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.
22 #include <sys/utsname.h>
23 #include <sys/types.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"
50 #define MAX_CMDLEN 256
51 #define PERFPROBE_GROUP "probe"
53 bool probe_event_dry_run; /* Dry run flag */
54 struct probe_conf probe_conf;
56 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
58 int e_snprintf(char *str, size_t size, const char *format, ...)
63 ret = vsnprintf(str, size, format, ap);
70 static struct machine *host_machine;
72 /* Initialize symbol maps and path of vmlinux/modules */
73 int init_probe_symbol_maps(bool user_only)
77 symbol_conf.sort_by_name = true;
78 symbol_conf.allow_aliases = true;
79 ret = symbol__init(NULL);
81 pr_debug("Failed to init symbol map.\n");
85 if (host_machine || user_only) /* already initialized */
88 if (symbol_conf.vmlinux_name)
89 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
91 host_machine = machine__new_host();
93 pr_debug("machine__new_host() failed.\n");
99 pr_warning("Failed to init vmlinux path.\n");
103 void exit_probe_symbol_maps(void)
105 machine__delete(host_machine);
110 static struct symbol *__find_kernel_function_by_name(const char *name,
113 return machine__find_kernel_function_by_name(host_machine, name, mapp,
117 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
119 return machine__find_kernel_function(host_machine, addr, mapp, NULL);
122 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
124 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
126 struct map *map = machine__kernel_map(host_machine);
128 if (map__load(map, NULL) < 0)
131 kmap = map__kmap(map);
134 return kmap->ref_reloc_sym;
137 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
138 bool reloc, bool reladdr)
140 struct ref_reloc_sym *reloc_sym;
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;
149 sym = __find_kernel_function_by_name(name, &map);
152 *addr = map->unmap_ip(map, sym->start) -
153 ((reloc) ? 0 : map->reloc) -
154 ((reladdr) ? map->start : 0);
159 static struct map *kernel_get_module_map(const char *module)
161 struct map_groups *grp = &host_machine->kmaps;
162 struct maps *maps = &grp->maps[MAP__FUNCTION];
165 /* A file path -- this is an offline module */
166 if (module && strchr(module, '/'))
167 return machine__findnew_module_map(host_machine, 0, module);
172 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
173 if (strncmp(pos->dso->short_name + 1, module,
174 pos->dso->short_name_len - 2) == 0) {
181 static struct map *get_target_map(const char *target, bool user)
183 /* Init maps of given executable or kernel */
185 return dso__new_map(target);
187 return kernel_get_module_map(target);
190 static void put_target_map(struct map *map, bool user)
193 /* Only the user map needs to be released */
199 static int convert_exec_to_group(const char *exec, char **result)
201 char *ptr1, *ptr2, *exec_copy;
205 exec_copy = strdup(exec);
209 ptr1 = basename(exec_copy);
215 ptr2 = strpbrk(ptr1, "-._");
218 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
222 *result = strdup(buf);
223 ret = *result ? 0 : -ENOMEM;
230 static void clear_perf_probe_point(struct perf_probe_point *pp)
237 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
241 for (i = 0; i < ntevs; i++)
242 clear_probe_trace_event(tevs + i);
245 static bool kprobe_blacklist__listed(unsigned long address);
246 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
251 /* Get the address of _etext for checking non-probable text symbol */
252 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
255 if (ret == 0 && etext_addr < address)
256 pr_warning("%s is out of .text, skip it.\n", symbol);
257 else if (kprobe_blacklist__listed(address))
258 pr_warning("%s is blacklisted function, skip it.\n", symbol);
267 * '.gnu.linkonce.this_module' section of kernel module elf directly
268 * maps to 'struct module' from linux/module.h. This section contains
269 * actual module name which will be used by kernel after loading it.
270 * But, we cannot use 'struct module' here since linux/module.h is not
271 * exposed to user-space. Offset of 'name' has remained same from long
272 * time, so hardcoding it here.
275 #define MOD_NAME_OFFSET 24
277 #define MOD_NAME_OFFSET 12
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;
295 fd = open(module, O_RDONLY);
299 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
303 if (gelf_getehdr(elf, &ehdr) == NULL)
306 sec = elf_section_by_name(elf, &ehdr, &shdr,
307 ".gnu.linkonce.this_module", NULL);
311 data = elf_getdata(sec, NULL);
312 if (!data || !data->d_buf)
315 mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET);
324 #ifdef HAVE_DWARF_SUPPORT
326 static int kernel_get_module_dso(const char *module, struct dso **pdso)
330 const char *vmlinux_name;
334 char module_name[128];
336 snprintf(module_name, sizeof(module_name), "[%s]", module);
337 map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name);
342 pr_debug("Failed to find module %s.\n", module);
346 map = machine__kernel_map(host_machine);
349 vmlinux_name = symbol_conf.vmlinux_name;
352 ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
354 ret = dso__load_vmlinux_path(dso, map, NULL);
361 * Some binaries like glibc have special symbols which are on the symbol
362 * table, but not in the debuginfo. If we can find the address of the
363 * symbol from map, we can translate the address back to the probe point.
365 static int find_alternative_probe_point(struct debuginfo *dinfo,
366 struct perf_probe_point *pp,
367 struct perf_probe_point *result,
368 const char *target, bool uprobes)
370 struct map *map = NULL;
375 /* This can work only for function-name based one */
376 if (!pp->function || pp->file)
379 map = get_target_map(target, uprobes);
383 /* Find the address of given function */
384 map__for_each_symbol_by_name(map, pp->function, sym) {
386 address = sym->start;
388 address = map->unmap_ip(map, sym->start);
395 pr_debug("Symbol %s address found : %" PRIx64 "\n",
396 pp->function, address);
398 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
401 ret = (!ret) ? -ENOENT : ret;
403 result->offset += pp->offset;
404 result->line += pp->line;
405 result->retprobe = pp->retprobe;
410 put_target_map(map, uprobes);
415 static int get_alternative_probe_event(struct debuginfo *dinfo,
416 struct perf_probe_event *pev,
417 struct perf_probe_point *tmp)
421 memcpy(tmp, &pev->point, sizeof(*tmp));
422 memset(&pev->point, 0, sizeof(pev->point));
423 ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
424 pev->target, pev->uprobes);
426 memcpy(&pev->point, tmp, sizeof(*tmp));
431 static int get_alternative_line_range(struct debuginfo *dinfo,
432 struct line_range *lr,
433 const char *target, bool user)
435 struct perf_probe_point pp = { .function = lr->function,
438 struct perf_probe_point result;
441 memset(&result, 0, sizeof(result));
443 if (lr->end != INT_MAX)
444 len = lr->end - lr->start;
445 ret = find_alternative_probe_point(dinfo, &pp, &result,
448 lr->function = result.function;
449 lr->file = result.file;
450 lr->start = result.line;
451 if (lr->end != INT_MAX)
452 lr->end = lr->start + len;
453 clear_perf_probe_point(&pp);
458 /* Open new debuginfo of given module */
459 static struct debuginfo *open_debuginfo(const char *module, bool silent)
461 const char *path = module;
462 char reason[STRERR_BUFSIZE];
463 struct debuginfo *ret = NULL;
464 struct dso *dso = NULL;
467 if (!module || !strchr(module, '/')) {
468 err = kernel_get_module_dso(module, &dso);
470 if (!dso || dso->load_errno == 0) {
471 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
472 strcpy(reason, "(unknown)");
474 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
476 pr_err("Failed to find the path for %s: %s\n",
477 module ?: "kernel", reason);
480 path = dso->long_name;
482 ret = debuginfo__new(path);
483 if (!ret && !silent) {
484 pr_warning("The %s file has no debug information.\n", path);
485 if (!module || !strtailcmp(path, ".ko"))
486 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
488 pr_warning("Rebuild with -g, ");
489 pr_warning("or install an appropriate debuginfo package.\n");
494 /* For caching the last debuginfo */
495 static struct debuginfo *debuginfo_cache;
496 static char *debuginfo_cache_path;
498 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
500 const char *path = module;
502 /* If the module is NULL, it should be the kernel. */
506 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
509 /* Copy module path */
510 free(debuginfo_cache_path);
511 debuginfo_cache_path = strdup(path);
512 if (!debuginfo_cache_path) {
513 debuginfo__delete(debuginfo_cache);
514 debuginfo_cache = NULL;
518 debuginfo_cache = open_debuginfo(module, silent);
519 if (!debuginfo_cache)
520 zfree(&debuginfo_cache_path);
522 return debuginfo_cache;
525 static void debuginfo_cache__exit(void)
527 debuginfo__delete(debuginfo_cache);
528 debuginfo_cache = NULL;
529 zfree(&debuginfo_cache_path);
533 static int get_text_start_address(const char *exec, unsigned long *address)
538 int fd, ret = -ENOENT;
540 fd = open(exec, O_RDONLY);
544 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
550 if (gelf_getehdr(elf, &ehdr) == NULL)
553 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
556 *address = shdr.sh_addr - shdr.sh_offset;
567 * Convert trace point to probe point with debuginfo
569 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
570 struct perf_probe_point *pp,
573 struct debuginfo *dinfo = NULL;
574 unsigned long stext = 0;
575 u64 addr = tp->address;
578 /* convert the address to dwarf address */
584 ret = get_text_start_address(tp->module, &stext);
588 } else if (tp->symbol) {
589 /* If the module is given, this returns relative address */
590 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
591 false, !!tp->module);
597 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
598 tp->module ? : "kernel");
600 dinfo = debuginfo_cache__open(tp->module, verbose == 0);
602 ret = debuginfo__find_probe_point(dinfo,
603 (unsigned long)addr, pp);
608 pp->retprobe = tp->retprobe;
612 pr_debug("Failed to find corresponding probes from debuginfo.\n");
613 return ret ? : -ENOENT;
616 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
617 int ntevs, const char *exec)
620 unsigned long stext = 0;
625 ret = get_text_start_address(exec, &stext);
629 for (i = 0; i < ntevs && ret >= 0; i++) {
630 /* point.address is the addres of point.symbol + point.offset */
631 tevs[i].point.address -= stext;
632 tevs[i].point.module = strdup(exec);
633 if (!tevs[i].point.module) {
637 tevs[i].uprobes = true;
643 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
644 int ntevs, const char *module)
647 char *mod_name = NULL;
652 mod_name = find_module_name(module);
654 for (i = 0; i < ntevs; i++) {
655 tevs[i].point.module =
656 strdup(mod_name ? mod_name : module);
657 if (!tevs[i].point.module) {
667 /* Post processing the probe events */
668 static int post_process_probe_trace_events(struct probe_trace_event *tevs,
669 int ntevs, const char *module,
672 struct ref_reloc_sym *reloc_sym;
677 return add_exec_to_probe_trace_events(tevs, ntevs, module);
679 /* Note that currently ref_reloc_sym based probe is not for drivers */
681 return add_module_to_probe_trace_events(tevs, ntevs, module);
683 reloc_sym = kernel_get_ref_reloc_sym();
685 pr_warning("Relocated base symbol is not found!\n");
689 for (i = 0; i < ntevs; i++) {
690 if (!tevs[i].point.address || tevs[i].point.retprobe)
692 /* If we found a wrong one, mark it by NULL symbol */
693 if (kprobe_warn_out_range(tevs[i].point.symbol,
694 tevs[i].point.address)) {
698 tmp = strdup(reloc_sym->name);
702 /* If we have no realname, use symbol for it */
703 if (!tevs[i].point.realname)
704 tevs[i].point.realname = tevs[i].point.symbol;
706 free(tevs[i].point.symbol);
707 tevs[i].point.symbol = tmp;
708 tevs[i].point.offset = tevs[i].point.address -
709 reloc_sym->unrelocated_addr;
714 /* Try to find perf_probe_event with debuginfo */
715 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
716 struct probe_trace_event **tevs)
718 bool need_dwarf = perf_probe_event_need_dwarf(pev);
719 struct perf_probe_point tmp;
720 struct debuginfo *dinfo;
723 dinfo = open_debuginfo(pev->target, !need_dwarf);
727 pr_debug("Could not open debuginfo. Try to use symbols.\n");
731 pr_debug("Try to find probe point from debuginfo.\n");
732 /* Searching trace events corresponding to a probe event */
733 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
735 if (ntevs == 0) { /* Not found, retry with an alternative */
736 ret = get_alternative_probe_event(dinfo, pev, &tmp);
738 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
740 * Write back to the original probe_event for
741 * setting appropriate (user given) event name
743 clear_perf_probe_point(&pev->point);
744 memcpy(&pev->point, &tmp, sizeof(tmp));
748 debuginfo__delete(dinfo);
750 if (ntevs > 0) { /* Succeeded to find trace events */
751 pr_debug("Found %d probe_trace_events.\n", ntevs);
752 ret = post_process_probe_trace_events(*tevs, ntevs,
753 pev->target, pev->uprobes);
754 if (ret < 0 || ret == ntevs) {
755 clear_probe_trace_events(*tevs, ntevs);
759 return ret < 0 ? ret : ntevs;
764 if (ntevs == 0) { /* No error but failed to find probe point. */
765 pr_warning("Probe point '%s' not found.\n",
766 synthesize_perf_probe_point(&pev->point));
769 /* Error path : ntevs < 0 */
770 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
773 pr_warning("Warning: No dwarf info found in the vmlinux - "
774 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
776 pr_debug("Trying to use symbols.\n");
783 #define LINEBUF_SIZE 256
784 #define NR_ADDITIONAL_LINES 2
786 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
788 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
789 const char *color = show_num ? "" : PERF_COLOR_BLUE;
790 const char *prefix = NULL;
793 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
798 prefix = show_num ? "%7d " : " ";
799 color_fprintf(stdout, color, prefix, l);
801 color_fprintf(stdout, color, "%s", buf);
803 } while (strchr(buf, '\n') == NULL);
808 pr_warning("File read error: %s\n",
809 str_error_r(errno, sbuf, sizeof(sbuf)));
815 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
817 int rv = __show_one_line(fp, l, skip, show_num);
819 pr_warning("Source file is shorter than expected.\n");
825 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
826 #define show_one_line(f,l) _show_one_line(f,l,false,false)
827 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
828 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
831 * Show line-range always requires debuginfo to find source file and
834 static int __show_line_range(struct line_range *lr, const char *module,
839 struct debuginfo *dinfo;
843 char sbuf[STRERR_BUFSIZE];
845 /* Search a line range */
846 dinfo = open_debuginfo(module, false);
850 ret = debuginfo__find_line_range(dinfo, lr);
851 if (!ret) { /* Not found, retry with an alternative */
852 ret = get_alternative_line_range(dinfo, lr, module, user);
854 ret = debuginfo__find_line_range(dinfo, lr);
856 debuginfo__delete(dinfo);
857 if (ret == 0 || ret == -ENOENT) {
858 pr_warning("Specified source line is not found.\n");
860 } else if (ret < 0) {
861 pr_warning("Debuginfo analysis failed.\n");
865 /* Convert source file path */
867 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
869 /* Free old path when new path is assigned */
874 pr_warning("Failed to find source file path.\n");
881 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
882 lr->start - lr->offset);
884 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
886 fp = fopen(lr->path, "r");
888 pr_warning("Failed to open %s: %s\n", lr->path,
889 str_error_r(errno, sbuf, sizeof(sbuf)));
892 /* Skip to starting line number */
893 while (l < lr->start) {
894 ret = skip_one_line(fp, l++);
899 intlist__for_each_entry(ln, lr->line_list) {
900 for (; ln->i > l; l++) {
901 ret = show_one_line(fp, l - lr->offset);
905 ret = show_one_line_with_num(fp, l++ - lr->offset);
910 if (lr->end == INT_MAX)
911 lr->end = l + NR_ADDITIONAL_LINES;
912 while (l <= lr->end) {
913 ret = show_one_line_or_eof(fp, l++ - lr->offset);
922 int show_line_range(struct line_range *lr, const char *module, bool user)
926 ret = init_probe_symbol_maps(user);
929 ret = __show_line_range(lr, module, user);
930 exit_probe_symbol_maps();
935 static int show_available_vars_at(struct debuginfo *dinfo,
936 struct perf_probe_event *pev,
937 struct strfilter *_filter)
941 struct str_node *node;
942 struct variable_list *vls = NULL, *vl;
943 struct perf_probe_point tmp;
946 buf = synthesize_perf_probe_point(&pev->point);
949 pr_debug("Searching variables at %s\n", buf);
951 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
952 if (!ret) { /* Not found, retry with an alternative */
953 ret = get_alternative_probe_event(dinfo, pev, &tmp);
955 ret = debuginfo__find_available_vars_at(dinfo, pev,
957 /* Release the old probe_point */
958 clear_perf_probe_point(&tmp);
962 if (ret == 0 || ret == -ENOENT) {
963 pr_err("Failed to find the address of %s\n", buf);
966 pr_warning("Debuginfo analysis failed.\n");
970 /* Some variables are found */
971 fprintf(stdout, "Available variables at %s\n", buf);
972 for (i = 0; i < ret; i++) {
975 * A probe point might be converted to
976 * several trace points.
978 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
980 zfree(&vl->point.symbol);
983 strlist__for_each_entry(node, vl->vars) {
984 var = strchr(node->s, '\t') + 1;
985 if (strfilter__compare(_filter, var)) {
986 fprintf(stdout, "\t\t%s\n", node->s);
990 strlist__delete(vl->vars);
993 fprintf(stdout, "\t\t(No matched variables)\n");
1001 /* Show available variables on given probe point */
1002 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1003 struct strfilter *_filter)
1006 struct debuginfo *dinfo;
1008 ret = init_probe_symbol_maps(pevs->uprobes);
1012 dinfo = open_debuginfo(pevs->target, false);
1020 for (i = 0; i < npevs && ret >= 0; i++)
1021 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1023 debuginfo__delete(dinfo);
1025 exit_probe_symbol_maps();
1029 #else /* !HAVE_DWARF_SUPPORT */
1031 static void debuginfo_cache__exit(void)
1036 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1037 struct perf_probe_point *pp __maybe_unused,
1038 bool is_kprobe __maybe_unused)
1043 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1044 struct probe_trace_event **tevs __maybe_unused)
1046 if (perf_probe_event_need_dwarf(pev)) {
1047 pr_warning("Debuginfo-analysis is not supported.\n");
1054 int show_line_range(struct line_range *lr __maybe_unused,
1055 const char *module __maybe_unused,
1056 bool user __maybe_unused)
1058 pr_warning("Debuginfo-analysis is not supported.\n");
1062 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1063 int npevs __maybe_unused,
1064 struct strfilter *filter __maybe_unused)
1066 pr_warning("Debuginfo-analysis is not supported.\n");
1071 void line_range__clear(struct line_range *lr)
1077 intlist__delete(lr->line_list);
1078 memset(lr, 0, sizeof(*lr));
1081 int line_range__init(struct line_range *lr)
1083 memset(lr, 0, sizeof(*lr));
1084 lr->line_list = intlist__new(NULL);
1091 static int parse_line_num(char **ptr, int *val, const char *what)
1093 const char *start = *ptr;
1096 *val = strtol(*ptr, ptr, 0);
1097 if (errno || *ptr == start) {
1098 semantic_error("'%s' is not a valid number.\n", what);
1104 /* Check the name is good for event, group or function */
1105 static bool is_c_func_name(const char *name)
1107 if (!isalpha(*name) && *name != '_')
1109 while (*++name != '\0') {
1110 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1117 * Stuff 'lr' according to the line range described by 'arg'.
1118 * The line range syntax is described by:
1120 * SRC[:SLN[+NUM|-ELN]]
1121 * FNC[@SRC][:SLN[+NUM|-ELN]]
1123 int parse_line_range_desc(const char *arg, struct line_range *lr)
1125 char *range, *file, *name = strdup(arg);
1134 range = strchr(name, ':');
1138 err = parse_line_num(&range, &lr->start, "start line");
1142 if (*range == '+' || *range == '-') {
1143 const char c = *range++;
1145 err = parse_line_num(&range, &lr->end, "end line");
1150 lr->end += lr->start;
1152 * Adjust the number of lines here.
1153 * If the number of lines == 1, the
1154 * the end of line should be equal to
1155 * the start of line.
1161 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1164 if (lr->start > lr->end) {
1165 semantic_error("Start line must be smaller"
1166 " than end line.\n");
1169 if (*range != '\0') {
1170 semantic_error("Tailing with invalid str '%s'.\n", range);
1175 file = strchr(name, '@');
1178 lr->file = strdup(++file);
1179 if (lr->file == NULL) {
1183 lr->function = name;
1184 } else if (strchr(name, '/') || strchr(name, '.'))
1186 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1187 lr->function = name;
1188 else { /* Invalid name */
1189 semantic_error("'%s' is not a valid function name.\n", name);
1200 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1204 ptr = strchr(*arg, ':');
1207 if (!pev->sdt && !is_c_func_name(*arg))
1209 pev->group = strdup(*arg);
1215 if (!pev->sdt && !is_c_func_name(*arg)) {
1217 semantic_error("%s is bad for event name -it must "
1218 "follow C symbol-naming rule.\n", *arg);
1221 pev->event = strdup(*arg);
1222 if (pev->event == NULL)
1228 /* Parse probepoint definition. */
1229 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1231 struct perf_probe_point *pp = &pev->point;
1234 bool file_spec = false;
1239 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1240 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1241 * perf probe %[GRP:]SDT_EVENT
1246 if (arg[0] == '%') {
1251 ptr = strpbrk(arg, ";=@+%");
1254 semantic_error("%s must contain only an SDT event name.\n", arg);
1257 ret = parse_perf_probe_event_name(&arg, pev);
1259 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1265 if (ptr && *ptr == '=') { /* Event name */
1268 ret = parse_perf_probe_event_name(&arg, pev);
1276 * Check arg is function or file name and copy it.
1278 * We consider arg to be a file spec if and only if it satisfies
1279 * all of the below criteria::
1280 * - it does not include any of "+@%",
1281 * - it includes one of ":;", and
1282 * - it has a period '.' in the name.
1284 * Otherwise, we consider arg to be a function specification.
1286 if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
1287 /* This is a file spec if it includes a '.' before ; or : */
1288 if (memchr(arg, '.', ptr - arg))
1292 ptr = strpbrk(arg, ";:+@%");
1312 * Keep pp->function even if this is absolute address,
1313 * so it can mark whether abs_address is valid.
1314 * Which make 'perf probe lib.bin 0x0' possible.
1316 * Note that checking length of tmp is not needed
1317 * because when we access tmp[1] we know tmp[0] is '0',
1318 * so tmp[1] should always valid (but could be '\0').
1320 if (tmp && !strncmp(tmp, "0x", 2)) {
1321 pp->abs_address = strtoul(pp->function, &tmp, 0);
1323 semantic_error("Invalid absolute address.\n");
1329 /* Parse other options */
1333 if (c == ';') { /* Lazy pattern must be the last part */
1334 pp->lazy_line = strdup(arg);
1335 if (pp->lazy_line == NULL)
1339 ptr = strpbrk(arg, ";:+@%");
1345 case ':': /* Line number */
1346 pp->line = strtoul(arg, &tmp, 0);
1348 semantic_error("There is non-digit char"
1349 " in line number.\n");
1353 case '+': /* Byte offset from a symbol */
1354 pp->offset = strtoul(arg, &tmp, 0);
1356 semantic_error("There is non-digit character"
1361 case '@': /* File name */
1363 semantic_error("SRC@SRC is not allowed.\n");
1366 pp->file = strdup(arg);
1367 if (pp->file == NULL)
1370 case '%': /* Probe places */
1371 if (strcmp(arg, "return") == 0) {
1373 } else { /* Others not supported yet */
1374 semantic_error("%%%s is not supported.\n", arg);
1378 default: /* Buggy case */
1379 pr_err("This program has a bug at %s:%d.\n",
1380 __FILE__, __LINE__);
1386 /* Exclusion check */
1387 if (pp->lazy_line && pp->line) {
1388 semantic_error("Lazy pattern can't be used with"
1393 if (pp->lazy_line && pp->offset) {
1394 semantic_error("Lazy pattern can't be used with offset.\n");
1398 if (pp->line && pp->offset) {
1399 semantic_error("Offset can't be used with line number.\n");
1403 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1404 semantic_error("File always requires line number or "
1409 if (pp->offset && !pp->function) {
1410 semantic_error("Offset requires an entry function.\n");
1414 if (pp->retprobe && !pp->function) {
1415 semantic_error("Return probe requires an entry function.\n");
1419 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1420 semantic_error("Offset/Line/Lazy pattern can't be used with "
1425 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1426 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1431 /* Parse perf-probe event argument */
1432 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1434 char *tmp, *goodname;
1435 struct perf_probe_arg_field **fieldp;
1437 pr_debug("parsing arg: %s into ", str);
1439 tmp = strchr(str, '=');
1441 arg->name = strndup(str, tmp - str);
1442 if (arg->name == NULL)
1444 pr_debug("name:%s ", arg->name);
1448 tmp = strchr(str, ':');
1449 if (tmp) { /* Type setting */
1451 arg->type = strdup(tmp + 1);
1452 if (arg->type == NULL)
1454 pr_debug("type:%s ", arg->type);
1457 tmp = strpbrk(str, "-.[");
1458 if (!is_c_varname(str) || !tmp) {
1459 /* A variable, register, symbol or special value */
1460 arg->var = strdup(str);
1461 if (arg->var == NULL)
1463 pr_debug("%s\n", arg->var);
1467 /* Structure fields or array element */
1468 arg->var = strndup(str, tmp - str);
1469 if (arg->var == NULL)
1471 goodname = arg->var;
1472 pr_debug("%s, ", arg->var);
1473 fieldp = &arg->field;
1476 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1477 if (*fieldp == NULL)
1479 if (*tmp == '[') { /* Array */
1481 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1482 (*fieldp)->ref = true;
1483 if (*tmp != ']' || tmp == str + 1) {
1484 semantic_error("Array index must be a"
1491 } else { /* Structure */
1494 (*fieldp)->ref = false;
1495 } else if (tmp[1] == '>') {
1497 (*fieldp)->ref = true;
1499 semantic_error("Argument parse error: %s\n",
1503 tmp = strpbrk(str, "-.[");
1506 (*fieldp)->name = strndup(str, tmp - str);
1507 if ((*fieldp)->name == NULL)
1510 goodname = (*fieldp)->name;
1511 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1512 fieldp = &(*fieldp)->next;
1515 (*fieldp)->name = strdup(str);
1516 if ((*fieldp)->name == NULL)
1519 goodname = (*fieldp)->name;
1520 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1522 /* If no name is specified, set the last field name (not array index)*/
1524 arg->name = strdup(goodname);
1525 if (arg->name == NULL)
1531 /* Parse perf-probe event command */
1532 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1535 int argc, i, ret = 0;
1537 argv = argv_split(cmd, &argc);
1539 pr_debug("Failed to split arguments.\n");
1542 if (argc - 1 > MAX_PROBE_ARGS) {
1543 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1547 /* Parse probe point */
1548 ret = parse_perf_probe_point(argv[0], pev);
1552 /* Copy arguments and ensure return probe has no C argument */
1553 pev->nargs = argc - 1;
1554 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1555 if (pev->args == NULL) {
1559 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1560 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1562 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1563 semantic_error("You can't specify local variable for"
1574 /* Return true if this perf_probe_event requires debuginfo */
1575 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1579 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1582 for (i = 0; i < pev->nargs; i++)
1583 if (is_c_varname(pev->args[i].var) ||
1584 !strcmp(pev->args[i].var, "$params") ||
1585 !strcmp(pev->args[i].var, "$vars"))
1591 /* Parse probe_events event into struct probe_point */
1592 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1594 struct probe_trace_point *tp = &tev->point;
1597 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1601 pr_debug("Parsing probe_events: %s\n", cmd);
1602 argv = argv_split(cmd, &argc);
1604 pr_debug("Failed to split arguments.\n");
1608 semantic_error("Too few probe arguments.\n");
1613 /* Scan event and group name. */
1614 argv0_str = strdup(argv[0]);
1615 if (argv0_str == NULL) {
1619 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1620 fmt2_str = strtok_r(NULL, "/", &fmt);
1621 fmt3_str = strtok_r(NULL, " \t", &fmt);
1622 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1623 || fmt3_str == NULL) {
1624 semantic_error("Failed to parse event name: %s\n", argv[0]);
1629 tev->group = strdup(fmt2_str);
1630 tev->event = strdup(fmt3_str);
1631 if (tev->group == NULL || tev->event == NULL) {
1635 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1637 tp->retprobe = (pr == 'r');
1639 /* Scan module name(if there), function name and offset */
1640 p = strchr(argv[1], ':');
1642 tp->module = strndup(argv[1], p - argv[1]);
1647 tev->uprobes = (tp->module[0] == '/');
1651 fmt1_str = strtok_r(p, "+", &fmt);
1652 /* only the address started with 0x */
1653 if (fmt1_str[0] == '0') {
1655 * Fix a special case:
1656 * if address == 0, kernel reports something like:
1657 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1658 * Newer kernel may fix that, but we want to
1659 * support old kernel also.
1661 if (strcmp(fmt1_str, "0x") == 0) {
1662 if (!argv[2] || strcmp(argv[2], "(null)")) {
1669 for (i = 2; argv[i + 1] != NULL; i++)
1670 argv[i] = argv[i + 1];
1675 tp->address = strtoul(fmt1_str, NULL, 0);
1677 /* Only the symbol-based probe has offset */
1678 tp->symbol = strdup(fmt1_str);
1679 if (tp->symbol == NULL) {
1683 fmt2_str = strtok_r(NULL, "", &fmt);
1684 if (fmt2_str == NULL)
1687 tp->offset = strtoul(fmt2_str, NULL, 10);
1690 tev->nargs = argc - 2;
1691 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1692 if (tev->args == NULL) {
1696 for (i = 0; i < tev->nargs; i++) {
1697 p = strchr(argv[i + 2], '=');
1698 if (p) /* We don't need which register is assigned. */
1702 tev->args[i].name = strdup(argv[i + 2]);
1703 /* TODO: parse regs and offset */
1704 tev->args[i].value = strdup(p);
1705 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1717 /* Compose only probe arg */
1718 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1720 struct perf_probe_arg_field *field = pa->field;
1725 if (strbuf_init(&buf, 64) < 0)
1728 if (pa->name && pa->var)
1729 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1731 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1736 if (field->name[0] == '[')
1737 err = strbuf_addstr(&buf, field->name);
1739 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1741 field = field->next;
1747 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1750 ret = strbuf_detach(&buf, NULL);
1752 strbuf_release(&buf);
1756 /* Compose only probe point (not argument) */
1757 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1760 char *tmp, *ret = NULL;
1763 if (strbuf_init(&buf, 64) < 0)
1767 if (strbuf_addstr(&buf, pp->function) < 0)
1770 err = strbuf_addf(&buf, "+%lu", pp->offset);
1772 err = strbuf_addf(&buf, ":%d", pp->line);
1773 else if (pp->retprobe)
1774 err = strbuf_addstr(&buf, "%return");
1782 tmp = strchr(pp->file + len - 30, '/');
1783 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1785 err = strbuf_addf(&buf, "@%s", tmp);
1786 if (!err && !pp->function && pp->line)
1787 err = strbuf_addf(&buf, ":%d", pp->line);
1790 ret = strbuf_detach(&buf, NULL);
1792 strbuf_release(&buf);
1796 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1799 char *tmp, *ret = NULL;
1802 if (strbuf_init(&buf, 64))
1805 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1809 tmp = synthesize_perf_probe_point(&pev->point);
1810 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1814 for (i = 0; i < pev->nargs; i++) {
1815 tmp = synthesize_perf_probe_arg(pev->args + i);
1816 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1821 ret = strbuf_detach(&buf, NULL);
1823 strbuf_release(&buf);
1827 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1828 struct strbuf *buf, int depth)
1832 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1837 err = strbuf_addf(buf, "%+ld(", ref->offset);
1838 return (err < 0) ? err : depth;
1841 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1844 struct probe_trace_arg_ref *ref = arg->ref;
1847 /* Argument name or separator */
1849 err = strbuf_addf(buf, " %s=", arg->name);
1851 err = strbuf_addch(buf, ' ');
1855 /* Special case: @XXX */
1856 if (arg->value[0] == '@' && arg->ref)
1859 /* Dereferencing arguments */
1861 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
1866 /* Print argument value */
1867 if (arg->value[0] == '@' && arg->ref)
1868 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
1870 err = strbuf_addstr(buf, arg->value);
1873 while (!err && depth--)
1874 err = strbuf_addch(buf, ')');
1876 /* Print argument type */
1877 if (!err && arg->type)
1878 err = strbuf_addf(buf, ":%s", arg->type);
1883 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1885 struct probe_trace_point *tp = &tev->point;
1890 /* Uprobes must have tp->module */
1891 if (tev->uprobes && !tp->module)
1894 if (strbuf_init(&buf, 32) < 0)
1897 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
1898 tev->group, tev->event) < 0)
1901 * If tp->address == 0, then this point must be a
1902 * absolute address uprobe.
1903 * try_to_find_absolute_address() should have made
1904 * tp->symbol to "0x0".
1906 if (tev->uprobes && !tp->address) {
1907 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
1911 /* Use the tp->address for uprobes */
1913 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
1914 else if (!strncmp(tp->symbol, "0x", 2))
1915 /* Absolute address. See try_to_find_absolute_address() */
1916 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
1917 tp->module ? ":" : "", tp->address);
1919 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
1920 tp->module ? ":" : "", tp->symbol, tp->offset);
1924 for (i = 0; i < tev->nargs; i++)
1925 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
1928 ret = strbuf_detach(&buf, NULL);
1930 strbuf_release(&buf);
1934 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
1935 struct perf_probe_point *pp,
1938 struct symbol *sym = NULL;
1940 u64 addr = tp->address;
1944 map = dso__new_map(tp->module);
1947 sym = map__find_symbol(map, addr, NULL);
1949 if (tp->symbol && !addr) {
1950 if (kernel_get_symbol_address_by_name(tp->symbol,
1951 &addr, true, false) < 0)
1956 sym = __find_kernel_function(addr, &map);
1963 pp->retprobe = tp->retprobe;
1964 pp->offset = addr - map->unmap_ip(map, sym->start);
1965 pp->function = strdup(sym->name);
1966 ret = pp->function ? 0 : -ENOMEM;
1969 if (map && !is_kprobe) {
1976 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1977 struct perf_probe_point *pp,
1983 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
1986 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
1990 pr_debug("Failed to find probe point from both of dwarf and map.\n");
1993 pp->function = strdup(tp->symbol);
1994 pp->offset = tp->offset;
1996 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
1999 pp->function = strdup(buf);
2002 if (pp->function == NULL)
2005 pp->retprobe = tp->retprobe;
2010 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2011 struct perf_probe_event *pev, bool is_kprobe)
2013 struct strbuf buf = STRBUF_INIT;
2016 /* Convert event/group name */
2017 pev->event = strdup(tev->event);
2018 pev->group = strdup(tev->group);
2019 if (pev->event == NULL || pev->group == NULL)
2022 /* Convert trace_point to probe_point */
2023 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2027 /* Convert trace_arg to probe_arg */
2028 pev->nargs = tev->nargs;
2029 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2030 if (pev->args == NULL)
2032 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2033 if (tev->args[i].name)
2034 pev->args[i].name = strdup(tev->args[i].name);
2036 if ((ret = strbuf_init(&buf, 32)) < 0)
2038 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2039 pev->args[i].name = strbuf_detach(&buf, NULL);
2041 if (pev->args[i].name == NULL && ret >= 0)
2046 clear_perf_probe_event(pev);
2051 void clear_perf_probe_event(struct perf_probe_event *pev)
2053 struct perf_probe_arg_field *field, *next;
2059 clear_perf_probe_point(&pev->point);
2061 for (i = 0; i < pev->nargs; i++) {
2062 free(pev->args[i].name);
2063 free(pev->args[i].var);
2064 free(pev->args[i].type);
2065 field = pev->args[i].field;
2068 zfree(&field->name);
2074 memset(pev, 0, sizeof(*pev));
2077 #define strdup_or_goto(str, label) \
2078 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2080 static int perf_probe_point__copy(struct perf_probe_point *dst,
2081 struct perf_probe_point *src)
2083 dst->file = strdup_or_goto(src->file, out_err);
2084 dst->function = strdup_or_goto(src->function, out_err);
2085 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2086 dst->line = src->line;
2087 dst->retprobe = src->retprobe;
2088 dst->offset = src->offset;
2092 clear_perf_probe_point(dst);
2096 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2097 struct perf_probe_arg *src)
2099 struct perf_probe_arg_field *field, **ppfield;
2101 dst->name = strdup_or_goto(src->name, out_err);
2102 dst->var = strdup_or_goto(src->var, out_err);
2103 dst->type = strdup_or_goto(src->type, out_err);
2106 ppfield = &(dst->field);
2108 *ppfield = zalloc(sizeof(*field));
2111 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2112 (*ppfield)->index = field->index;
2113 (*ppfield)->ref = field->ref;
2114 field = field->next;
2115 ppfield = &((*ppfield)->next);
2122 int perf_probe_event__copy(struct perf_probe_event *dst,
2123 struct perf_probe_event *src)
2127 dst->event = strdup_or_goto(src->event, out_err);
2128 dst->group = strdup_or_goto(src->group, out_err);
2129 dst->target = strdup_or_goto(src->target, out_err);
2130 dst->uprobes = src->uprobes;
2132 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2135 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2138 dst->nargs = src->nargs;
2140 for (i = 0; i < src->nargs; i++)
2141 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2146 clear_perf_probe_event(dst);
2150 void clear_probe_trace_event(struct probe_trace_event *tev)
2152 struct probe_trace_arg_ref *ref, *next;
2157 free(tev->point.symbol);
2158 free(tev->point.realname);
2159 free(tev->point.module);
2160 for (i = 0; i < tev->nargs; i++) {
2161 free(tev->args[i].name);
2162 free(tev->args[i].value);
2163 free(tev->args[i].type);
2164 ref = tev->args[i].ref;
2172 memset(tev, 0, sizeof(*tev));
2175 struct kprobe_blacklist_node {
2176 struct list_head list;
2177 unsigned long start;
2182 static void kprobe_blacklist__delete(struct list_head *blacklist)
2184 struct kprobe_blacklist_node *node;
2186 while (!list_empty(blacklist)) {
2187 node = list_first_entry(blacklist,
2188 struct kprobe_blacklist_node, list);
2189 list_del(&node->list);
2195 static int kprobe_blacklist__load(struct list_head *blacklist)
2197 struct kprobe_blacklist_node *node;
2198 const char *__debugfs = debugfs__mountpoint();
2199 char buf[PATH_MAX], *p;
2203 if (__debugfs == NULL)
2206 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2210 fp = fopen(buf, "r");
2215 while (fgets(buf, PATH_MAX, fp)) {
2216 node = zalloc(sizeof(*node));
2221 INIT_LIST_HEAD(&node->list);
2222 list_add_tail(&node->list, blacklist);
2223 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2227 p = strchr(buf, '\t');
2230 if (p[strlen(p) - 1] == '\n')
2231 p[strlen(p) - 1] = '\0';
2233 p = (char *)"unknown";
2234 node->symbol = strdup(p);
2235 if (!node->symbol) {
2239 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2240 node->start, node->end, node->symbol);
2244 kprobe_blacklist__delete(blacklist);
2250 static struct kprobe_blacklist_node *
2251 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2252 unsigned long address)
2254 struct kprobe_blacklist_node *node;
2256 list_for_each_entry(node, blacklist, list) {
2257 if (node->start <= address && address <= node->end)
2264 static LIST_HEAD(kprobe_blacklist);
2266 static void kprobe_blacklist__init(void)
2268 if (!list_empty(&kprobe_blacklist))
2271 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2272 pr_debug("No kprobe blacklist support, ignored\n");
2275 static void kprobe_blacklist__release(void)
2277 kprobe_blacklist__delete(&kprobe_blacklist);
2280 static bool kprobe_blacklist__listed(unsigned long address)
2282 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2285 static int perf_probe_event__sprintf(const char *group, const char *event,
2286 struct perf_probe_event *pev,
2288 struct strbuf *result)
2293 if (asprintf(&buf, "%s:%s", group, event) < 0)
2295 ret = strbuf_addf(result, " %-20s (on ", buf);
2300 /* Synthesize only event probe point */
2301 buf = synthesize_perf_probe_point(&pev->point);
2304 ret = strbuf_addstr(result, buf);
2308 ret = strbuf_addf(result, " in %s", module);
2310 if (!ret && pev->nargs > 0) {
2311 ret = strbuf_add(result, " with", 5);
2312 for (i = 0; !ret && i < pev->nargs; i++) {
2313 buf = synthesize_perf_probe_arg(&pev->args[i]);
2316 ret = strbuf_addf(result, " %s", buf);
2321 ret = strbuf_addch(result, ')');
2327 int show_perf_probe_event(const char *group, const char *event,
2328 struct perf_probe_event *pev,
2329 const char *module, bool use_stdout)
2331 struct strbuf buf = STRBUF_INIT;
2334 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2337 printf("%s\n", buf.buf);
2339 pr_info("%s\n", buf.buf);
2341 strbuf_release(&buf);
2346 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2347 struct strfilter *filter)
2351 /* At first, check the event name itself */
2352 if (strfilter__compare(filter, tev->event))
2355 /* Next, check the combination of name and group */
2356 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2358 return strfilter__compare(filter, tmp);
2361 static int __show_perf_probe_events(int fd, bool is_kprobe,
2362 struct strfilter *filter)
2365 struct probe_trace_event tev;
2366 struct perf_probe_event pev;
2367 struct strlist *rawlist;
2368 struct str_node *ent;
2370 memset(&tev, 0, sizeof(tev));
2371 memset(&pev, 0, sizeof(pev));
2373 rawlist = probe_file__get_rawlist(fd);
2377 strlist__for_each_entry(ent, rawlist) {
2378 ret = parse_probe_trace_command(ent->s, &tev);
2380 if (!filter_probe_trace_event(&tev, filter))
2382 ret = convert_to_perf_probe_event(&tev, &pev,
2386 ret = show_perf_probe_event(pev.group, pev.event,
2387 &pev, tev.point.module,
2391 clear_perf_probe_event(&pev);
2392 clear_probe_trace_event(&tev);
2396 strlist__delete(rawlist);
2397 /* Cleanup cached debuginfo if needed */
2398 debuginfo_cache__exit();
2403 /* List up current perf-probe events */
2404 int show_perf_probe_events(struct strfilter *filter)
2406 int kp_fd, up_fd, ret;
2410 if (probe_conf.cache)
2411 return probe_cache__show_all_caches(filter);
2413 ret = init_probe_symbol_maps(false);
2417 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2422 ret = __show_perf_probe_events(kp_fd, true, filter);
2423 if (up_fd >= 0 && ret >= 0)
2424 ret = __show_perf_probe_events(up_fd, false, filter);
2429 exit_probe_symbol_maps();
2434 static int get_new_event_name(char *buf, size_t len, const char *base,
2435 struct strlist *namelist, bool allow_suffix)
2442 nbase = strdup(base);
2446 /* Cut off the dot suffixes (e.g. .const, .isra)*/
2447 p = strchr(nbase, '.');
2448 if (p && p != nbase)
2451 /* Try no suffix number */
2452 ret = e_snprintf(buf, len, "%s", nbase);
2454 pr_debug("snprintf() failed: %d\n", ret);
2457 if (!strlist__has_entry(namelist, buf))
2460 if (!allow_suffix) {
2461 pr_warning("Error: event \"%s\" already exists.\n"
2462 " Hint: Remove existing event by 'perf probe -d'\n"
2463 " or force duplicates by 'perf probe -f'\n"
2464 " or set 'force=yes' in BPF source.\n",
2470 /* Try to add suffix */
2471 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2472 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2474 pr_debug("snprintf() failed: %d\n", ret);
2477 if (!strlist__has_entry(namelist, buf))
2480 if (i == MAX_EVENT_INDEX) {
2481 pr_warning("Too many events are on the same function.\n");
2490 /* Warn if the current kernel's uprobe implementation is old */
2491 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2494 char *buf = synthesize_probe_trace_command(tev);
2496 /* Old uprobe event doesn't support memory dereference */
2497 if (!tev->uprobes || tev->nargs == 0 || !buf)
2500 for (i = 0; i < tev->nargs; i++)
2501 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2502 pr_warning("Please upgrade your kernel to at least "
2503 "3.14 to have access to feature %s\n",
2504 tev->args[i].value);
2511 /* Set new name from original perf_probe_event and namelist */
2512 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2513 struct perf_probe_event *pev,
2514 struct strlist *namelist,
2517 const char *event, *group;
2521 /* If probe_event or trace_event already have the name, reuse it */
2522 if (pev->event && !pev->sdt)
2524 else if (tev->event)
2527 /* Or generate new one from probe point */
2528 if (pev->point.function &&
2529 (strncmp(pev->point.function, "0x", 2) != 0) &&
2530 !strisglob(pev->point.function))
2531 event = pev->point.function;
2533 event = tev->point.realname;
2535 if (pev->group && !pev->sdt)
2537 else if (tev->group)
2540 group = PERFPROBE_GROUP;
2542 /* Get an unused new event name */
2543 ret = get_new_event_name(buf, 64, event,
2544 namelist, allow_suffix);
2550 tev->event = strdup(event);
2551 tev->group = strdup(group);
2552 if (tev->event == NULL || tev->group == NULL)
2555 /* Add added event name to namelist */
2556 strlist__add(namelist, event);
2560 static int __open_probe_file_and_namelist(bool uprobe,
2561 struct strlist **namelist)
2565 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2569 /* Get current event names */
2570 *namelist = probe_file__get_namelist(fd);
2572 pr_debug("Failed to get current event list.\n");
2579 static int __add_probe_trace_events(struct perf_probe_event *pev,
2580 struct probe_trace_event *tevs,
2581 int ntevs, bool allow_suffix)
2583 int i, fd[2] = {-1, -1}, up, ret;
2584 struct probe_trace_event *tev = NULL;
2585 struct probe_cache *cache = NULL;
2586 struct strlist *namelist[2] = {NULL, NULL};
2588 up = pev->uprobes ? 1 : 0;
2589 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2594 for (i = 0; i < ntevs; i++) {
2596 up = tev->uprobes ? 1 : 0;
2597 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2598 fd[up] = __open_probe_file_and_namelist(up,
2603 /* Skip if the symbol is out of .text or blacklisted */
2604 if (!tev->point.symbol && !pev->uprobes)
2607 /* Set new name for tev (and update namelist) */
2608 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2613 ret = probe_file__add_event(fd[up], tev);
2618 * Probes after the first probe which comes from same
2619 * user input are always allowed to add suffix, because
2620 * there might be several addresses corresponding to
2623 allow_suffix = true;
2625 if (ret == -EINVAL && pev->uprobes)
2626 warn_uprobe_event_compat(tev);
2627 if (ret == 0 && probe_conf.cache) {
2628 cache = probe_cache__new(pev->target);
2630 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2631 probe_cache__commit(cache) < 0)
2632 pr_warning("Failed to add event to probe cache\n");
2633 probe_cache__delete(cache);
2637 for (up = 0; up < 2; up++) {
2638 strlist__delete(namelist[up]);
2645 static int find_probe_functions(struct map *map, char *name,
2646 struct symbol **syms)
2650 struct rb_node *tmp;
2652 if (map__load(map, NULL) < 0)
2655 map__for_each_symbol(map, sym, tmp) {
2656 if (strglobmatch(sym->name, name)) {
2658 if (syms && found < probe_conf.max_probes)
2659 syms[found - 1] = sym;
2666 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2667 struct probe_trace_event *tev __maybe_unused,
2668 struct map *map __maybe_unused,
2669 struct symbol *sym __maybe_unused) { }
2672 * Find probe function addresses from map.
2673 * Return an error or the number of found probe_trace_event
2675 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2676 struct probe_trace_event **tevs)
2678 struct map *map = NULL;
2679 struct ref_reloc_sym *reloc_sym = NULL;
2681 struct symbol **syms = NULL;
2682 struct probe_trace_event *tev;
2683 struct perf_probe_point *pp = &pev->point;
2684 struct probe_trace_point *tp;
2685 int num_matched_functions;
2686 int ret, i, j, skipped = 0;
2689 map = get_target_map(pev->target, pev->uprobes);
2695 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2702 * Load matched symbols: Since the different local symbols may have
2703 * same name but different addresses, this lists all the symbols.
2705 num_matched_functions = find_probe_functions(map, pp->function, syms);
2706 if (num_matched_functions == 0) {
2707 pr_err("Failed to find symbol %s in %s\n", pp->function,
2708 pev->target ? : "kernel");
2711 } else if (num_matched_functions > probe_conf.max_probes) {
2712 pr_err("Too many functions matched in %s\n",
2713 pev->target ? : "kernel");
2718 /* Note that the symbols in the kmodule are not relocated */
2719 if (!pev->uprobes && !pp->retprobe && !pev->target) {
2720 reloc_sym = kernel_get_ref_reloc_sym();
2722 pr_warning("Relocated base symbol is not found!\n");
2728 /* Setup result trace-probe-events */
2729 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2737 for (j = 0; j < num_matched_functions; j++) {
2740 tev = (*tevs) + ret;
2742 if (ret == num_matched_functions) {
2743 pr_warning("Too many symbols are listed. Skip it.\n");
2748 if (pp->offset > sym->end - sym->start) {
2749 pr_warning("Offset %ld is bigger than the size of %s\n",
2750 pp->offset, sym->name);
2754 /* Add one probe point */
2755 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2757 /* Check the kprobe (not in module) is within .text */
2758 if (!pev->uprobes && !pev->target &&
2759 kprobe_warn_out_range(sym->name, tp->address)) {
2760 tp->symbol = NULL; /* Skip it */
2762 } else if (reloc_sym) {
2763 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2764 tp->offset = tp->address - reloc_sym->addr;
2766 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2767 tp->offset = pp->offset;
2769 tp->realname = strdup_or_goto(sym->name, nomem_out);
2771 tp->retprobe = pp->retprobe;
2774 tev->point.module = strdup_or_goto(pev->target,
2777 mod_name = find_module_name(pev->target);
2779 strdup(mod_name ? mod_name : pev->target);
2781 if (!tev->point.module)
2785 tev->uprobes = pev->uprobes;
2786 tev->nargs = pev->nargs;
2788 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2790 if (tev->args == NULL)
2793 for (i = 0; i < tev->nargs; i++) {
2794 if (pev->args[i].name)
2796 strdup_or_goto(pev->args[i].name,
2799 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2801 if (pev->args[i].type)
2803 strdup_or_goto(pev->args[i].type,
2806 arch__fix_tev_from_maps(pev, tev, map, sym);
2808 if (ret == skipped) {
2814 put_target_map(map, pev->uprobes);
2821 clear_probe_trace_events(*tevs, num_matched_functions);
2826 static int try_to_find_absolute_address(struct perf_probe_event *pev,
2827 struct probe_trace_event **tevs)
2829 struct perf_probe_point *pp = &pev->point;
2830 struct probe_trace_event *tev;
2831 struct probe_trace_point *tp;
2834 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
2836 if (perf_probe_event_need_dwarf(pev))
2840 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
2843 * Only one tev can be generated by this.
2845 *tevs = zalloc(sizeof(*tev));
2853 * Don't use tp->offset, use address directly, because
2854 * in synthesize_probe_trace_command() address cannot be
2857 tp->address = pev->point.abs_address;
2858 tp->retprobe = pp->retprobe;
2859 tev->uprobes = pev->uprobes;
2863 * Give it a '0x' leading symbol name.
2864 * In __add_probe_trace_events, a NULL symbol is interpreted as
2867 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
2870 /* For kprobe, check range */
2871 if ((!tev->uprobes) &&
2872 (kprobe_warn_out_range(tev->point.symbol,
2873 tev->point.address))) {
2878 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
2882 tp->module = strdup(pev->target);
2888 tev->group = strdup(pev->group);
2894 tev->event = strdup(pev->event);
2899 tev->nargs = pev->nargs;
2900 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
2905 for (i = 0; i < tev->nargs; i++)
2906 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
2912 clear_probe_trace_events(*tevs, 1);
2918 bool __weak arch__prefers_symtab(void) { return false; }
2920 /* Concatinate two arrays */
2921 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
2925 ret = malloc(sz_a + sz_b);
2927 memcpy(ret, a, sz_a);
2928 memcpy(ret + sz_a, b, sz_b);
2934 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
2935 struct probe_trace_event **tevs2, int ntevs2)
2937 struct probe_trace_event *new_tevs;
2947 if (*ntevs + ntevs2 > probe_conf.max_probes)
2950 /* Concatinate the array of probe_trace_event */
2951 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
2952 *tevs2, ntevs2 * sizeof(**tevs2));
2962 clear_probe_trace_events(*tevs2, ntevs2);
2969 * Try to find probe_trace_event from given probe caches. Return the number
2970 * of cached events found, if an error occurs return the error.
2972 static int find_cached_events(struct perf_probe_event *pev,
2973 struct probe_trace_event **tevs,
2976 struct probe_cache *cache;
2977 struct probe_cache_entry *entry;
2978 struct probe_trace_event *tmp_tevs = NULL;
2982 cache = probe_cache__new(target);
2983 /* Return 0 ("not found") if the target has no probe cache. */
2987 for_each_probe_cache_entry(entry, cache) {
2988 /* Skip the cache entry which has no name */
2989 if (!entry->pev.event || !entry->pev.group)
2991 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
2992 strglobmatch(entry->pev.event, pev->event)) {
2993 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
2995 ret = concat_probe_trace_events(tevs, &ntevs,
3001 probe_cache__delete(cache);
3003 clear_probe_trace_events(*tevs, ntevs);
3007 if (ntevs > 0 && target && target[0] == '/')
3008 pev->uprobes = true;
3014 /* Try to find probe_trace_event from all probe caches */
3015 static int find_cached_events_all(struct perf_probe_event *pev,
3016 struct probe_trace_event **tevs)
3018 struct probe_trace_event *tmp_tevs = NULL;
3019 struct strlist *bidlist;
3020 struct str_node *nd;
3025 /* Get the buildid list of all valid caches */
3026 bidlist = build_id_cache__list_all(true);
3029 pr_debug("Failed to get buildids: %d\n", ret);
3034 strlist__for_each_entry(nd, bidlist) {
3035 pathname = build_id_cache__origname(nd->s);
3036 ret = find_cached_events(pev, &tmp_tevs, pathname);
3037 /* In the case of cnt == 0, we just skip it */
3039 ret = concat_probe_trace_events(tevs, &ntevs,
3045 strlist__delete(bidlist);
3048 clear_probe_trace_events(*tevs, ntevs);
3056 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3057 struct probe_trace_event **tevs)
3059 struct probe_cache *cache;
3060 struct probe_cache_entry *entry;
3061 struct probe_trace_event *tev;
3062 struct str_node *node;
3066 /* For SDT/cached events, we use special search functions */
3068 return find_cached_events_all(pev, tevs);
3070 return find_cached_events(pev, tevs, pev->target);
3072 cache = probe_cache__new(pev->target);
3076 entry = probe_cache__find(cache, pev);
3078 /* SDT must be in the cache */
3079 ret = pev->sdt ? -ENOENT : 0;
3083 ret = strlist__nr_entries(entry->tevlist);
3084 if (ret > probe_conf.max_probes) {
3085 pr_debug("Too many entries matched in the cache of %s\n",
3086 pev->target ? : "kernel");
3091 *tevs = zalloc(ret * sizeof(*tev));
3098 strlist__for_each_entry(node, entry->tevlist) {
3099 tev = &(*tevs)[i++];
3100 ret = parse_probe_trace_command(node->s, tev);
3103 /* Set the uprobes attribute as same as original */
3104 tev->uprobes = pev->uprobes;
3109 probe_cache__delete(cache);
3113 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3114 struct probe_trace_event **tevs)
3118 if (!pev->group && !pev->sdt) {
3119 /* Set group name if not given */
3120 if (!pev->uprobes) {
3121 pev->group = strdup(PERFPROBE_GROUP);
3122 ret = pev->group ? 0 : -ENOMEM;
3124 ret = convert_exec_to_group(pev->target, &pev->group);
3126 pr_warning("Failed to make a group name.\n");
3131 ret = try_to_find_absolute_address(pev, tevs);
3135 /* At first, we need to lookup cache entry */
3136 ret = find_probe_trace_events_from_cache(pev, tevs);
3137 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3138 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3140 if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
3141 ret = find_probe_trace_events_from_map(pev, tevs);
3143 return ret; /* Found in symbol table */
3146 /* Convert perf_probe_event with debuginfo */
3147 ret = try_to_find_probe_trace_events(pev, tevs);
3149 return ret; /* Found in debuginfo or got an error */
3151 return find_probe_trace_events_from_map(pev, tevs);
3154 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3158 /* Loop 1: convert all events */
3159 for (i = 0; i < npevs; i++) {
3160 /* Init kprobe blacklist if needed */
3161 if (!pevs[i].uprobes)
3162 kprobe_blacklist__init();
3163 /* Convert with or without debuginfo */
3164 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3167 pevs[i].ntevs = ret;
3169 /* This just release blacklist only if allocated */
3170 kprobe_blacklist__release();
3175 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3179 /* Loop 2: add all events */
3180 for (i = 0; i < npevs; i++) {
3181 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3183 probe_conf.force_add);
3190 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3194 /* Loop 3: cleanup and free trace events */
3195 for (i = 0; i < npevs; i++) {
3196 for (j = 0; j < pevs[i].ntevs; j++)
3197 clear_probe_trace_event(&pevs[i].tevs[j]);
3198 zfree(&pevs[i].tevs);
3200 clear_perf_probe_event(&pevs[i]);
3204 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3208 ret = init_probe_symbol_maps(pevs->uprobes);
3212 ret = convert_perf_probe_events(pevs, npevs);
3214 ret = apply_perf_probe_events(pevs, npevs);
3216 cleanup_perf_probe_events(pevs, npevs);
3218 exit_probe_symbol_maps();
3222 int del_perf_probe_events(struct strfilter *filter)
3224 int ret, ret2, ufd = -1, kfd = -1;
3225 char *str = strfilter__string(filter);
3230 /* Get current event names */
3231 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3235 ret = probe_file__del_events(kfd, filter);
3236 if (ret < 0 && ret != -ENOENT)
3239 ret2 = probe_file__del_events(ufd, filter);
3240 if (ret2 < 0 && ret2 != -ENOENT) {
3257 /* TODO: don't use a global variable for filter ... */
3258 static struct strfilter *available_func_filter;
3261 * If a symbol corresponds to a function with global binding and
3262 * matches filter return 0. For all others return 1.
3264 static int filter_available_functions(struct map *map __maybe_unused,
3267 if (strfilter__compare(available_func_filter, sym->name))
3272 int show_available_funcs(const char *target, struct strfilter *_filter,
3278 ret = init_probe_symbol_maps(user);
3282 /* Get a symbol map */
3284 map = dso__new_map(target);
3286 map = kernel_get_module_map(target);
3288 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3292 /* Load symbols with given filter */
3293 available_func_filter = _filter;
3294 if (map__load(map, filter_available_functions)) {
3295 pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
3298 if (!dso__sorted_by_name(map->dso, map->type))
3299 dso__sort_by_name(map->dso, map->type);
3301 /* Show all (filtered) symbols */
3303 dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
3308 exit_probe_symbol_maps();
3313 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3314 struct perf_probe_arg *pvar)
3316 tvar->value = strdup(pvar->var);
3317 if (tvar->value == NULL)
3320 tvar->type = strdup(pvar->type);
3321 if (tvar->type == NULL)
3325 tvar->name = strdup(pvar->name);
3326 if (tvar->name == NULL)