2 * probe-event.c : perf-probe definition to probe_events format converter
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
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.
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.
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.
23 #include <sys/utsname.h>
24 #include <sys/types.h>
39 #include "strfilter.h"
45 #include <api/fs/fs.h>
46 #include "trace-event.h" /* For __maybe_unused */
47 #include "probe-event.h"
48 #include "probe-finder.h"
49 #include "probe-file.h"
53 #include "sane_ctype.h"
55 #define PERFPROBE_GROUP "probe"
57 bool probe_event_dry_run; /* Dry run flag */
58 struct probe_conf probe_conf;
60 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
62 int e_snprintf(char *str, size_t size, const char *format, ...)
67 ret = vsnprintf(str, size, format, ap);
74 static struct machine *host_machine;
76 /* Initialize symbol maps and path of vmlinux/modules */
77 int init_probe_symbol_maps(bool user_only)
81 symbol_conf.sort_by_name = true;
82 symbol_conf.allow_aliases = true;
83 ret = symbol__init(NULL);
85 pr_debug("Failed to init symbol map.\n");
89 if (host_machine || user_only) /* already initialized */
92 if (symbol_conf.vmlinux_name)
93 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
95 host_machine = machine__new_host();
97 pr_debug("machine__new_host() failed.\n");
103 pr_warning("Failed to init vmlinux path.\n");
107 void exit_probe_symbol_maps(void)
109 machine__delete(host_machine);
114 static struct symbol *__find_kernel_function_by_name(const char *name,
117 return machine__find_kernel_function_by_name(host_machine, name, mapp);
120 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
122 return machine__find_kernel_function(host_machine, addr, mapp);
125 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap)
127 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
129 struct map *map = machine__kernel_map(host_machine);
131 if (map__load(map) < 0)
134 kmap = map__kmap(map);
141 return kmap->ref_reloc_sym;
144 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
145 bool reloc, bool reladdr)
147 struct ref_reloc_sym *reloc_sym;
151 /* ref_reloc_sym is just a label. Need a special fix*/
152 reloc_sym = kernel_get_ref_reloc_sym(NULL);
153 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
154 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
156 sym = __find_kernel_function_by_name(name, &map);
159 *addr = map->unmap_ip(map, sym->start) -
160 ((reloc) ? 0 : map->reloc) -
161 ((reladdr) ? map->start : 0);
166 static struct map *kernel_get_module_map(const char *module)
168 struct map_groups *grp = &host_machine->kmaps;
169 struct maps *maps = &grp->maps[MAP__FUNCTION];
172 /* A file path -- this is an offline module */
173 if (module && strchr(module, '/'))
174 return dso__new_map(module);
177 pos = machine__kernel_map(host_machine);
178 return map__get(pos);
181 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
182 /* short_name is "[module]" */
183 if (strncmp(pos->dso->short_name + 1, module,
184 pos->dso->short_name_len - 2) == 0 &&
185 module[pos->dso->short_name_len - 2] == '\0') {
193 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
195 /* Init maps of given executable or kernel */
199 map = dso__new_map(target);
200 if (map && map->dso) {
201 nsinfo__put(map->dso->nsinfo);
202 map->dso->nsinfo = nsinfo__get(nsi);
206 return kernel_get_module_map(target);
210 static int convert_exec_to_group(const char *exec, char **result)
212 char *ptr1, *ptr2, *exec_copy;
216 exec_copy = strdup(exec);
220 ptr1 = basename(exec_copy);
226 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
227 if (!isalnum(*ptr2) && *ptr2 != '_') {
233 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
237 *result = strdup(buf);
238 ret = *result ? 0 : -ENOMEM;
245 static void clear_perf_probe_point(struct perf_probe_point *pp)
252 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
256 for (i = 0; i < ntevs; i++)
257 clear_probe_trace_event(tevs + i);
260 static bool kprobe_blacklist__listed(unsigned long address);
261 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
266 /* Get the address of _etext for checking non-probable text symbol */
267 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
270 if (ret == 0 && etext_addr < address)
271 pr_warning("%s is out of .text, skip it.\n", symbol);
272 else if (kprobe_blacklist__listed(address))
273 pr_warning("%s is blacklisted function, skip it.\n", symbol);
281 * @module can be module name of module file path. In case of path,
282 * inspect elf and find out what is actual module name.
283 * Caller has to free mod_name after using it.
285 static char *find_module_name(const char *module)
293 char *mod_name = NULL;
296 fd = open(module, O_RDONLY);
300 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
304 if (gelf_getehdr(elf, &ehdr) == NULL)
307 sec = elf_section_by_name(elf, &ehdr, &shdr,
308 ".gnu.linkonce.this_module", NULL);
312 data = elf_getdata(sec, NULL);
313 if (!data || !data->d_buf)
318 * '.gnu.linkonce.this_module' section of kernel module elf directly
319 * maps to 'struct module' from linux/module.h. This section contains
320 * actual module name which will be used by kernel after loading it.
321 * But, we cannot use 'struct module' here since linux/module.h is not
322 * exposed to user-space. Offset of 'name' has remained same from long
323 * time, so hardcoding it here.
325 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
327 else /* expect ELFCLASS64 by default */
330 mod_name = strdup((char *)data->d_buf + name_offset);
339 #ifdef HAVE_DWARF_SUPPORT
341 static int kernel_get_module_dso(const char *module, struct dso **pdso)
345 const char *vmlinux_name;
349 char module_name[128];
351 snprintf(module_name, sizeof(module_name), "[%s]", module);
352 map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name);
357 pr_debug("Failed to find module %s.\n", module);
361 map = machine__kernel_map(host_machine);
364 vmlinux_name = symbol_conf.vmlinux_name;
367 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
369 ret = dso__load_vmlinux_path(dso, map);
376 * Some binaries like glibc have special symbols which are on the symbol
377 * table, but not in the debuginfo. If we can find the address of the
378 * symbol from map, we can translate the address back to the probe point.
380 static int find_alternative_probe_point(struct debuginfo *dinfo,
381 struct perf_probe_point *pp,
382 struct perf_probe_point *result,
383 const char *target, struct nsinfo *nsi,
386 struct map *map = NULL;
391 /* This can work only for function-name based one */
392 if (!pp->function || pp->file)
395 map = get_target_map(target, nsi, uprobes);
399 /* Find the address of given function */
400 map__for_each_symbol_by_name(map, pp->function, sym) {
402 address = sym->start;
404 address = map->unmap_ip(map, sym->start) - map->reloc;
411 pr_debug("Symbol %s address found : %" PRIx64 "\n",
412 pp->function, address);
414 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
417 ret = (!ret) ? -ENOENT : ret;
419 result->offset += pp->offset;
420 result->line += pp->line;
421 result->retprobe = pp->retprobe;
431 static int get_alternative_probe_event(struct debuginfo *dinfo,
432 struct perf_probe_event *pev,
433 struct perf_probe_point *tmp)
437 memcpy(tmp, &pev->point, sizeof(*tmp));
438 memset(&pev->point, 0, sizeof(pev->point));
439 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
440 pev->nsi, pev->uprobes);
442 memcpy(&pev->point, tmp, sizeof(*tmp));
447 static int get_alternative_line_range(struct debuginfo *dinfo,
448 struct line_range *lr,
449 const char *target, bool user)
451 struct perf_probe_point pp = { .function = lr->function,
454 struct perf_probe_point result;
457 memset(&result, 0, sizeof(result));
459 if (lr->end != INT_MAX)
460 len = lr->end - lr->start;
461 ret = find_alternative_probe_point(dinfo, &pp, &result,
464 lr->function = result.function;
465 lr->file = result.file;
466 lr->start = result.line;
467 if (lr->end != INT_MAX)
468 lr->end = lr->start + len;
469 clear_perf_probe_point(&pp);
474 /* Open new debuginfo of given module */
475 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
478 const char *path = module;
479 char reason[STRERR_BUFSIZE];
480 struct debuginfo *ret = NULL;
481 struct dso *dso = NULL;
485 if (!module || !strchr(module, '/')) {
486 err = kernel_get_module_dso(module, &dso);
488 if (!dso || dso->load_errno == 0) {
489 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
490 strcpy(reason, "(unknown)");
492 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
494 pr_err("Failed to find the path for %s: %s\n",
495 module ?: "kernel", reason);
498 path = dso->long_name;
500 nsinfo__mountns_enter(nsi, &nsc);
501 ret = debuginfo__new(path);
502 if (!ret && !silent) {
503 pr_warning("The %s file has no debug information.\n", path);
504 if (!module || !strtailcmp(path, ".ko"))
505 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
507 pr_warning("Rebuild with -g, ");
508 pr_warning("or install an appropriate debuginfo package.\n");
510 nsinfo__mountns_exit(&nsc);
514 /* For caching the last debuginfo */
515 static struct debuginfo *debuginfo_cache;
516 static char *debuginfo_cache_path;
518 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
520 const char *path = module;
522 /* If the module is NULL, it should be the kernel. */
526 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
529 /* Copy module path */
530 free(debuginfo_cache_path);
531 debuginfo_cache_path = strdup(path);
532 if (!debuginfo_cache_path) {
533 debuginfo__delete(debuginfo_cache);
534 debuginfo_cache = NULL;
538 debuginfo_cache = open_debuginfo(module, NULL, silent);
539 if (!debuginfo_cache)
540 zfree(&debuginfo_cache_path);
542 return debuginfo_cache;
545 static void debuginfo_cache__exit(void)
547 debuginfo__delete(debuginfo_cache);
548 debuginfo_cache = NULL;
549 zfree(&debuginfo_cache_path);
553 static int get_text_start_address(const char *exec, unsigned long *address,
559 int fd, ret = -ENOENT;
562 nsinfo__mountns_enter(nsi, &nsc);
563 fd = open(exec, O_RDONLY);
564 nsinfo__mountns_exit(&nsc);
568 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
574 if (gelf_getehdr(elf, &ehdr) == NULL)
577 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
580 *address = shdr.sh_addr - shdr.sh_offset;
591 * Convert trace point to probe point with debuginfo
593 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
594 struct perf_probe_point *pp,
597 struct debuginfo *dinfo = NULL;
598 unsigned long stext = 0;
599 u64 addr = tp->address;
602 /* convert the address to dwarf address */
608 ret = get_text_start_address(tp->module, &stext, NULL);
612 } else if (tp->symbol) {
613 /* If the module is given, this returns relative address */
614 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
615 false, !!tp->module);
621 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
622 tp->module ? : "kernel");
624 dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
626 ret = debuginfo__find_probe_point(dinfo,
627 (unsigned long)addr, pp);
632 pp->retprobe = tp->retprobe;
636 pr_debug("Failed to find corresponding probes from debuginfo.\n");
637 return ret ? : -ENOENT;
640 /* Adjust symbol name and address */
641 static int post_process_probe_trace_point(struct probe_trace_point *tp,
642 struct map *map, unsigned long offs)
645 u64 addr = tp->address - offs;
647 sym = map__find_symbol(map, addr);
651 if (strcmp(sym->name, tp->symbol)) {
652 /* If we have no realname, use symbol for it */
654 tp->realname = tp->symbol;
657 tp->symbol = strdup(sym->name);
661 tp->offset = addr - sym->start;
668 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
669 * and generate new symbols with suffixes such as .constprop.N or .isra.N
670 * etc. Since those symbols are not recorded in DWARF, we have to find
671 * correct generated symbols from offline ELF binary.
672 * For online kernel or uprobes we don't need this because those are
673 * rebased on _text, or already a section relative address.
676 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
677 int ntevs, const char *pathname)
680 unsigned long stext = 0;
683 /* Prepare a map for offline binary */
684 map = dso__new_map(pathname);
685 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
686 pr_warning("Failed to get ELF symbols for %s\n", pathname);
690 for (i = 0; i < ntevs; i++) {
691 ret = post_process_probe_trace_point(&tevs[i].point,
701 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
702 int ntevs, const char *exec,
706 unsigned long stext = 0;
711 ret = get_text_start_address(exec, &stext, nsi);
715 for (i = 0; i < ntevs && ret >= 0; i++) {
716 /* point.address is the addres of point.symbol + point.offset */
717 tevs[i].point.address -= stext;
718 tevs[i].point.module = strdup(exec);
719 if (!tevs[i].point.module) {
723 tevs[i].uprobes = true;
730 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
731 int ntevs, const char *module,
732 struct debuginfo *dinfo)
734 Dwarf_Addr text_offs = 0;
736 char *mod_name = NULL;
742 map = get_target_map(module, NULL, false);
743 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
744 pr_warning("Failed to get ELF symbols for %s\n", module);
748 mod_name = find_module_name(module);
749 for (i = 0; i < ntevs; i++) {
750 ret = post_process_probe_trace_point(&tevs[i].point,
751 map, (unsigned long)text_offs);
754 tevs[i].point.module =
755 strdup(mod_name ? mod_name : module);
756 if (!tevs[i].point.module) {
769 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
772 struct ref_reloc_sym *reloc_sym;
777 /* Skip post process if the target is an offline kernel */
778 if (symbol_conf.ignore_vmlinux_buildid)
779 return post_process_offline_probe_trace_events(tevs, ntevs,
780 symbol_conf.vmlinux_name);
782 reloc_sym = kernel_get_ref_reloc_sym(&map);
784 pr_warning("Relocated base symbol is not found!\n");
788 for (i = 0; i < ntevs; i++) {
789 if (!tevs[i].point.address)
791 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
794 * If we found a wrong one, mark it by NULL symbol.
795 * Since addresses in debuginfo is same as objdump, we need
796 * to convert it to addresses on memory.
798 if (kprobe_warn_out_range(tevs[i].point.symbol,
799 map__objdump_2mem(map, tevs[i].point.address))) {
803 tmp = strdup(reloc_sym->name);
807 /* If we have no realname, use symbol for it */
808 if (!tevs[i].point.realname)
809 tevs[i].point.realname = tevs[i].point.symbol;
811 free(tevs[i].point.symbol);
812 tevs[i].point.symbol = tmp;
813 tevs[i].point.offset = tevs[i].point.address -
814 reloc_sym->unrelocated_addr;
820 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
821 int ntevs __maybe_unused)
825 /* Post processing the probe events */
826 static int post_process_probe_trace_events(struct perf_probe_event *pev,
827 struct probe_trace_event *tevs,
828 int ntevs, const char *module,
829 bool uprobe, struct debuginfo *dinfo)
834 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
837 /* Currently ref_reloc_sym based probe is not for drivers */
838 ret = post_process_module_probe_trace_events(tevs, ntevs,
841 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
844 arch__post_process_probe_trace_events(pev, ntevs);
849 /* Try to find perf_probe_event with debuginfo */
850 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
851 struct probe_trace_event **tevs)
853 bool need_dwarf = perf_probe_event_need_dwarf(pev);
854 struct perf_probe_point tmp;
855 struct debuginfo *dinfo;
858 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
862 pr_debug("Could not open debuginfo. Try to use symbols.\n");
866 pr_debug("Try to find probe point from debuginfo.\n");
867 /* Searching trace events corresponding to a probe event */
868 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
870 if (ntevs == 0) { /* Not found, retry with an alternative */
871 ret = get_alternative_probe_event(dinfo, pev, &tmp);
873 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
875 * Write back to the original probe_event for
876 * setting appropriate (user given) event name
878 clear_perf_probe_point(&pev->point);
879 memcpy(&pev->point, &tmp, sizeof(tmp));
883 if (ntevs > 0) { /* Succeeded to find trace events */
884 pr_debug("Found %d probe_trace_events.\n", ntevs);
885 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
886 pev->target, pev->uprobes, dinfo);
887 if (ret < 0 || ret == ntevs) {
888 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
889 clear_probe_trace_events(*tevs, ntevs);
895 debuginfo__delete(dinfo);
897 if (ntevs == 0) { /* No error but failed to find probe point. */
898 pr_warning("Probe point '%s' not found.\n",
899 synthesize_perf_probe_point(&pev->point));
901 } else if (ntevs < 0) {
902 /* Error path : ntevs < 0 */
903 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
905 pr_warning("Warning: No dwarf info found in the vmlinux - "
906 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
908 pr_debug("Trying to use symbols.\n");
915 #define LINEBUF_SIZE 256
916 #define NR_ADDITIONAL_LINES 2
918 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
920 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
921 const char *color = show_num ? "" : PERF_COLOR_BLUE;
922 const char *prefix = NULL;
925 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
930 prefix = show_num ? "%7d " : " ";
931 color_fprintf(stdout, color, prefix, l);
933 color_fprintf(stdout, color, "%s", buf);
935 } while (strchr(buf, '\n') == NULL);
940 pr_warning("File read error: %s\n",
941 str_error_r(errno, sbuf, sizeof(sbuf)));
947 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
949 int rv = __show_one_line(fp, l, skip, show_num);
951 pr_warning("Source file is shorter than expected.\n");
957 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
958 #define show_one_line(f,l) _show_one_line(f,l,false,false)
959 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
960 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
963 * Show line-range always requires debuginfo to find source file and
966 static int __show_line_range(struct line_range *lr, const char *module,
971 struct debuginfo *dinfo;
975 char sbuf[STRERR_BUFSIZE];
977 /* Search a line range */
978 dinfo = open_debuginfo(module, NULL, false);
982 ret = debuginfo__find_line_range(dinfo, lr);
983 if (!ret) { /* Not found, retry with an alternative */
984 ret = get_alternative_line_range(dinfo, lr, module, user);
986 ret = debuginfo__find_line_range(dinfo, lr);
988 debuginfo__delete(dinfo);
989 if (ret == 0 || ret == -ENOENT) {
990 pr_warning("Specified source line is not found.\n");
992 } else if (ret < 0) {
993 pr_warning("Debuginfo analysis failed.\n");
997 /* Convert source file path */
999 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
1001 /* Free old path when new path is assigned */
1002 if (tmp != lr->path)
1006 pr_warning("Failed to find source file path.\n");
1013 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
1014 lr->start - lr->offset);
1016 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
1018 fp = fopen(lr->path, "r");
1020 pr_warning("Failed to open %s: %s\n", lr->path,
1021 str_error_r(errno, sbuf, sizeof(sbuf)));
1024 /* Skip to starting line number */
1025 while (l < lr->start) {
1026 ret = skip_one_line(fp, l++);
1031 intlist__for_each_entry(ln, lr->line_list) {
1032 for (; ln->i > l; l++) {
1033 ret = show_one_line(fp, l - lr->offset);
1037 ret = show_one_line_with_num(fp, l++ - lr->offset);
1042 if (lr->end == INT_MAX)
1043 lr->end = l + NR_ADDITIONAL_LINES;
1044 while (l <= lr->end) {
1045 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1054 int show_line_range(struct line_range *lr, const char *module,
1055 struct nsinfo *nsi, bool user)
1058 struct nscookie nsc;
1060 ret = init_probe_symbol_maps(user);
1063 nsinfo__mountns_enter(nsi, &nsc);
1064 ret = __show_line_range(lr, module, user);
1065 nsinfo__mountns_exit(&nsc);
1066 exit_probe_symbol_maps();
1071 static int show_available_vars_at(struct debuginfo *dinfo,
1072 struct perf_probe_event *pev,
1073 struct strfilter *_filter)
1077 struct str_node *node;
1078 struct variable_list *vls = NULL, *vl;
1079 struct perf_probe_point tmp;
1082 buf = synthesize_perf_probe_point(&pev->point);
1085 pr_debug("Searching variables at %s\n", buf);
1087 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1088 if (!ret) { /* Not found, retry with an alternative */
1089 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1091 ret = debuginfo__find_available_vars_at(dinfo, pev,
1093 /* Release the old probe_point */
1094 clear_perf_probe_point(&tmp);
1098 if (ret == 0 || ret == -ENOENT) {
1099 pr_err("Failed to find the address of %s\n", buf);
1102 pr_warning("Debuginfo analysis failed.\n");
1106 /* Some variables are found */
1107 fprintf(stdout, "Available variables at %s\n", buf);
1108 for (i = 0; i < ret; i++) {
1111 * A probe point might be converted to
1112 * several trace points.
1114 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1116 zfree(&vl->point.symbol);
1119 strlist__for_each_entry(node, vl->vars) {
1120 var = strchr(node->s, '\t') + 1;
1121 if (strfilter__compare(_filter, var)) {
1122 fprintf(stdout, "\t\t%s\n", node->s);
1126 strlist__delete(vl->vars);
1129 fprintf(stdout, "\t\t(No matched variables)\n");
1137 /* Show available variables on given probe point */
1138 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1139 struct strfilter *_filter)
1142 struct debuginfo *dinfo;
1144 ret = init_probe_symbol_maps(pevs->uprobes);
1148 dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1156 for (i = 0; i < npevs && ret >= 0; i++)
1157 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1159 debuginfo__delete(dinfo);
1161 exit_probe_symbol_maps();
1165 #else /* !HAVE_DWARF_SUPPORT */
1167 static void debuginfo_cache__exit(void)
1172 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1173 struct perf_probe_point *pp __maybe_unused,
1174 bool is_kprobe __maybe_unused)
1179 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1180 struct probe_trace_event **tevs __maybe_unused)
1182 if (perf_probe_event_need_dwarf(pev)) {
1183 pr_warning("Debuginfo-analysis is not supported.\n");
1190 int show_line_range(struct line_range *lr __maybe_unused,
1191 const char *module __maybe_unused,
1192 struct nsinfo *nsi __maybe_unused,
1193 bool user __maybe_unused)
1195 pr_warning("Debuginfo-analysis is not supported.\n");
1199 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1200 int npevs __maybe_unused,
1201 struct strfilter *filter __maybe_unused)
1203 pr_warning("Debuginfo-analysis is not supported.\n");
1208 void line_range__clear(struct line_range *lr)
1214 intlist__delete(lr->line_list);
1215 memset(lr, 0, sizeof(*lr));
1218 int line_range__init(struct line_range *lr)
1220 memset(lr, 0, sizeof(*lr));
1221 lr->line_list = intlist__new(NULL);
1228 static int parse_line_num(char **ptr, int *val, const char *what)
1230 const char *start = *ptr;
1233 *val = strtol(*ptr, ptr, 0);
1234 if (errno || *ptr == start) {
1235 semantic_error("'%s' is not a valid number.\n", what);
1241 /* Check the name is good for event, group or function */
1242 static bool is_c_func_name(const char *name)
1244 if (!isalpha(*name) && *name != '_')
1246 while (*++name != '\0') {
1247 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1254 * Stuff 'lr' according to the line range described by 'arg'.
1255 * The line range syntax is described by:
1257 * SRC[:SLN[+NUM|-ELN]]
1258 * FNC[@SRC][:SLN[+NUM|-ELN]]
1260 int parse_line_range_desc(const char *arg, struct line_range *lr)
1262 char *range, *file, *name = strdup(arg);
1271 range = strchr(name, ':');
1275 err = parse_line_num(&range, &lr->start, "start line");
1279 if (*range == '+' || *range == '-') {
1280 const char c = *range++;
1282 err = parse_line_num(&range, &lr->end, "end line");
1287 lr->end += lr->start;
1289 * Adjust the number of lines here.
1290 * If the number of lines == 1, the
1291 * the end of line should be equal to
1292 * the start of line.
1298 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1301 if (lr->start > lr->end) {
1302 semantic_error("Start line must be smaller"
1303 " than end line.\n");
1306 if (*range != '\0') {
1307 semantic_error("Tailing with invalid str '%s'.\n", range);
1312 file = strchr(name, '@');
1315 lr->file = strdup(++file);
1316 if (lr->file == NULL) {
1320 lr->function = name;
1321 } else if (strchr(name, '/') || strchr(name, '.'))
1323 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1324 lr->function = name;
1325 else { /* Invalid name */
1326 semantic_error("'%s' is not a valid function name.\n", name);
1337 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1341 ptr = strchr(*arg, ':');
1344 if (!pev->sdt && !is_c_func_name(*arg))
1346 pev->group = strdup(*arg);
1352 if (!pev->sdt && !is_c_func_name(*arg)) {
1354 semantic_error("%s is bad for event name -it must "
1355 "follow C symbol-naming rule.\n", *arg);
1358 pev->event = strdup(*arg);
1359 if (pev->event == NULL)
1365 /* Parse probepoint definition. */
1366 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1368 struct perf_probe_point *pp = &pev->point;
1371 bool file_spec = false;
1376 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1377 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1378 * perf probe %[GRP:]SDT_EVENT
1383 if (is_sdt_event(arg)) {
1389 ptr = strpbrk(arg, ";=@+%");
1393 semantic_error("%s must be an SDT name.\n",
1397 /* This must be a target file name or build id */
1398 tmp = build_id_cache__complement(ptr + 1);
1400 pev->target = build_id_cache__origname(tmp);
1403 pev->target = strdup(ptr + 1);
1408 ret = parse_perf_probe_event_name(&arg, pev);
1410 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1416 if (ptr && *ptr == '=') { /* Event name */
1419 ret = parse_perf_probe_event_name(&arg, pev);
1427 * Check arg is function or file name and copy it.
1429 * We consider arg to be a file spec if and only if it satisfies
1430 * all of the below criteria::
1431 * - it does not include any of "+@%",
1432 * - it includes one of ":;", and
1433 * - it has a period '.' in the name.
1435 * Otherwise, we consider arg to be a function specification.
1437 if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
1438 /* This is a file spec if it includes a '.' before ; or : */
1439 if (memchr(arg, '.', ptr - arg))
1443 ptr = strpbrk(arg, ";:+@%");
1463 * Keep pp->function even if this is absolute address,
1464 * so it can mark whether abs_address is valid.
1465 * Which make 'perf probe lib.bin 0x0' possible.
1467 * Note that checking length of tmp is not needed
1468 * because when we access tmp[1] we know tmp[0] is '0',
1469 * so tmp[1] should always valid (but could be '\0').
1471 if (tmp && !strncmp(tmp, "0x", 2)) {
1472 pp->abs_address = strtoul(pp->function, &tmp, 0);
1474 semantic_error("Invalid absolute address.\n");
1480 /* Parse other options */
1484 if (c == ';') { /* Lazy pattern must be the last part */
1485 pp->lazy_line = strdup(arg);
1486 if (pp->lazy_line == NULL)
1490 ptr = strpbrk(arg, ";:+@%");
1496 case ':': /* Line number */
1497 pp->line = strtoul(arg, &tmp, 0);
1499 semantic_error("There is non-digit char"
1500 " in line number.\n");
1504 case '+': /* Byte offset from a symbol */
1505 pp->offset = strtoul(arg, &tmp, 0);
1507 semantic_error("There is non-digit character"
1512 case '@': /* File name */
1514 semantic_error("SRC@SRC is not allowed.\n");
1517 pp->file = strdup(arg);
1518 if (pp->file == NULL)
1521 case '%': /* Probe places */
1522 if (strcmp(arg, "return") == 0) {
1524 } else { /* Others not supported yet */
1525 semantic_error("%%%s is not supported.\n", arg);
1529 default: /* Buggy case */
1530 pr_err("This program has a bug at %s:%d.\n",
1531 __FILE__, __LINE__);
1537 /* Exclusion check */
1538 if (pp->lazy_line && pp->line) {
1539 semantic_error("Lazy pattern can't be used with"
1544 if (pp->lazy_line && pp->offset) {
1545 semantic_error("Lazy pattern can't be used with offset.\n");
1549 if (pp->line && pp->offset) {
1550 semantic_error("Offset can't be used with line number.\n");
1554 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1555 semantic_error("File always requires line number or "
1560 if (pp->offset && !pp->function) {
1561 semantic_error("Offset requires an entry function.\n");
1565 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1566 semantic_error("Offset/Line/Lazy pattern can't be used with "
1571 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1572 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1577 /* Parse perf-probe event argument */
1578 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1580 char *tmp, *goodname;
1581 struct perf_probe_arg_field **fieldp;
1583 pr_debug("parsing arg: %s into ", str);
1585 tmp = strchr(str, '=');
1587 arg->name = strndup(str, tmp - str);
1588 if (arg->name == NULL)
1590 pr_debug("name:%s ", arg->name);
1594 tmp = strchr(str, ':');
1595 if (tmp) { /* Type setting */
1597 arg->type = strdup(tmp + 1);
1598 if (arg->type == NULL)
1600 pr_debug("type:%s ", arg->type);
1603 tmp = strpbrk(str, "-.[");
1604 if (!is_c_varname(str) || !tmp) {
1605 /* A variable, register, symbol or special value */
1606 arg->var = strdup(str);
1607 if (arg->var == NULL)
1609 pr_debug("%s\n", arg->var);
1613 /* Structure fields or array element */
1614 arg->var = strndup(str, tmp - str);
1615 if (arg->var == NULL)
1617 goodname = arg->var;
1618 pr_debug("%s, ", arg->var);
1619 fieldp = &arg->field;
1622 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1623 if (*fieldp == NULL)
1625 if (*tmp == '[') { /* Array */
1627 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1628 (*fieldp)->ref = true;
1629 if (*tmp != ']' || tmp == str + 1) {
1630 semantic_error("Array index must be a"
1637 } else { /* Structure */
1640 (*fieldp)->ref = false;
1641 } else if (tmp[1] == '>') {
1643 (*fieldp)->ref = true;
1645 semantic_error("Argument parse error: %s\n",
1649 tmp = strpbrk(str, "-.[");
1652 (*fieldp)->name = strndup(str, tmp - str);
1653 if ((*fieldp)->name == NULL)
1656 goodname = (*fieldp)->name;
1657 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1658 fieldp = &(*fieldp)->next;
1661 (*fieldp)->name = strdup(str);
1662 if ((*fieldp)->name == NULL)
1665 goodname = (*fieldp)->name;
1666 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1668 /* If no name is specified, set the last field name (not array index)*/
1670 arg->name = strdup(goodname);
1671 if (arg->name == NULL)
1677 /* Parse perf-probe event command */
1678 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1681 int argc, i, ret = 0;
1683 argv = argv_split(cmd, &argc);
1685 pr_debug("Failed to split arguments.\n");
1688 if (argc - 1 > MAX_PROBE_ARGS) {
1689 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1693 /* Parse probe point */
1694 ret = parse_perf_probe_point(argv[0], pev);
1698 /* Copy arguments and ensure return probe has no C argument */
1699 pev->nargs = argc - 1;
1700 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1701 if (pev->args == NULL) {
1705 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1706 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1708 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1709 semantic_error("You can't specify local variable for"
1720 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1721 bool perf_probe_with_var(struct perf_probe_event *pev)
1725 for (i = 0; i < pev->nargs; i++)
1726 if (is_c_varname(pev->args[i].var) ||
1727 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1728 !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1733 /* Return true if this perf_probe_event requires debuginfo */
1734 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1736 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1739 if (perf_probe_with_var(pev))
1745 /* Parse probe_events event into struct probe_point */
1746 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1748 struct probe_trace_point *tp = &tev->point;
1751 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1755 pr_debug("Parsing probe_events: %s\n", cmd);
1756 argv = argv_split(cmd, &argc);
1758 pr_debug("Failed to split arguments.\n");
1762 semantic_error("Too few probe arguments.\n");
1767 /* Scan event and group name. */
1768 argv0_str = strdup(argv[0]);
1769 if (argv0_str == NULL) {
1773 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1774 fmt2_str = strtok_r(NULL, "/", &fmt);
1775 fmt3_str = strtok_r(NULL, " \t", &fmt);
1776 if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
1777 semantic_error("Failed to parse event name: %s\n", argv[0]);
1782 tev->group = strdup(fmt2_str);
1783 tev->event = strdup(fmt3_str);
1784 if (tev->group == NULL || tev->event == NULL) {
1788 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1790 tp->retprobe = (pr == 'r');
1792 /* Scan module name(if there), function name and offset */
1793 p = strchr(argv[1], ':');
1795 tp->module = strndup(argv[1], p - argv[1]);
1800 tev->uprobes = (tp->module[0] == '/');
1804 fmt1_str = strtok_r(p, "+", &fmt);
1805 /* only the address started with 0x */
1806 if (fmt1_str[0] == '0') {
1808 * Fix a special case:
1809 * if address == 0, kernel reports something like:
1810 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1811 * Newer kernel may fix that, but we want to
1812 * support old kernel also.
1814 if (strcmp(fmt1_str, "0x") == 0) {
1815 if (!argv[2] || strcmp(argv[2], "(null)")) {
1822 for (i = 2; argv[i + 1] != NULL; i++)
1823 argv[i] = argv[i + 1];
1828 tp->address = strtoul(fmt1_str, NULL, 0);
1830 /* Only the symbol-based probe has offset */
1831 tp->symbol = strdup(fmt1_str);
1832 if (tp->symbol == NULL) {
1836 fmt2_str = strtok_r(NULL, "", &fmt);
1837 if (fmt2_str == NULL)
1840 tp->offset = strtoul(fmt2_str, NULL, 10);
1843 tev->nargs = argc - 2;
1844 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1845 if (tev->args == NULL) {
1849 for (i = 0; i < tev->nargs; i++) {
1850 p = strchr(argv[i + 2], '=');
1851 if (p) /* We don't need which register is assigned. */
1855 tev->args[i].name = strdup(argv[i + 2]);
1856 /* TODO: parse regs and offset */
1857 tev->args[i].value = strdup(p);
1858 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1870 /* Compose only probe arg */
1871 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1873 struct perf_probe_arg_field *field = pa->field;
1878 if (strbuf_init(&buf, 64) < 0)
1881 if (pa->name && pa->var)
1882 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1884 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1889 if (field->name[0] == '[')
1890 err = strbuf_addstr(&buf, field->name);
1892 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1894 field = field->next;
1900 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1903 ret = strbuf_detach(&buf, NULL);
1905 strbuf_release(&buf);
1909 /* Compose only probe point (not argument) */
1910 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1913 char *tmp, *ret = NULL;
1916 if (strbuf_init(&buf, 64) < 0)
1920 if (strbuf_addstr(&buf, pp->function) < 0)
1923 err = strbuf_addf(&buf, "+%lu", pp->offset);
1925 err = strbuf_addf(&buf, ":%d", pp->line);
1926 else if (pp->retprobe)
1927 err = strbuf_addstr(&buf, "%return");
1935 tmp = strchr(pp->file + len - 30, '/');
1936 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1938 err = strbuf_addf(&buf, "@%s", tmp);
1939 if (!err && !pp->function && pp->line)
1940 err = strbuf_addf(&buf, ":%d", pp->line);
1943 ret = strbuf_detach(&buf, NULL);
1945 strbuf_release(&buf);
1949 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1952 char *tmp, *ret = NULL;
1955 if (strbuf_init(&buf, 64))
1958 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1962 tmp = synthesize_perf_probe_point(&pev->point);
1963 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1967 for (i = 0; i < pev->nargs; i++) {
1968 tmp = synthesize_perf_probe_arg(pev->args + i);
1969 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1974 ret = strbuf_detach(&buf, NULL);
1976 strbuf_release(&buf);
1980 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1981 struct strbuf *buf, int depth)
1985 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1990 err = strbuf_addf(buf, "%+ld(", ref->offset);
1991 return (err < 0) ? err : depth;
1994 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1997 struct probe_trace_arg_ref *ref = arg->ref;
2000 /* Argument name or separator */
2002 err = strbuf_addf(buf, " %s=", arg->name);
2004 err = strbuf_addch(buf, ' ');
2008 /* Special case: @XXX */
2009 if (arg->value[0] == '@' && arg->ref)
2012 /* Dereferencing arguments */
2014 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
2019 /* Print argument value */
2020 if (arg->value[0] == '@' && arg->ref)
2021 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2023 err = strbuf_addstr(buf, arg->value);
2026 while (!err && depth--)
2027 err = strbuf_addch(buf, ')');
2029 /* Print argument type */
2030 if (!err && arg->type)
2031 err = strbuf_addf(buf, ":%s", arg->type);
2036 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2038 struct probe_trace_point *tp = &tev->point;
2043 /* Uprobes must have tp->module */
2044 if (tev->uprobes && !tp->module)
2047 if (strbuf_init(&buf, 32) < 0)
2050 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2051 tev->group, tev->event) < 0)
2054 * If tp->address == 0, then this point must be a
2055 * absolute address uprobe.
2056 * try_to_find_absolute_address() should have made
2057 * tp->symbol to "0x0".
2059 if (tev->uprobes && !tp->address) {
2060 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2064 /* Use the tp->address for uprobes */
2066 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
2067 else if (!strncmp(tp->symbol, "0x", 2))
2068 /* Absolute address. See try_to_find_absolute_address() */
2069 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2070 tp->module ? ":" : "", tp->address);
2072 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2073 tp->module ? ":" : "", tp->symbol, tp->offset);
2077 for (i = 0; i < tev->nargs; i++)
2078 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
2081 ret = strbuf_detach(&buf, NULL);
2083 strbuf_release(&buf);
2087 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2088 struct perf_probe_point *pp,
2091 struct symbol *sym = NULL;
2092 struct map *map = NULL;
2093 u64 addr = tp->address;
2097 map = dso__new_map(tp->module);
2100 sym = map__find_symbol(map, addr);
2102 if (tp->symbol && !addr) {
2103 if (kernel_get_symbol_address_by_name(tp->symbol,
2104 &addr, true, false) < 0)
2109 sym = __find_kernel_function(addr, &map);
2116 pp->retprobe = tp->retprobe;
2117 pp->offset = addr - map->unmap_ip(map, sym->start);
2118 pp->function = strdup(sym->name);
2119 ret = pp->function ? 0 : -ENOMEM;
2122 if (map && !is_kprobe) {
2129 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2130 struct perf_probe_point *pp,
2136 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2139 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2143 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2146 pp->function = strdup(tp->symbol);
2147 pp->offset = tp->offset;
2149 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2152 pp->function = strdup(buf);
2155 if (pp->function == NULL)
2158 pp->retprobe = tp->retprobe;
2163 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2164 struct perf_probe_event *pev, bool is_kprobe)
2166 struct strbuf buf = STRBUF_INIT;
2169 /* Convert event/group name */
2170 pev->event = strdup(tev->event);
2171 pev->group = strdup(tev->group);
2172 if (pev->event == NULL || pev->group == NULL)
2175 /* Convert trace_point to probe_point */
2176 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2180 /* Convert trace_arg to probe_arg */
2181 pev->nargs = tev->nargs;
2182 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2183 if (pev->args == NULL)
2185 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2186 if (tev->args[i].name)
2187 pev->args[i].name = strdup(tev->args[i].name);
2189 if ((ret = strbuf_init(&buf, 32)) < 0)
2191 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2192 pev->args[i].name = strbuf_detach(&buf, NULL);
2194 if (pev->args[i].name == NULL && ret >= 0)
2199 clear_perf_probe_event(pev);
2204 void clear_perf_probe_event(struct perf_probe_event *pev)
2206 struct perf_probe_arg_field *field, *next;
2212 clear_perf_probe_point(&pev->point);
2214 for (i = 0; i < pev->nargs; i++) {
2215 free(pev->args[i].name);
2216 free(pev->args[i].var);
2217 free(pev->args[i].type);
2218 field = pev->args[i].field;
2221 zfree(&field->name);
2227 memset(pev, 0, sizeof(*pev));
2230 #define strdup_or_goto(str, label) \
2231 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2233 static int perf_probe_point__copy(struct perf_probe_point *dst,
2234 struct perf_probe_point *src)
2236 dst->file = strdup_or_goto(src->file, out_err);
2237 dst->function = strdup_or_goto(src->function, out_err);
2238 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2239 dst->line = src->line;
2240 dst->retprobe = src->retprobe;
2241 dst->offset = src->offset;
2245 clear_perf_probe_point(dst);
2249 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2250 struct perf_probe_arg *src)
2252 struct perf_probe_arg_field *field, **ppfield;
2254 dst->name = strdup_or_goto(src->name, out_err);
2255 dst->var = strdup_or_goto(src->var, out_err);
2256 dst->type = strdup_or_goto(src->type, out_err);
2259 ppfield = &(dst->field);
2261 *ppfield = zalloc(sizeof(*field));
2264 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2265 (*ppfield)->index = field->index;
2266 (*ppfield)->ref = field->ref;
2267 field = field->next;
2268 ppfield = &((*ppfield)->next);
2275 int perf_probe_event__copy(struct perf_probe_event *dst,
2276 struct perf_probe_event *src)
2280 dst->event = strdup_or_goto(src->event, out_err);
2281 dst->group = strdup_or_goto(src->group, out_err);
2282 dst->target = strdup_or_goto(src->target, out_err);
2283 dst->uprobes = src->uprobes;
2285 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2288 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2291 dst->nargs = src->nargs;
2293 for (i = 0; i < src->nargs; i++)
2294 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2299 clear_perf_probe_event(dst);
2303 void clear_probe_trace_event(struct probe_trace_event *tev)
2305 struct probe_trace_arg_ref *ref, *next;
2310 free(tev->point.symbol);
2311 free(tev->point.realname);
2312 free(tev->point.module);
2313 for (i = 0; i < tev->nargs; i++) {
2314 free(tev->args[i].name);
2315 free(tev->args[i].value);
2316 free(tev->args[i].type);
2317 ref = tev->args[i].ref;
2325 memset(tev, 0, sizeof(*tev));
2328 struct kprobe_blacklist_node {
2329 struct list_head list;
2330 unsigned long start;
2335 static void kprobe_blacklist__delete(struct list_head *blacklist)
2337 struct kprobe_blacklist_node *node;
2339 while (!list_empty(blacklist)) {
2340 node = list_first_entry(blacklist,
2341 struct kprobe_blacklist_node, list);
2342 list_del(&node->list);
2348 static int kprobe_blacklist__load(struct list_head *blacklist)
2350 struct kprobe_blacklist_node *node;
2351 const char *__debugfs = debugfs__mountpoint();
2352 char buf[PATH_MAX], *p;
2356 if (__debugfs == NULL)
2359 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2363 fp = fopen(buf, "r");
2368 while (fgets(buf, PATH_MAX, fp)) {
2369 node = zalloc(sizeof(*node));
2374 INIT_LIST_HEAD(&node->list);
2375 list_add_tail(&node->list, blacklist);
2376 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2380 p = strchr(buf, '\t');
2383 if (p[strlen(p) - 1] == '\n')
2384 p[strlen(p) - 1] = '\0';
2386 p = (char *)"unknown";
2387 node->symbol = strdup(p);
2388 if (!node->symbol) {
2392 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2393 node->start, node->end, node->symbol);
2397 kprobe_blacklist__delete(blacklist);
2403 static struct kprobe_blacklist_node *
2404 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2405 unsigned long address)
2407 struct kprobe_blacklist_node *node;
2409 list_for_each_entry(node, blacklist, list) {
2410 if (node->start <= address && address < node->end)
2417 static LIST_HEAD(kprobe_blacklist);
2419 static void kprobe_blacklist__init(void)
2421 if (!list_empty(&kprobe_blacklist))
2424 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2425 pr_debug("No kprobe blacklist support, ignored\n");
2428 static void kprobe_blacklist__release(void)
2430 kprobe_blacklist__delete(&kprobe_blacklist);
2433 static bool kprobe_blacklist__listed(unsigned long address)
2435 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2438 static int perf_probe_event__sprintf(const char *group, const char *event,
2439 struct perf_probe_event *pev,
2441 struct strbuf *result)
2446 if (asprintf(&buf, "%s:%s", group, event) < 0)
2448 ret = strbuf_addf(result, " %-20s (on ", buf);
2453 /* Synthesize only event probe point */
2454 buf = synthesize_perf_probe_point(&pev->point);
2457 ret = strbuf_addstr(result, buf);
2461 ret = strbuf_addf(result, " in %s", module);
2463 if (!ret && pev->nargs > 0) {
2464 ret = strbuf_add(result, " with", 5);
2465 for (i = 0; !ret && i < pev->nargs; i++) {
2466 buf = synthesize_perf_probe_arg(&pev->args[i]);
2469 ret = strbuf_addf(result, " %s", buf);
2474 ret = strbuf_addch(result, ')');
2480 int show_perf_probe_event(const char *group, const char *event,
2481 struct perf_probe_event *pev,
2482 const char *module, bool use_stdout)
2484 struct strbuf buf = STRBUF_INIT;
2487 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2490 printf("%s\n", buf.buf);
2492 pr_info("%s\n", buf.buf);
2494 strbuf_release(&buf);
2499 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2500 struct strfilter *filter)
2504 /* At first, check the event name itself */
2505 if (strfilter__compare(filter, tev->event))
2508 /* Next, check the combination of name and group */
2509 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2511 return strfilter__compare(filter, tmp);
2514 static int __show_perf_probe_events(int fd, bool is_kprobe,
2515 struct strfilter *filter)
2518 struct probe_trace_event tev;
2519 struct perf_probe_event pev;
2520 struct strlist *rawlist;
2521 struct str_node *ent;
2523 memset(&tev, 0, sizeof(tev));
2524 memset(&pev, 0, sizeof(pev));
2526 rawlist = probe_file__get_rawlist(fd);
2530 strlist__for_each_entry(ent, rawlist) {
2531 ret = parse_probe_trace_command(ent->s, &tev);
2533 if (!filter_probe_trace_event(&tev, filter))
2535 ret = convert_to_perf_probe_event(&tev, &pev,
2539 ret = show_perf_probe_event(pev.group, pev.event,
2540 &pev, tev.point.module,
2544 clear_perf_probe_event(&pev);
2545 clear_probe_trace_event(&tev);
2549 strlist__delete(rawlist);
2550 /* Cleanup cached debuginfo if needed */
2551 debuginfo_cache__exit();
2556 /* List up current perf-probe events */
2557 int show_perf_probe_events(struct strfilter *filter)
2559 int kp_fd, up_fd, ret;
2563 if (probe_conf.cache)
2564 return probe_cache__show_all_caches(filter);
2566 ret = init_probe_symbol_maps(false);
2570 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2575 ret = __show_perf_probe_events(kp_fd, true, filter);
2576 if (up_fd >= 0 && ret >= 0)
2577 ret = __show_perf_probe_events(up_fd, false, filter);
2582 exit_probe_symbol_maps();
2587 static int get_new_event_name(char *buf, size_t len, const char *base,
2588 struct strlist *namelist, bool allow_suffix)
2595 nbase = strdup(base);
2599 /* Cut off the dot suffixes (e.g. .const, .isra)*/
2600 p = strchr(nbase, '.');
2601 if (p && p != nbase)
2604 /* Try no suffix number */
2605 ret = e_snprintf(buf, len, "%s", nbase);
2607 pr_debug("snprintf() failed: %d\n", ret);
2610 if (!strlist__has_entry(namelist, buf))
2613 if (!allow_suffix) {
2614 pr_warning("Error: event \"%s\" already exists.\n"
2615 " Hint: Remove existing event by 'perf probe -d'\n"
2616 " or force duplicates by 'perf probe -f'\n"
2617 " or set 'force=yes' in BPF source.\n",
2623 /* Try to add suffix */
2624 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2625 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2627 pr_debug("snprintf() failed: %d\n", ret);
2630 if (!strlist__has_entry(namelist, buf))
2633 if (i == MAX_EVENT_INDEX) {
2634 pr_warning("Too many events are on the same function.\n");
2641 /* Final validation */
2642 if (ret >= 0 && !is_c_func_name(buf)) {
2643 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2651 /* Warn if the current kernel's uprobe implementation is old */
2652 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2655 char *buf = synthesize_probe_trace_command(tev);
2657 /* Old uprobe event doesn't support memory dereference */
2658 if (!tev->uprobes || tev->nargs == 0 || !buf)
2661 for (i = 0; i < tev->nargs; i++)
2662 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2663 pr_warning("Please upgrade your kernel to at least "
2664 "3.14 to have access to feature %s\n",
2665 tev->args[i].value);
2672 /* Set new name from original perf_probe_event and namelist */
2673 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2674 struct perf_probe_event *pev,
2675 struct strlist *namelist,
2678 const char *event, *group;
2682 /* If probe_event or trace_event already have the name, reuse it */
2683 if (pev->event && !pev->sdt)
2685 else if (tev->event)
2688 /* Or generate new one from probe point */
2689 if (pev->point.function &&
2690 (strncmp(pev->point.function, "0x", 2) != 0) &&
2691 !strisglob(pev->point.function))
2692 event = pev->point.function;
2694 event = tev->point.realname;
2696 if (pev->group && !pev->sdt)
2698 else if (tev->group)
2701 group = PERFPROBE_GROUP;
2703 /* Get an unused new event name */
2704 ret = get_new_event_name(buf, 64, event,
2705 namelist, allow_suffix);
2711 tev->event = strdup(event);
2712 tev->group = strdup(group);
2713 if (tev->event == NULL || tev->group == NULL)
2716 /* Add added event name to namelist */
2717 strlist__add(namelist, event);
2721 static int __open_probe_file_and_namelist(bool uprobe,
2722 struct strlist **namelist)
2726 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2730 /* Get current event names */
2731 *namelist = probe_file__get_namelist(fd);
2733 pr_debug("Failed to get current event list.\n");
2740 static int __add_probe_trace_events(struct perf_probe_event *pev,
2741 struct probe_trace_event *tevs,
2742 int ntevs, bool allow_suffix)
2744 int i, fd[2] = {-1, -1}, up, ret;
2745 struct probe_trace_event *tev = NULL;
2746 struct probe_cache *cache = NULL;
2747 struct strlist *namelist[2] = {NULL, NULL};
2748 struct nscookie nsc;
2750 up = pev->uprobes ? 1 : 0;
2751 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2756 for (i = 0; i < ntevs; i++) {
2758 up = tev->uprobes ? 1 : 0;
2759 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2760 fd[up] = __open_probe_file_and_namelist(up,
2765 /* Skip if the symbol is out of .text or blacklisted */
2766 if (!tev->point.symbol && !pev->uprobes)
2769 /* Set new name for tev (and update namelist) */
2770 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2775 nsinfo__mountns_enter(pev->nsi, &nsc);
2776 ret = probe_file__add_event(fd[up], tev);
2777 nsinfo__mountns_exit(&nsc);
2782 * Probes after the first probe which comes from same
2783 * user input are always allowed to add suffix, because
2784 * there might be several addresses corresponding to
2787 allow_suffix = true;
2789 if (ret == -EINVAL && pev->uprobes)
2790 warn_uprobe_event_compat(tev);
2791 if (ret == 0 && probe_conf.cache) {
2792 cache = probe_cache__new(pev->target, pev->nsi);
2794 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2795 probe_cache__commit(cache) < 0)
2796 pr_warning("Failed to add event to probe cache\n");
2797 probe_cache__delete(cache);
2801 for (up = 0; up < 2; up++) {
2802 strlist__delete(namelist[up]);
2809 static int find_probe_functions(struct map *map, char *name,
2810 struct symbol **syms)
2814 struct rb_node *tmp;
2815 const char *norm, *ver;
2818 if (map__load(map) < 0)
2821 map__for_each_symbol(map, sym, tmp) {
2822 norm = arch__normalize_symbol_name(sym->name);
2826 /* We don't care about default symbol or not */
2827 ver = strchr(norm, '@');
2829 buf = strndup(norm, ver - norm);
2834 if (strglobmatch(norm, name)) {
2836 if (syms && found < probe_conf.max_probes)
2837 syms[found - 1] = sym;
2846 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2847 struct probe_trace_event *tev __maybe_unused,
2848 struct map *map __maybe_unused,
2849 struct symbol *sym __maybe_unused) { }
2852 * Find probe function addresses from map.
2853 * Return an error or the number of found probe_trace_event
2855 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2856 struct probe_trace_event **tevs)
2858 struct map *map = NULL;
2859 struct ref_reloc_sym *reloc_sym = NULL;
2861 struct symbol **syms = NULL;
2862 struct probe_trace_event *tev;
2863 struct perf_probe_point *pp = &pev->point;
2864 struct probe_trace_point *tp;
2865 int num_matched_functions;
2866 int ret, i, j, skipped = 0;
2869 map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2875 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2882 * Load matched symbols: Since the different local symbols may have
2883 * same name but different addresses, this lists all the symbols.
2885 num_matched_functions = find_probe_functions(map, pp->function, syms);
2886 if (num_matched_functions <= 0) {
2887 pr_err("Failed to find symbol %s in %s\n", pp->function,
2888 pev->target ? : "kernel");
2891 } else if (num_matched_functions > probe_conf.max_probes) {
2892 pr_err("Too many functions matched in %s\n",
2893 pev->target ? : "kernel");
2898 /* Note that the symbols in the kmodule are not relocated */
2899 if (!pev->uprobes && !pev->target &&
2900 (!pp->retprobe || kretprobe_offset_is_supported())) {
2901 reloc_sym = kernel_get_ref_reloc_sym(NULL);
2903 pr_warning("Relocated base symbol is not found!\n");
2909 /* Setup result trace-probe-events */
2910 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2918 for (j = 0; j < num_matched_functions; j++) {
2921 tev = (*tevs) + ret;
2923 if (ret == num_matched_functions) {
2924 pr_warning("Too many symbols are listed. Skip it.\n");
2929 if (pp->offset > sym->end - sym->start) {
2930 pr_warning("Offset %ld is bigger than the size of %s\n",
2931 pp->offset, sym->name);
2935 /* Add one probe point */
2936 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2938 /* Check the kprobe (not in module) is within .text */
2939 if (!pev->uprobes && !pev->target &&
2940 kprobe_warn_out_range(sym->name, tp->address)) {
2941 tp->symbol = NULL; /* Skip it */
2943 } else if (reloc_sym) {
2944 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2945 tp->offset = tp->address - reloc_sym->addr;
2947 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2948 tp->offset = pp->offset;
2950 tp->realname = strdup_or_goto(sym->name, nomem_out);
2952 tp->retprobe = pp->retprobe;
2955 tev->point.module = strdup_or_goto(pev->target,
2958 mod_name = find_module_name(pev->target);
2960 strdup(mod_name ? mod_name : pev->target);
2962 if (!tev->point.module)
2966 tev->uprobes = pev->uprobes;
2967 tev->nargs = pev->nargs;
2969 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2971 if (tev->args == NULL)
2974 for (i = 0; i < tev->nargs; i++) {
2975 if (pev->args[i].name)
2977 strdup_or_goto(pev->args[i].name,
2980 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2982 if (pev->args[i].type)
2984 strdup_or_goto(pev->args[i].type,
2987 arch__fix_tev_from_maps(pev, tev, map, sym);
2989 if (ret == skipped) {
3002 clear_probe_trace_events(*tevs, num_matched_functions);
3007 static int try_to_find_absolute_address(struct perf_probe_event *pev,
3008 struct probe_trace_event **tevs)
3010 struct perf_probe_point *pp = &pev->point;
3011 struct probe_trace_event *tev;
3012 struct probe_trace_point *tp;
3015 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3017 if (perf_probe_event_need_dwarf(pev))
3021 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3024 * Only one tev can be generated by this.
3026 *tevs = zalloc(sizeof(*tev));
3034 * Don't use tp->offset, use address directly, because
3035 * in synthesize_probe_trace_command() address cannot be
3038 tp->address = pev->point.abs_address;
3039 tp->retprobe = pp->retprobe;
3040 tev->uprobes = pev->uprobes;
3044 * Give it a '0x' leading symbol name.
3045 * In __add_probe_trace_events, a NULL symbol is interpreted as
3048 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3051 /* For kprobe, check range */
3052 if ((!tev->uprobes) &&
3053 (kprobe_warn_out_range(tev->point.symbol,
3054 tev->point.address))) {
3059 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3063 tp->module = strdup(pev->target);
3069 tev->group = strdup(pev->group);
3075 tev->event = strdup(pev->event);
3080 tev->nargs = pev->nargs;
3081 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3085 for (i = 0; i < tev->nargs; i++)
3086 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3091 clear_probe_trace_events(*tevs, 1);
3096 /* Concatinate two arrays */
3097 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3101 ret = malloc(sz_a + sz_b);
3103 memcpy(ret, a, sz_a);
3104 memcpy(ret + sz_a, b, sz_b);
3110 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3111 struct probe_trace_event **tevs2, int ntevs2)
3113 struct probe_trace_event *new_tevs;
3123 if (*ntevs + ntevs2 > probe_conf.max_probes)
3126 /* Concatinate the array of probe_trace_event */
3127 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3128 *tevs2, ntevs2 * sizeof(**tevs2));
3138 clear_probe_trace_events(*tevs2, ntevs2);
3145 * Try to find probe_trace_event from given probe caches. Return the number
3146 * of cached events found, if an error occurs return the error.
3148 static int find_cached_events(struct perf_probe_event *pev,
3149 struct probe_trace_event **tevs,
3152 struct probe_cache *cache;
3153 struct probe_cache_entry *entry;
3154 struct probe_trace_event *tmp_tevs = NULL;
3158 cache = probe_cache__new(target, pev->nsi);
3159 /* Return 0 ("not found") if the target has no probe cache. */
3163 for_each_probe_cache_entry(entry, cache) {
3164 /* Skip the cache entry which has no name */
3165 if (!entry->pev.event || !entry->pev.group)
3167 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3168 strglobmatch(entry->pev.event, pev->event)) {
3169 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3171 ret = concat_probe_trace_events(tevs, &ntevs,
3177 probe_cache__delete(cache);
3179 clear_probe_trace_events(*tevs, ntevs);
3183 if (ntevs > 0 && target && target[0] == '/')
3184 pev->uprobes = true;
3190 /* Try to find probe_trace_event from all probe caches */
3191 static int find_cached_events_all(struct perf_probe_event *pev,
3192 struct probe_trace_event **tevs)
3194 struct probe_trace_event *tmp_tevs = NULL;
3195 struct strlist *bidlist;
3196 struct str_node *nd;
3201 /* Get the buildid list of all valid caches */
3202 bidlist = build_id_cache__list_all(true);
3205 pr_debug("Failed to get buildids: %d\n", ret);
3210 strlist__for_each_entry(nd, bidlist) {
3211 pathname = build_id_cache__origname(nd->s);
3212 ret = find_cached_events(pev, &tmp_tevs, pathname);
3213 /* In the case of cnt == 0, we just skip it */
3215 ret = concat_probe_trace_events(tevs, &ntevs,
3221 strlist__delete(bidlist);
3224 clear_probe_trace_events(*tevs, ntevs);
3232 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3233 struct probe_trace_event **tevs)
3235 struct probe_cache *cache;
3236 struct probe_cache_entry *entry;
3237 struct probe_trace_event *tev;
3238 struct str_node *node;
3242 /* For SDT/cached events, we use special search functions */
3244 return find_cached_events_all(pev, tevs);
3246 return find_cached_events(pev, tevs, pev->target);
3248 cache = probe_cache__new(pev->target, pev->nsi);
3252 entry = probe_cache__find(cache, pev);
3254 /* SDT must be in the cache */
3255 ret = pev->sdt ? -ENOENT : 0;
3259 ret = strlist__nr_entries(entry->tevlist);
3260 if (ret > probe_conf.max_probes) {
3261 pr_debug("Too many entries matched in the cache of %s\n",
3262 pev->target ? : "kernel");
3267 *tevs = zalloc(ret * sizeof(*tev));
3274 strlist__for_each_entry(node, entry->tevlist) {
3275 tev = &(*tevs)[i++];
3276 ret = parse_probe_trace_command(node->s, tev);
3279 /* Set the uprobes attribute as same as original */
3280 tev->uprobes = pev->uprobes;
3285 probe_cache__delete(cache);
3289 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3290 struct probe_trace_event **tevs)
3294 if (!pev->group && !pev->sdt) {
3295 /* Set group name if not given */
3296 if (!pev->uprobes) {
3297 pev->group = strdup(PERFPROBE_GROUP);
3298 ret = pev->group ? 0 : -ENOMEM;
3300 ret = convert_exec_to_group(pev->target, &pev->group);
3302 pr_warning("Failed to make a group name.\n");
3307 ret = try_to_find_absolute_address(pev, tevs);
3311 /* At first, we need to lookup cache entry */
3312 ret = find_probe_trace_events_from_cache(pev, tevs);
3313 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3314 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3316 /* Convert perf_probe_event with debuginfo */
3317 ret = try_to_find_probe_trace_events(pev, tevs);
3319 return ret; /* Found in debuginfo or got an error */
3321 return find_probe_trace_events_from_map(pev, tevs);
3324 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3328 /* Loop 1: convert all events */
3329 for (i = 0; i < npevs; i++) {
3330 /* Init kprobe blacklist if needed */
3331 if (!pevs[i].uprobes)
3332 kprobe_blacklist__init();
3333 /* Convert with or without debuginfo */
3334 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3337 pevs[i].ntevs = ret;
3339 /* This just release blacklist only if allocated */
3340 kprobe_blacklist__release();
3345 static int show_probe_trace_event(struct probe_trace_event *tev)
3347 char *buf = synthesize_probe_trace_command(tev);
3350 pr_debug("Failed to synthesize probe trace event.\n");
3354 /* Showing definition always go stdout */
3355 printf("%s\n", buf);
3361 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3363 struct strlist *namelist = strlist__new(NULL, NULL);
3364 struct probe_trace_event *tev;
3365 struct perf_probe_event *pev;
3371 for (j = 0; j < npevs && !ret; j++) {
3373 for (i = 0; i < pev->ntevs && !ret; i++) {
3374 tev = &pev->tevs[i];
3375 /* Skip if the symbol is out of .text or blacklisted */
3376 if (!tev->point.symbol && !pev->uprobes)
3379 /* Set new name for tev (and update namelist) */
3380 ret = probe_trace_event__set_name(tev, pev,
3383 ret = show_probe_trace_event(tev);
3386 strlist__delete(namelist);
3391 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3395 /* Loop 2: add all events */
3396 for (i = 0; i < npevs; i++) {
3397 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3399 probe_conf.force_add);
3406 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3409 struct perf_probe_event *pev;
3411 /* Loop 3: cleanup and free trace events */
3412 for (i = 0; i < npevs; i++) {
3414 for (j = 0; j < pevs[i].ntevs; j++)
3415 clear_probe_trace_event(&pevs[i].tevs[j]);
3416 zfree(&pevs[i].tevs);
3418 nsinfo__zput(pev->nsi);
3419 clear_perf_probe_event(&pevs[i]);
3423 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3427 ret = init_probe_symbol_maps(pevs->uprobes);
3431 ret = convert_perf_probe_events(pevs, npevs);
3433 ret = apply_perf_probe_events(pevs, npevs);
3435 cleanup_perf_probe_events(pevs, npevs);
3437 exit_probe_symbol_maps();
3441 int del_perf_probe_events(struct strfilter *filter)
3443 int ret, ret2, ufd = -1, kfd = -1;
3444 char *str = strfilter__string(filter);
3449 /* Get current event names */
3450 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3454 ret = probe_file__del_events(kfd, filter);
3455 if (ret < 0 && ret != -ENOENT)
3458 ret2 = probe_file__del_events(ufd, filter);
3459 if (ret2 < 0 && ret2 != -ENOENT) {
3476 int show_available_funcs(const char *target, struct nsinfo *nsi,
3477 struct strfilter *_filter, bool user)
3483 ret = init_probe_symbol_maps(user);
3487 /* Get a symbol map */
3488 map = get_target_map(target, nsi, user);
3490 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3494 ret = map__load(map);
3497 char *str = strfilter__string(_filter);
3498 pr_err("Failed to find symbols matched to \"%s\"\n",
3502 pr_err("Failed to load symbols in %s\n",
3503 (target) ? : "kernel");
3506 if (!dso__sorted_by_name(map->dso, map->type))
3507 dso__sort_by_name(map->dso, map->type);
3509 /* Show all (filtered) symbols */
3512 for (nd = rb_first(&map->dso->symbol_names[map->type]); nd; nd = rb_next(nd)) {
3513 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3515 if (strfilter__compare(_filter, pos->sym.name))
3516 printf("%s\n", pos->sym.name);
3521 exit_probe_symbol_maps();
3526 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3527 struct perf_probe_arg *pvar)
3529 tvar->value = strdup(pvar->var);
3530 if (tvar->value == NULL)
3533 tvar->type = strdup(pvar->type);
3534 if (tvar->type == NULL)
3538 tvar->name = strdup(pvar->name);
3539 if (tvar->name == NULL)