map(tp->module);
1988                 if (!map)
1989                         goto out;
1990                 sym = map__find_symbol(map, addr, NULL);
1991         } else {
1992                 if (tp->symbol && !addr) {
1993                         if (kernel_get_symbol_address_by_name(tp->symbol,
1994                                                 &addr, true, false) < 0)
1995                                 goto out;
1996                 }
1997                 if (addr) {
1998                         addr += tp->offset;
1999                         sym = __find_kernel_function(addr, &map);
2000                 }
2001         }
2002 
2003         if (!sym)
2004                 goto out;
2005 
2006         pp->retprobe = tp->retprobe;
2007         pp->offset = addr - map->unmap_ip(map, sym->start);
2008         pp->function = strdup(sym->name);
2009         ret = pp->function ? 0 : -ENOMEM;
2010 
2011 out:
2012         if (map && !is_kprobe) {
2013                 map__put(map);
2014         }
2015 
2016         return ret;
2017 }
2018 
2019 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2020                                        struct perf_probe_point *pp,
2021                                        bool is_kprobe)
2022 {
2023         char buf[128];
2024         int ret;
2025 
2026         ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2027         if (!ret)
2028                 return 0;
2029         ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2030         if (!ret)
2031                 return 0;
2032 
2033         pr_debug("Failed to find probe point from both of dwarf and map.\n");
2034 
2035         if (tp->symbol) {
2036                 pp->function = strdup(tp->symbol);
2037                 pp->offset = tp->offset;
2038         } else {
2039                 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2040                 if (ret < 0)
2041                         return ret;
2042                 pp->function = strdup(buf);
2043                 pp->offset = 0;
2044         }
2045         if (pp->function == NULL)
2046                 return -ENOMEM;
2047 
2048         pp->retprobe = tp->retprobe;
2049 
2050         return 0;
2051 }
2052 
2053 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2054                                struct perf_probe_event *pev, bool is_kprobe)
2055 {
2056         struct strbuf buf = STRBUF_INIT;
2057         int i, ret;
2058 
2059         /* Convert event/group name */
2060         pev->event = strdup(tev->event);
2061         pev->group = strdup(tev->group);
2062         if (pev->event == NULL || pev->group == NULL)
2063                 return -ENOMEM;
2064 
2065         /* Convert trace_point to probe_point */
2066         ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2067         if (ret < 0)
2068                 return ret;
2069 
2070         /* Convert trace_arg to probe_arg */
2071         pev->nargs = tev->nargs;
2072         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2073         if (pev->args == NULL)
2074                 return -ENOMEM;
2075         for (i = 0; i < tev->nargs && ret >= 0; i++) {
2076                 if (tev->args[i].name)
2077                         pev->args[i].name = strdup(tev->args[i].name);
2078                 else {
2079                         if ((ret = strbuf_init(&buf, 32)) < 0)
2080                                 goto error;
2081                         ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2082                         pev->args[i].name = strbuf_detach(&buf, NULL);
2083                 }
2084                 if (pev->args[i].name == NULL && ret >= 0)
2085                         ret = -ENOMEM;
2086         }
2087 error:
2088         if (ret < 0)
2089                 clear_perf_probe_event(pev);
2090 
2091         return ret;
2092 }
2093 
2094 void clear_perf_probe_event(struct perf_probe_event *pev)
2095 {
2096         struct perf_probe_arg_field *field, *next;
2097         int i;
2098 
2099         free(pev->event);
2100         free(pev->group);
2101         free(pev->target);
2102         clear_perf_probe_point(&pev->point);
2103 
2104         for (i = 0; i < pev->nargs; i++) {
2105                 free(pev->args[i].name);
2106                 free(pev->args[i].var);
2107                 free(pev->args[i].type);
2108                 field = pev->args[i].field;
2109                 while (field) {
2110                         next = field->next;
2111                         zfree(&field->name);
2112                         free(field);
2113                         field = next;
2114                 }
2115         }
2116         free(pev->args);
2117         memset(pev, 0, sizeof(*pev));
2118 }
2119 
2120 #define strdup_or_goto(str, label)      \
2121 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2122 
2123 static int perf_probe_point__copy(struct perf_probe_point *dst,
2124                                   struct perf_probe_point *src)
2125 {
2126         dst->file = strdup_or_goto(src->file, out_err);
2127         dst->function = strdup_or_goto(src->function, out_err);
2128         dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2129         dst->line = src->line;
2130         dst->retprobe = src->retprobe;
2131         dst->offset = src->offset;
2132         return 0;
2133 
2134 out_err:
2135         clear_perf_probe_point(dst);
2136         return -ENOMEM;
2137 }
2138 
2139 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2140                                 struct perf_probe_arg *src)
2141 {
2142         struct perf_probe_arg_field *field, **ppfield;
2143 
2144         dst->name = strdup_or_goto(src->name, out_err);
2145         dst->var = strdup_or_goto(src->var, out_err);
2146         dst->type = strdup_or_goto(src->type, out_err);
2147 
2148         field = src->field;
2149         ppfield = &(dst->field);
2150         while (field) {
2151                 *ppfield = zalloc(sizeof(*field));
2152                 if (!*ppfield)
2153                         goto out_err;
2154                 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2155                 (*ppfield)->index = field->index;
2156                 (*ppfield)->ref = field->ref;
2157                 field = field->next;
2158                 ppfield = &((*ppfield)->next);
2159         }
2160         return 0;
2161 out_err:
2162         return -ENOMEM;
2163 }
2164 
2165 int perf_probe_event__copy(struct perf_probe_event *dst,
2166                            struct perf_probe_event *src)
2167 {
2168         int i;
2169 
2170         dst->event = strdup_or_goto(src->event, out_err);
2171         dst->group = strdup_or_goto(src->group, out_err);
2172         dst->target = strdup_or_goto(src->target, out_err);
2173         dst->uprobes = src->uprobes;
2174 
2175         if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2176                 goto out_err;
2177 
2178         dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2179         if (!dst->args)
2180                 goto out_err;
2181         dst->nargs = src->nargs;
2182 
2183         for (i = 0; i < src->nargs; i++)
2184                 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2185                         goto out_err;
2186         return 0;
2187 
2188 out_err:
2189         clear_perf_probe_event(dst);
2190         return -ENOMEM;
2191 }
2192 
2193 void clear_probe_trace_event(struct probe_trace_event *tev)
2194 {
2195         struct probe_trace_arg_ref *ref, *next;
2196         int i;
2197 
2198         free(tev->event);
2199         free(tev->group);
2200         free(tev->point.symbol);
2201         free(tev->point.realname);
2202         free(tev->point.module);
2203         for (i = 0; i < tev->nargs; i++) {
2204                 free(tev->args[i].name);
2205                 free(tev->args[i].value);
2206                 free(tev->args[i].type);
2207                 ref = tev->args[i].ref;
2208                 while (ref) {
2209                         next = ref->next;
2210                         free(ref);
2211                         ref = next;
2212                 }
2213         }
2214         free(tev->args);
2215         memset(tev, 0, sizeof(*tev));
2216 }
2217 
2218 struct kprobe_blacklist_node {
2219         struct list_head list;
2220         unsigned long start;
2221         unsigned long end;
2222         char *symbol;
2223 };
2224 
2225 static void kprobe_blacklist__delete(struct list_head *blacklist)
2226 {
2227         struct kprobe_blacklist_node *node;
2228 
2229         while (!list_empty(blacklist)) {
2230                 node = list_first_entry(blacklist,
2231                                         struct kprobe_blacklist_node, list);
2232                 list_del(&node->list);
2233                 free(node->symbol);
2234                 free(node);
2235         }
2236 }
2237 
2238 static int kprobe_blacklist__load(struct list_head *blacklist)
2239 {
2240         struct kprobe_blacklist_node *node;
2241         const char *__debugfs = debugfs__mountpoint();
2242         char buf[PATH_MAX], *p;
2243         FILE *fp;
2244         int ret;
2245 
2246         if (__debugfs == NULL)
2247                 return -ENOTSUP;
2248 
2249         ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2250         if (ret < 0)
2251                 return ret;
2252 
2253         fp = fopen(buf, "r");
2254         if (!fp)
2255                 return -errno;
2256 
2257         ret = 0;
2258         while (fgets(buf, PATH_MAX, fp)) {
2259                 node = zalloc(sizeof(*node));
2260                 if (!node) {
2261                         ret = -ENOMEM;
2262                         break;
2263                 }
2264                 INIT_LIST_HEAD(&node->list);
2265                 list_add_tail(&node->list, blacklist);
2266                 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2267                         ret = -EINVAL;
2268                         break;
2269                 }
2270                 p = strchr(buf, '\t');
2271                 if (p) {
2272                         p++;
2273                         if (p[strlen(p) - 1] == '\n')
2274                                 p[strlen(p) - 1] = '\0';
2275                 } else
2276                         p = (char *)"unknown";
2277                 node->symbol = strdup(p);
2278                 if (!node->symbol) {
2279                         ret = -ENOMEM;
2280                         break;
2281                 }
2282                 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2283                           node->start, node->end, node->symbol);
2284                 ret++;
2285         }
2286         if (ret < 0)
2287                 kprobe_blacklist__delete(blacklist);
2288         fclose(fp);
2289 
2290         return ret;
2291 }
2292 
2293 static struct kprobe_blacklist_node *
2294 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2295                                   unsigned long address)
2296 {
2297         struct kprobe_blacklist_node *node;
2298 
2299         list_for_each_entry(node, blacklist, list) {
2300                 if (node->start <= address && address <= node->end)
2301                         return node;
2302         }
2303 
2304         return NULL;
2305 }
2306 
2307 static LIST_HEAD(kprobe_blacklist);
2308 
2309 static void kprobe_blacklist__init(void)
2310 {
2311         if (!list_empty(&kprobe_blacklist))
2312                 return;
2313 
2314         if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2315                 pr_debug("No kprobe blacklist support, ignored\n");
2316 }
2317 
2318 static void kprobe_blacklist__release(void)
2319 {
2320         kprobe_blacklist__delete(&kprobe_blacklist);
2321 }
2322 
2323 static bool kprobe_blacklist__listed(unsigned long address)
2324 {
2325         return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2326 }
2327 
2328 static int perf_probe_event__sprintf(const char *group, const char *event,
2329                                      struct perf_probe_event *pev,
2330                                      const char *module,
2331                                      struct strbuf *result)
2332 {
2333         int i, ret;
2334         char *buf;
2335 
2336         if (asprintf(&buf, "%s:%s", group, event) < 0)
2337                 return -errno;
2338         ret = strbuf_addf(result, "  %-20s (on ", buf);
2339         free(buf);
2340         if (ret)
2341                 return ret;
2342 
2343         /* Synthesize only event probe point */
2344         buf = synthesize_perf_probe_point(&pev->point);
2345         if (!buf)
2346                 return -ENOMEM;
2347         ret = strbuf_addstr(result, buf);
2348         free(buf);
2349 
2350         if (!ret && module)
2351                 ret = strbuf_addf(result, " in %s", module);
2352 
2353         if (!ret && pev->nargs > 0) {
2354                 ret = strbuf_add(result, " with", 5);
2355                 for (i = 0; !ret && i < pev->nargs; i++) {
2356                         buf = synthesize_perf_probe_arg(&pev->args[i]);
2357                         if (!buf)
2358                                 return -ENOMEM;
2359                         ret = strbuf_addf(result, " %s", buf);
2360                         free(buf);
2361                 }
2362         }
2363         if (!ret)
2364                 ret = strbuf_addch(result, ')');
2365 
2366         return ret;
2367 }
2368 
2369 /* Show an event */
2370 int show_perf_probe_event(const char *group, const char *event,
2371                           struct perf_probe_event *pev,
2372                           const char *module, bool use_stdout)
2373 {
2374         struct strbuf buf = STRBUF_INIT;
2375         int ret;
2376 
2377         ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2378         if (ret >= 0) {
2379                 if (use_stdout)
2380                         printf("%s\n", buf.buf);
2381                 else
2382                         pr_info("%s\n", buf.buf);
2383         }
2384         strbuf_release(&buf);
2385 
2386         return ret;
2387 }
2388 
2389 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2390                                      struct strfilter *filter)
2391 {
2392         char tmp[128];
2393 
2394         /* At first, check the event name itself */
2395         if (strfilter__compare(filter, tev->event))
2396                 return true;
2397 
2398         /* Next, check the combination of name and group */
2399         if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2400                 return false;
2401         return strfilter__compare(filter, tmp);
2402 }
2403 
2404 static int __show_perf_probe_events(int fd, bool is_kprobe,
2405                                     struct strfilter *filter)
2406 {
2407         int ret = 0;
2408         struct probe_trace_event tev;
2409         struct perf_probe_event pev;
2410         struct strlist *rawlist;
2411         struct str_node *ent;
2412 
2413         memset(&tev, 0, sizeof(tev));
2414         memset(&pev, 0, sizeof(pev));
2415 
2416         rawlist = probe_file__get_rawlist(fd);
2417         if (!rawlist)
2418                 return -ENOMEM;
2419 
2420         strlist__for_each_entry(ent, rawlist) {
2421                 ret = parse_probe_trace_command(ent->s, &tev);
2422                 if (ret >= 0) {
2423                         if (!filter_probe_trace_event(&tev, filter))
2424                                 goto next;
2425                         ret = convert_to_perf_probe_event(&tev, &pev,
2426                                                                 is_kprobe);
2427                         if (ret < 0)
2428                                 goto next;
2429                         ret = show_perf_probe_event(pev.group, pev.event,
2430                                                     &pev, tev.point.module,
2431                                                     true);
2432                 }
2433 next:
2434                 clear_perf_probe_event(&pev);
2435                 clear_probe_trace_event(&tev);
2436                 if (ret < 0)
2437                         break;
2438         }
2439         strlist__delete(rawlist);
2440         /* Cleanup cached debuginfo if needed */
2441         debuginfo_cache__exit();
2442 
2443         return ret;
2444 }
2445 
2446 /* List up current perf-probe events */
2447 int show_perf_probe_events(struct strfilter *filter)
2448 {
2449         int kp_fd, up_fd, ret;
2450 
2451         setup_pager();
2452 
2453         if (probe_conf.cache)
2454                 return probe_cache__show_all_caches(filter);
2455 
2456         ret = init_probe_symbol_maps(false);
2457         if (ret < 0)
2458                 return ret;
2459 
2460         ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2461         if (ret < 0)
2462                 return ret;
2463 
2464         if (kp_fd >= 0)
2465                 ret = __show_perf_probe_events(kp_fd, true, filter);
2466         if (up_fd >= 0 && ret >= 0)
2467                 ret = __show_perf_probe_events(up_fd, false, filter);
2468         if (kp_fd > 0)
2469                 close(kp_fd);
2470         if (up_fd > 0)
2471                 close(up_fd);
2472         exit_probe_symbol_maps();
2473 
2474         return ret;
2475 }
2476 
2477 static int get_new_event_name(char *buf, size_t len, const char *base,
2478                               struct strlist *namelist, bool allow_suffix)
2479 {
2480         int i, ret;
2481         char *p, *nbase;
2482 
2483         if (*base == '.')
2484                 base++;
2485         nbase = strdup(base);
2486         if (!nbase)
2487                 return -ENOMEM;
2488 
2489         /* Cut off the dot suffixes (e.g. .const, .isra)*/
2490         p = strchr(nbase, '.');
2491         if (p && p != nbase)
2492                 *p = '\0';
2493 
2494         /* Try no suffix number */
2495         ret = e_snprintf(buf, len, "%s", nbase);
2496         if (ret < 0) {
2497                 pr_debug("snprintf() failed: %d\n", ret);
2498                 goto out;
2499         }
2500         if (!strlist__has_entry(namelist, buf))
2501                 goto out;
2502 
2503         if (!allow_suffix) {
2504                 pr_warning("Error: event \"%s\" already exists.\n"
2505                            " Hint: Remove existing event by 'perf probe -d'\n"
2506                            "       or force duplicates by 'perf probe -f'\n"
2507                            "       or set 'force=yes' in BPF source.\n",
2508                            buf);
2509                 ret = -EEXIST;
2510                 goto out;
2511         }
2512 
2513         /* Try to add suffix */
2514         for (i = 1; i < MAX_EVENT_INDEX; i++) {
2515                 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2516                 if (ret < 0) {
2517                         pr_debug("snprintf() failed: %d\n", ret);
2518                         goto out;
2519                 }
2520                 if (!strlist__has_entry(namelist, buf))
2521                         break;
2522         }
2523         if (i == MAX_EVENT_INDEX) {
2524                 pr_warning("Too many events are on the same function.\n");
2525                 ret = -ERANGE;
2526         }
2527 
2528 out:
2529         free(nbase);
2530         return ret;
2531 }
2532 
2533 /* Warn if the current kernel's uprobe implementation is old */
2534 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2535 {
2536         int i;
2537         char *buf = synthesize_probe_trace_command(tev);
2538 
2539         /* Old uprobe event doesn't support memory dereference */
2540         if (!tev->uprobes || tev->nargs == 0 || !buf)
2541                 goto out;
2542 
2543         for (i = 0; i < tev->nargs; i++)
2544                 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2545                         pr_warning("Please upgrade your kernel to at least "
2546                                    "3.14 to have access to feature %s\n",
2547                                    tev->args[i].value);
2548                         break;
2549                 }
2550 out:
2551         free(buf);
2552 }
2553 
2554 /* Set new name from original perf_probe_event and namelist */
2555 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2556                                        struct perf_probe_event *pev,
2557                                        struct strlist *namelist,
2558                                        bool allow_suffix)
2559 {
2560         const char *event, *group;
2561         char buf[64];
2562         int ret;
2563 
2564         /* If probe_event or trace_event already have the name, reuse it */
2565         if (pev->event && !pev->sdt)
2566                 event = pev->event;
2567         else if (tev->event)
2568                 event = tev->event;
2569         else {
2570                 /* Or generate new one from probe point */
2571                 if (pev->point.function &&
2572                         (strncmp(pev->point.function, "0x", 2) != 0) &&
2573                         !strisglob(pev->point.function))
2574                         event = pev->point.function;
2575                 else
2576                         event = tev->point.realname;
2577         }
2578         if (pev->group && !pev->sdt)
2579                 group = pev->group;
2580         else if (tev->group)
2581                 group = tev->group;
2582         else
2583                 group = PERFPROBE_GROUP;
2584 
2585         /* Get an unused new event name */
2586         ret = get_new_event_name(buf, 64, event,
2587                                  namelist, allow_suffix);
2588         if (ret < 0)
2589                 return ret;
2590 
2591         event = buf;
2592 
2593         tev->event = strdup(event);
2594         tev->group = strdup(group);
2595         if (tev->event == NULL || tev->group == NULL)
2596                 return -ENOMEM;
2597 
2598         /* Add added event name to namelist */
2599         strlist__add(namelist, event);
2600         return 0;
2601 }
2602 
2603 static int __open_probe_file_and_namelist(bool uprobe,
2604                                           struct strlist **namelist)
2605 {
2606         int fd;
2607 
2608         fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2609         if (fd < 0)
2610                 return fd;
2611 
2612         /* Get current event names */
2613         *namelist = probe_file__get_namelist(fd);
2614         if (!(*namelist)) {
2615                 pr_debug("Failed to get current event list.\n");
2616                 close(fd);
2617                 return -ENOMEM;
2618         }
2619         return fd;
2620 }
2621 
2622 static int __add_probe_trace_events(struct perf_probe_event *pev,
2623                                      struct probe_trace_event *tevs,
2624                                      int ntevs, bool allow_suffix)
2625 {
2626         int i, fd[2] = {-1, -1}, up, ret;
2627         struct probe_trace_event *tev = NULL;
2628         struct probe_cache *cache = NULL;
2629         struct strlist *namelist[2] = {NULL, NULL};
2630 
2631         up = pev->uprobes ? 1 : 0;
2632         fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2633         if (fd[up] < 0)
2634                 return fd[up];
2635 
2636         ret = 0;
2637         for (i = 0; i < ntevs; i++) {
2638                 tev = &tevs[i];
2639                 up = tev->uprobes ? 1 : 0;
2640                 if (fd[up] == -1) {     /* Open the kprobe/uprobe_events */
2641                         fd[up] = __open_probe_file_and_namelist(up,
2642                                                                 &namelist[up]);
2643                         if (fd[up] < 0)
2644                                 goto close_out;
2645                 }
2646                 /* Skip if the symbol is out of .text or blacklisted */
2647                 if (!tev->point.symbol && !pev->uprobes)
2648                         continue;
2649 
2650                 /* Set new name for tev (and update namelist) */
2651                 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2652                                                   allow_suffix);
2653                 if (ret < 0)
2654                         break;
2655 
2656                 ret = probe_file__add_event(fd[up], tev);
2657                 if (ret < 0)
2658                         break;
2659 
2660                 /*
2661                  * Probes after the first probe which comes from same
2662                  * user input are always allowed to add suffix, because
2663                  * there might be several addresses corresponding to
2664                  * one code line.
2665                  */
2666                 allow_suffix = true;
2667         }
2668         if (ret == -EINVAL && pev->uprobes)
2669                 warn_uprobe_event_compat(tev);
2670         if (ret == 0 && probe_conf.cache) {
2671                 cache = probe_cache__new(pev->target);
2672                 if (!cache ||
2673                     probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2674                     probe_cache__commit(cache) < 0)
2675                         pr_warning("Failed to add event to probe cache\n");
2676                 probe_cache__delete(cache);
2677         }
2678 
2679 close_out:
2680         for (up = 0; up < 2; up++) {
2681                 strlist__delete(namelist[up]);
2682                 if (fd[up] >= 0)
2683                         close(fd[up]);
2684         }
2685         return ret;
2686 }
2687 
2688 static int find_probe_functions(struct map *map, char *name,
2689                                 struct symbol **syms)
2690 {
2691         int found = 0;
2692         struct symbol *sym;
2693         struct rb_node *tmp;
2694 
2695         if (map__load(map, NULL) < 0)
2696                 return 0;
2697 
2698         map__for_each_symbol(map, sym, tmp) {
2699                 if (strglobmatch(sym->name, name)) {
2700                         found++;
2701                         if (syms && found < probe_conf.max_probes)
2702                                 syms[found - 1] = sym;
2703                 }
2704         }
2705 
2706         return found;
2707 }
2708 
2709 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2710                                 struct probe_trace_event *tev __maybe_unused,
2711                                 struct map *map __maybe_unused,
2712                                 struct symbol *sym __maybe_unused) { }
2713 
2714 /*
2715  * Find probe function addresses from map.
2716  * Return an error or the number of found probe_trace_event
2717  */
2718 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2719                                             struct probe_trace_event **tevs)
2720 {
2721         struct map *map = NULL;
2722         struct ref_reloc_sym *reloc_sym = NULL;
2723         struct symbol *sym;
2724         struct symbol **syms = NULL;
2725         struct probe_trace_event *tev;
2726         struct perf_probe_point *pp = &pev->point;
2727         struct probe_trace_point *tp;
2728         int num_matched_functions;
2729         int ret, i, j, skipped = 0;
2730         char *mod_name;
2731 
2732         map = get_target_map(pev->target, pev->uprobes);
2733         if (!map) {
2734                 ret = -EINVAL;
2735                 goto out;
2736         }
2737 
2738         syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2739         if (!syms) {
2740                 ret = -ENOMEM;
2741                 goto out;
2742         }
2743 
2744         /*
2745          * Load matched symbols: Since the different local symbols may have
2746          * same name but different addresses, this lists all the symbols.
2747          */
2748         num_matched_functions = find_probe_functions(map, pp->function, syms);
2749         if (num_matched_functions == 0) {
2750                 pr_err("Failed to find symbol %s in %s\n", pp->function,
2751                         pev->target ? : "kernel");
2752                 ret = -ENOENT;
2753                 goto out;
2754         } else if (num_matched_functions > probe_conf.max_probes) {
2755                 pr_err("Too many functions matched in %s\n",
2756                         pev->target ? : "kernel");
2757                 ret = -E2BIG;
2758                 goto out;
2759         }
2760 
2761         /* Note that the symbols in the kmodule are not relocated */
2762         if (!pev->uprobes && !pp->retprobe && !pev->target) {
2763                 reloc_sym = kernel_get_ref_reloc_sym();
2764                 if (!reloc_sym) {
2765                         pr_warning("Relocated base symbol is not found!\n");
2766                         ret = -EINVAL;
2767                         goto out;
2768                 }
2769         }
2770 
2771         /* Setup result trace-probe-events */
2772         *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2773         if (!*tevs) {
2774                 ret = -ENOMEM;
2775                 goto out;
2776         }
2777 
2778         ret = 0;
2779 
2780         for (j = 0; j < num_matched_functions; j++) {
2781                 sym = syms[j];
2782 
2783                 tev = (*tevs) + ret;
2784                 tp = &tev->point;
2785                 if (ret == num_matched_functions) {
2786                         pr_warning("Too many symbols are listed. Skip it.\n");
2787                         break;
2788                 }
2789                 ret++;
2790 
2791                 if (pp->offset > sym->end - sym->start) {
2792                         pr_warning("Offset %ld is bigger than the size of %s\n",
2793                                    pp->offset, sym->name);
2794                         ret = -ENOENT;
2795                         goto err_out;
2796                 }
2797                 /* Add one probe point */
2798                 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2799 
2800                 /* Check the kprobe (not in module) is within .text  */
2801                 if (!pev->uprobes && !pev->target &&
2802                     kprobe_warn_out_range(sym->name, tp->address)) {
2803                         tp->symbol = NULL;      /* Skip it */
2804                         skipped++;
2805                 } else if (reloc_sym) {
2806                         tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2807                         tp->offset = tp->address - reloc_sym->addr;
2808                 } else {
2809                         tp->symbol = strdup_or_goto(sym->name, nomem_out);
2810                         tp->offset = pp->offset;
2811                 }
2812                 tp->realname = strdup_or_goto(sym->name, nomem_out);
2813 
2814                 tp->retprobe = pp->retprobe;
2815                 if (pev->target) {
2816                         if (pev->uprobes) {
2817                                 tev->point.module = strdup_or_goto(pev->target,
2818                                                                    nomem_out);
2819                         } else {
2820                                 mod_name = find_module_name(pev->target);
2821                                 tev->point.module =
2822                                         strdup(mod_name ? mod_name : pev->target);
2823                                 free(mod_name);
2824                                 if (!tev->point.module)
2825                                         goto nomem_out;
2826                         }
2827                 }
2828                 tev->uprobes = pev->uprobes;
2829                 tev->nargs = pev->nargs;
2830                 if (tev->nargs) {
2831                         tev->args = zalloc(sizeof(struct probe_trace_arg) *
2832                                            tev->nargs);
2833                         if (tev->args == NULL)
2834                                 goto nomem_out;
2835                 }
2836                 for (i = 0; i < tev->nargs; i++) {
2837                         if (pev->args[i].name)
2838                                 tev->args[i].name =
2839                                         strdup_or_goto(pev->args[i].name,
2840                                                         nomem_out);
2841 
2842                         tev->args[i].value = strdup_or_goto(pev->args[i].var,
2843                                                             nomem_out);
2844                         if (pev->args[i].type)
2845                                 tev->args[i].type =
2846                                         strdup_or_goto(pev->args[i].type,
2847                                                         nomem_out);
2848                 }
2849                 arch__fix_tev_from_maps(pev, tev, map, sym);
2850         }
2851         if (ret == skipped) {
2852                 ret = -ENOENT;
2853                 goto err_out;
2854         }
2855 
2856 out:
2857         put_target_map(map, pev->uprobes);
2858         free(syms);
2859         return ret;
2860 
2861 nomem_out:
2862         ret = -ENOMEM;
2863 err_out:
2864         clear_probe_trace_events(*tevs, num_matched_functions);
2865         zfree(tevs);
2866         goto out;
2867 }
2868 
2869 static int try_to_find_absolute_address(struct perf_probe_event *pev,
2870                                         struct probe_trace_event **tevs)
2871 {
2872         struct perf_probe_point *pp = &pev->point;
2873         struct probe_trace_event *tev;
2874         struct probe_trace_point *tp;
2875         int i, err;
2876 
2877         if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
2878                 return -EINVAL;
2879         if (perf_probe_event_need_dwarf(pev))
2880                 return -EINVAL;
2881 
2882         /*
2883          * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
2884          * absolute address.
2885          *
2886          * Only one tev can be generated by this.
2887          */
2888         *tevs = zalloc(sizeof(*tev));
2889         if (!*tevs)
2890                 return -ENOMEM;
2891 
2892         tev = *tevs;
2893         tp = &tev->point;
2894 
2895         /*
2896          * Don't use tp->offset, use address directly, because
2897          * in synthesize_probe_trace_command() address cannot be
2898          * zero.
2899          */
2900         tp->address = pev->point.abs_address;
2901         tp->retprobe = pp->retprobe;
2902         tev->uprobes = pev->uprobes;
2903 
2904         err = -ENOMEM;
2905         /*
2906          * Give it a '0x' leading symbol name.
2907          * In __add_probe_trace_events, a NULL symbol is interpreted as
2908          * invalud.
2909          */
2910         if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
2911                 goto errout;
2912 
2913         /* For kprobe, check range */
2914         if ((!tev->uprobes) &&
2915             (kprobe_warn_out_range(tev->point.symbol,
2916                                    tev->point.address))) {
2917                 err = -EACCES;
2918                 goto errout;
2919         }
2920 
2921         if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
2922                 goto errout;
2923 
2924         if (pev->target) {
2925                 tp->module = strdup(pev->target);
2926                 if (!tp->module)
2927                         goto errout;
2928         }
2929 
2930         if (tev->group) {
2931                 tev->group = strdup(pev->group);
2932                 if (!tev->group)
2933                         goto errout;
2934         }
2935 
2936         if (pev->event) {
2937                 tev->event = strdup(pev->event);
2938                 if (!tev->event)
2939                         goto errout;
2940         }
2941 
2942         tev->nargs = pev->nargs;
2943         tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
2944         if (!tev->args) {
2945                 err = -ENOMEM;
2946                 goto errout;
2947         }
2948         for (i = 0; i < tev->nargs; i++)
2949                 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
2950 
2951         return 1;
2952 
2953 errout:
2954         if (*tevs) {
2955                 clear_probe_trace_events(*tevs, 1);
2956                 *tevs = NULL;
2957         }
2958         return err;
2959 }
2960 
2961 /* Concatinate two arrays */
2962 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
2963 {
2964         void *ret;
2965 
2966         ret = malloc(sz_a + sz_b);
2967         if (ret) {
2968                 memcpy(ret, a, sz_a);
2969                 memcpy(ret + sz_a, b, sz_b);
2970         }
2971         return ret;
2972 }
2973 
2974 static int
2975 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
2976                           struct probe_trace_event **tevs2, int ntevs2)
2977 {
2978         struct probe_trace_event *new_tevs;
2979         int ret = 0;
2980 
2981         if (ntevs == 0) {
2982                 *tevs = *tevs2;
2983                 *ntevs = ntevs2;
2984                 *tevs2 = NULL;
2985                 return 0;
2986         }
2987 
2988         if (*ntevs + ntevs2 > probe_conf.max_probes)
2989                 ret = -E2BIG;
2990         else {
2991                 /* Concatinate the array of probe_trace_event */
2992                 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
2993                                   *tevs2, ntevs2 * sizeof(**tevs2));
2994                 if (!new_tevs)
2995                         ret = -ENOMEM;
2996                 else {
2997                         free(*tevs);
2998                         *tevs = new_tevs;
2999                         *ntevs += ntevs2;
3000                 }
3001         }
3002         if (ret < 0)
3003                 clear_probe_trace_events(*tevs2, ntevs2);
3004         zfree(tevs2);
3005 
3006         return ret;
3007 }
3008 
3009 /*
3010  * Try to find probe_trace_event from given probe caches. Return the number
3011  * of cached events found, if an error occurs return the error.
3012  */
3013 static int find_cached_events(struct perf_probe_event *pev,
3014                               struct probe_trace_event **tevs,
3015                               const char *target)
3016 {
3017         struct probe_cache *cache;
3018         struct probe_cache_entry *entry;
3019         struct probe_trace_event *tmp_tevs = NULL;
3020         int ntevs = 0;
3021         int ret = 0;
3022 
3023         cache = probe_cache__new(target);
3024         /* Return 0 ("not found") if the target has no probe cache. */
3025         if (!cache)
3026                 return 0;
3027 
3028         for_each_probe_cache_entry(entry, cache) {
3029                 /* Skip the cache entry which has no name */
3030                 if (!entry->pev.event || !entry->pev.group)
3031                         continue;
3032                 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3033                     strglobmatch(entry->pev.event, pev->event)) {
3034                         ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3035                         if (ret > 0)
3036                                 ret = concat_probe_trace_events(tevs, &ntevs,
3037                                                                 &tmp_tevs, ret);
3038                         if (ret < 0)
3039                                 break;
3040                 }
3041         }
3042         probe_cache__delete(cache);
3043         if (ret < 0) {
3044                 clear_probe_trace_events(*tevs, ntevs);
3045                 zfree(tevs);
3046         } else {
3047                 ret = ntevs;
3048                 if (ntevs > 0 && target && target[0] == '/')
3049                         pev->uprobes = true;
3050         }
3051 
3052         return ret;
3053 }
3054 
3055 /* Try to find probe_trace_event from all probe caches */
3056 static int find_cached_events_all(struct perf_probe_event *pev,
3057                                    struct probe_trace_event **tevs)
3058 {
3059         struct probe_trace_event *tmp_tevs = NULL;
3060         struct strlist *bidlist;
3061         struct str_node *nd;
3062         char *pathname;
3063         int ntevs = 0;
3064         int ret;
3065 
3066         /* Get the buildid list of all valid caches */
3067         bidlist = build_id_cache__list_all(true);
3068         if (!bidlist) {
3069                 ret = -errno;
3070                 pr_debug("Failed to get buildids: %d\n", ret);
3071                 return ret;
3072         }
3073 
3074         ret = 0;
3075         strlist__for_each_entry(nd, bidlist) {
3076                 pathname = build_id_cache__origname(nd->s);
3077                 ret = find_cached_events(pev, &tmp_tevs, pathname);
3078                 /* In the case of cnt == 0, we just skip it */
3079                 if (ret > 0)
3080                         ret = concat_probe_trace_events(tevs, &ntevs,
3081                                                         &tmp_tevs, ret);
3082                 free(pathname);
3083                 if (ret < 0)
3084                         break;
3085         }
3086         strlist__delete(bidlist);
3087 
3088         if (ret < 0) {
3089                 clear_probe_trace_events(*tevs, ntevs);
3090                 zfree(tevs);
3091         } else
3092                 ret = ntevs;
3093 
3094         return ret;
3095 }
3096 
3097 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3098                                               struct probe_trace_event **tevs)
3099 {
3100         struct probe_cache *cache;
3101         struct probe_cache_entry *entry;
3102         struct probe_trace_event *tev;
3103         struct str_node *node;
3104         int ret, i;
3105 
3106         if (pev->sdt) {
3107                 /* For SDT/cached events, we use special search functions */
3108                 if (!pev->target)
3109                         return find_cached_events_all(pev, tevs);
3110                 else
3111                         return find_cached_events(pev, tevs, pev->target);
3112         }
3113         cache = probe_cache__new(pev->target);
3114         if (!cache)
3115                 return 0;
3116 
3117         entry = probe_cache__find(cache, pev);
3118         if (!entry) {
3119                 /* SDT must be in the cache */
3120                 ret = pev->sdt ? -ENOENT : 0;
3121                 goto out;
3122         }
3123 
3124         ret = strlist__nr_entries(entry->tevlist);
3125         if (ret > probe_conf.max_probes) {
3126                 pr_debug("Too many entries matched in the cache of %s\n",
3127                          pev->target ? : "kernel");
3128                 ret = -E2BIG;
3129                 goto out;
3130         }
3131 
3132         *tevs = zalloc(ret * sizeof(*tev));
3133         if (!*tevs) {
3134                 ret = -ENOMEM;
3135                 goto out;
3136         }
3137 
3138         i = 0;
3139         strlist__for_each_entry(node, entry->tevlist) {
3140                 tev = &(*tevs)[i++];
3141                 ret = parse_probe_trace_command(node->s, tev);
3142                 if (ret < 0)
3143                         goto out;
3144                 /* Set the uprobes attribute as same as original */
3145                 tev->uprobes = pev->uprobes;
3146         }
3147         ret = i;
3148 
3149 out:
3150         probe_cache__delete(cache);
3151         return ret;
3152 }
3153 
3154 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3155                                          struct probe_trace_event **tevs)
3156 {
3157         int ret;
3158 
3159         if (!pev->group && !pev->sdt) {
3160                 /* Set group name if not given */
3161                 if (!pev->uprobes) {
3162                         pev->group = strdup(PERFPROBE_GROUP);
3163                         ret = pev->group ? 0 : -ENOMEM;
3164                 } else
3165                         ret = convert_exec_to_group(pev->target, &pev->group);
3166                 if (ret != 0) {
3167                         pr_warning("Failed to make a group name.\n");
3168                         return ret;
3169                 }
3170         }
3171 
3172         ret = try_to_find_absolute_address(pev, tevs);
3173         if (ret > 0)
3174                 return ret;
3175 
3176         /* At first, we need to lookup cache entry */
3177         ret = find_probe_trace_events_from_cache(pev, tevs);
3178         if (ret > 0 || pev->sdt)        /* SDT can be found only in the cache */
3179                 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3180 
3181         /* Convert perf_probe_event with debuginfo */
3182         ret = try_to_find_probe_trace_events(pev, tevs);
3183         if (ret != 0)
3184                 return ret;     /* Found in debuginfo or got an error */
3185 
3186         return find_probe_trace_events_from_map(pev, tevs);
3187 }
3188 
3189 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3190 {
3191         int i, ret;
3192 
3193         /* Loop 1: convert all events */
3194         for (i = 0; i < npevs; i++) {
3195                 /* Init kprobe blacklist if needed */
3196                 if (!pevs[i].uprobes)
3197                         kprobe_blacklist__init();
3198                 /* Convert with or without debuginfo */
3199                 ret  = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3200                 if (ret < 0)
3201                         return ret;
3202                 pevs[i].ntevs = ret;
3203         }
3204         /* This just release blacklist only if allocated */
3205         kprobe_blacklist__release();
3206 
3207         return 0;
3208 }
3209 
3210 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3211 {
3212         int i, ret = 0;
3213 
3214         /* Loop 2: add all events */
3215         for (i = 0; i < npevs; i++) {
3216                 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3217                                                pevs[i].ntevs,
3218                                                probe_conf.force_add);
3219                 if (ret < 0)
3220                         break;
3221         }
3222         return ret;
3223 }
3224 
3225 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3226 {
3227         int i, j;
3228 
3229         /* Loop 3: cleanup and free trace events  */
3230         for (i = 0; i < npevs; i++) {
3231                 for (j = 0; j < pevs[i].ntevs; j++)
3232                         clear_probe_trace_event(&pevs[i].tevs[j]);
3233                 zfree(&pevs[i].tevs);
3234                 pevs[i].ntevs = 0;
3235                 clear_perf_probe_event(&pevs[i]);
3236         }
3237 }
3238 
3239 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3240 {
3241         int ret;
3242 
3243         ret = init_probe_symbol_maps(pevs->uprobes);
3244         if (ret < 0)
3245                 return ret;
3246 
3247         ret = convert_perf_probe_events(pevs, npevs);
3248         if (ret == 0)
3249                 ret = apply_perf_probe_events(pevs, npevs);
3250 
3251         cleanup_perf_probe_events(pevs, npevs);
3252 
3253         exit_probe_symbol_maps();
3254         return ret;
3255 }
3256 
3257 int del_perf_probe_events(struct strfilter *filter)
3258 {
3259         int ret, ret2, ufd = -1, kfd = -1;
3260         char *str = strfilter__string(filter);
3261 
3262         if (!str)
3263                 return -EINVAL;
3264 
3265         /* Get current event names */
3266         ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3267         if (ret < 0)
3268                 goto out;
3269 
3270         ret = probe_file__del_events(kfd, filter);
3271         if (ret < 0 && ret != -ENOENT)
3272                 goto error;
3273 
3274         ret2 = probe_file__del_events(ufd, filter);
3275         if (ret2 < 0 && ret2 != -ENOENT) {
3276                 ret = ret2;
3277                 goto error;
3278         }
3279         ret = 0;
3280 
3281 error:
3282         if (kfd >= 0)
3283                 close(kfd);
3284         if (ufd >= 0)
3285                 close(ufd);
3286 out:
3287         free(str);
3288 
3289         return ret;
3290 }
3291 
3292 /* TODO: don't use a global variable for filter ... */
3293 static struct strfilter *available_func_filter;
3294 
3295 /*
3296  * If a symbol corresponds to a function with global binding and
3297  * matches filter return 0. For all others return 1.
3298  */
3299 static int filter_available_functions(struct map *map __maybe_unused,
3300                                       struct symbol *sym)
3301 {
3302         if (strfilter__compare(available_func_filter, sym->name))
3303                 return 0;
3304         return 1;
3305 }
3306 
3307 int show_available_funcs(const char *target, struct strfilter *_filter,
3308                                         bool user)
3309 {
3310         struct map *map;
3311         int ret;
3312 
3313         ret = init_probe_symbol_maps(user);
3314         if (ret < 0)
3315                 return ret;
3316 
3317         /* Get a symbol map */
3318         if (user)
3319                 map = dso__new_map(target);
3320         else
3321                 map = kernel_get_module_map(target);
3322         if (!map) {
3323                 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3324                 return -EINVAL;
3325         }
3326 
3327         /* Load symbols with given filter */
3328         available_func_filter = _filter;
3329         ret = map__load(map, filter_available_functions);
3330         if (ret) {
3331                 if (ret == -2) {
3332                         char *str = strfilter__string(_filter);
3333                         pr_err("Failed to find symbols matched to \"%s\"\n",
3334                                str);
3335                         free(str);
3336                 } else
3337                         pr_err("Failed to load symbols in %s\n",
3338                                (target) ? : "kernel");
3339                 goto end;
3340         }
3341         if (!dso__sorted_by_name(map->dso, map->type))
3342                 dso__sort_by_name(map->dso, map->type);
3343 
3344         /* Show all (filtered) symbols */
3345         setup_pager();
3346         dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
3347 end:
3348         if (user) {
3349                 map__put(map);
3350         }
3351         exit_probe_symbol_maps();
3352 
3353         return ret;
3354 }
3355 
3356 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3357                             struct perf_probe_arg *pvar)
3358 {
3359         tvar->value = strdup(pvar->var);
3360         if (tvar->value == NULL)
3361                 return -ENOMEM;
3362         if (pvar->type) {
3363                 tvar->type = strdup(pvar->type);
3364                 if (tvar->type == NULL)
3365                         return -ENOMEM;
3366         }
3367         if (pvar->name) {
3368                 tvar->name = strdup(pvar->name);
3369                 if (tvar->name == NULL)
3370                         return -ENOMEM;
3371         } else
3372                 tvar->name = NULL;
3373         return 0;
3374 }
3375 

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