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/debugfs.h>
44 #include <api/fs/tracefs.h>
45 #include "trace-event.h" /* For __maybe_unused */
46 #include "probe-event.h"
47 #include "probe-finder.h"
50 #define MAX_CMDLEN 256
51 #define PERFPROBE_GROUP "probe"
53 bool probe_event_dry_run; /* Dry run flag */
55 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
57 /* If there is no space to write, returns -E2BIG. */
58 static int e_snprintf(char *str, size_t size, const char *format, ...)
59 __attribute__((format(printf, 3, 4)));
61 static int e_snprintf(char *str, size_t size, const char *format, ...)
66 ret = vsnprintf(str, size, format, ap);
73 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
74 static void clear_probe_trace_event(struct probe_trace_event *tev);
75 static struct machine *host_machine;
77 /* Initialize symbol maps and path of vmlinux/modules */
78 static int init_symbol_maps(bool user_only)
82 symbol_conf.sort_by_name = true;
83 symbol_conf.allow_aliases = true;
84 ret = symbol__init(NULL);
86 pr_debug("Failed to init symbol map.\n");
90 if (host_machine || user_only) /* already initialized */
93 if (symbol_conf.vmlinux_name)
94 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
96 host_machine = machine__new_host();
98 pr_debug("machine__new_host() failed.\n");
104 pr_warning("Failed to init vmlinux path.\n");
108 static void exit_symbol_maps(void)
111 machine__delete(host_machine);
117 static struct symbol *__find_kernel_function_by_name(const char *name,
120 return machine__find_kernel_function_by_name(host_machine, name, mapp,
124 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
126 return machine__find_kernel_function(host_machine, addr, mapp, NULL);
129 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
131 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
134 if (map__load(host_machine->vmlinux_maps[MAP__FUNCTION], NULL) < 0)
137 kmap = map__kmap(host_machine->vmlinux_maps[MAP__FUNCTION]);
140 return kmap->ref_reloc_sym;
143 static u64 kernel_get_symbol_address_by_name(const char *name, bool reloc)
145 struct ref_reloc_sym *reloc_sym;
149 /* ref_reloc_sym is just a label. Need a special fix*/
150 reloc_sym = kernel_get_ref_reloc_sym();
151 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
152 return (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
154 sym = __find_kernel_function_by_name(name, &map);
156 return map->unmap_ip(map, sym->start) -
157 ((reloc) ? 0 : map->reloc);
162 static struct map *kernel_get_module_map(const char *module)
165 struct map_groups *grp = &host_machine->kmaps;
167 /* A file path -- this is an offline module */
168 if (module && strchr(module, '/'))
169 return machine__new_module(host_machine, 0, module);
174 for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
175 struct map *pos = rb_entry(nd, struct map, rb_node);
176 if (strncmp(pos->dso->short_name + 1, module,
177 pos->dso->short_name_len - 2) == 0) {
184 static struct map *get_target_map(const char *target, bool user)
186 /* Init maps of given executable or kernel */
188 return dso__new_map(target);
190 return kernel_get_module_map(target);
193 static void put_target_map(struct map *map, bool user)
196 /* Only the user map needs to be released */
197 dso__delete(map->dso);
203 static struct dso *kernel_get_module_dso(const char *module)
207 const char *vmlinux_name;
210 list_for_each_entry(dso, &host_machine->kernel_dsos.head,
212 if (strncmp(dso->short_name + 1, module,
213 dso->short_name_len - 2) == 0)
216 pr_debug("Failed to find module %s.\n", module);
220 map = host_machine->vmlinux_maps[MAP__FUNCTION];
223 vmlinux_name = symbol_conf.vmlinux_name;
225 if (dso__load_vmlinux(dso, map, vmlinux_name, false, NULL) <= 0)
228 if (dso__load_vmlinux_path(dso, map, NULL) <= 0) {
229 pr_debug("Failed to load kernel map.\n");
237 const char *kernel_get_module_path(const char *module)
239 struct dso *dso = kernel_get_module_dso(module);
240 return (dso) ? dso->long_name : NULL;
243 static int convert_exec_to_group(const char *exec, char **result)
245 char *ptr1, *ptr2, *exec_copy;
249 exec_copy = strdup(exec);
253 ptr1 = basename(exec_copy);
259 ptr2 = strpbrk(ptr1, "-._");
262 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
266 *result = strdup(buf);
267 ret = *result ? 0 : -ENOMEM;
274 static void clear_perf_probe_point(struct perf_probe_point *pp)
281 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
285 for (i = 0; i < ntevs; i++)
286 clear_probe_trace_event(tevs + i);
289 #ifdef HAVE_DWARF_SUPPORT
291 * Some binaries like glibc have special symbols which are on the symbol
292 * table, but not in the debuginfo. If we can find the address of the
293 * symbol from map, we can translate the address back to the probe point.
295 static int find_alternative_probe_point(struct debuginfo *dinfo,
296 struct perf_probe_point *pp,
297 struct perf_probe_point *result,
298 const char *target, bool uprobes)
300 struct map *map = NULL;
305 /* This can work only for function-name based one */
306 if (!pp->function || pp->file)
309 map = get_target_map(target, uprobes);
313 /* Find the address of given function */
314 map__for_each_symbol_by_name(map, pp->function, sym) {
316 address = sym->start;
318 address = map->unmap_ip(map, sym->start);
325 pr_debug("Symbol %s address found : %" PRIx64 "\n",
326 pp->function, address);
328 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
331 ret = (!ret) ? -ENOENT : ret;
333 result->offset += pp->offset;
334 result->line += pp->line;
335 result->retprobe = pp->retprobe;
340 put_target_map(map, uprobes);
345 static int get_alternative_probe_event(struct debuginfo *dinfo,
346 struct perf_probe_event *pev,
347 struct perf_probe_point *tmp,
352 memcpy(tmp, &pev->point, sizeof(*tmp));
353 memset(&pev->point, 0, sizeof(pev->point));
354 ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
355 target, pev->uprobes);
357 memcpy(&pev->point, tmp, sizeof(*tmp));
362 static int get_alternative_line_range(struct debuginfo *dinfo,
363 struct line_range *lr,
364 const char *target, bool user)
366 struct perf_probe_point pp = { .function = lr->function,
369 struct perf_probe_point result;
372 memset(&result, 0, sizeof(result));
374 if (lr->end != INT_MAX)
375 len = lr->end - lr->start;
376 ret = find_alternative_probe_point(dinfo, &pp, &result,
379 lr->function = result.function;
380 lr->file = result.file;
381 lr->start = result.line;
382 if (lr->end != INT_MAX)
383 lr->end = lr->start + len;
384 clear_perf_probe_point(&pp);
389 /* Open new debuginfo of given module */
390 static struct debuginfo *open_debuginfo(const char *module, bool silent)
392 const char *path = module;
393 struct debuginfo *ret;
395 if (!module || !strchr(module, '/')) {
396 path = kernel_get_module_path(module);
399 pr_err("Failed to find path of %s module.\n",
404 ret = debuginfo__new(path);
405 if (!ret && !silent) {
406 pr_warning("The %s file has no debug information.\n", path);
407 if (!module || !strtailcmp(path, ".ko"))
408 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
410 pr_warning("Rebuild with -g, ");
411 pr_warning("or install an appropriate debuginfo package.\n");
417 static int get_text_start_address(const char *exec, unsigned long *address)
422 int fd, ret = -ENOENT;
424 fd = open(exec, O_RDONLY);
428 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
432 if (gelf_getehdr(elf, &ehdr) == NULL)
435 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
438 *address = shdr.sh_addr - shdr.sh_offset;
446 * Convert trace point to probe point with debuginfo
448 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
449 struct perf_probe_point *pp,
452 struct debuginfo *dinfo = NULL;
453 unsigned long stext = 0;
454 u64 addr = tp->address;
457 /* convert the address to dwarf address */
463 ret = get_text_start_address(tp->module, &stext);
468 addr = kernel_get_symbol_address_by_name(tp->symbol, false);
474 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
475 tp->module ? : "kernel");
477 dinfo = open_debuginfo(tp->module, verbose == 0);
479 ret = debuginfo__find_probe_point(dinfo,
480 (unsigned long)addr, pp);
481 debuginfo__delete(dinfo);
486 pp->retprobe = tp->retprobe;
490 pr_debug("Failed to find corresponding probes from debuginfo.\n");
491 return ret ? : -ENOENT;
494 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
495 int ntevs, const char *exec)
498 unsigned long stext = 0;
503 ret = get_text_start_address(exec, &stext);
507 for (i = 0; i < ntevs && ret >= 0; i++) {
508 /* point.address is the addres of point.symbol + point.offset */
509 tevs[i].point.address -= stext;
510 tevs[i].point.module = strdup(exec);
511 if (!tevs[i].point.module) {
515 tevs[i].uprobes = true;
521 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
522 int ntevs, const char *module)
530 tmp = strrchr(module, '/');
532 /* This is a module path -- get the module name */
533 module = strdup(tmp + 1);
536 tmp = strchr(module, '.');
539 tmp = (char *)module; /* For free() */
542 for (i = 0; i < ntevs; i++) {
543 tevs[i].point.module = strdup(module);
544 if (!tevs[i].point.module) {
554 /* Post processing the probe events */
555 static int post_process_probe_trace_events(struct probe_trace_event *tevs,
556 int ntevs, const char *module,
559 struct ref_reloc_sym *reloc_sym;
564 return add_exec_to_probe_trace_events(tevs, ntevs, module);
566 /* Note that currently ref_reloc_sym based probe is not for drivers */
568 return add_module_to_probe_trace_events(tevs, ntevs, module);
570 reloc_sym = kernel_get_ref_reloc_sym();
572 pr_warning("Relocated base symbol is not found!\n");
576 for (i = 0; i < ntevs; i++) {
577 if (tevs[i].point.address && !tevs[i].point.retprobe) {
578 tmp = strdup(reloc_sym->name);
581 free(tevs[i].point.symbol);
582 tevs[i].point.symbol = tmp;
583 tevs[i].point.offset = tevs[i].point.address -
584 reloc_sym->unrelocated_addr;
590 /* Try to find perf_probe_event with debuginfo */
591 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
592 struct probe_trace_event **tevs,
593 int max_tevs, const char *target)
595 bool need_dwarf = perf_probe_event_need_dwarf(pev);
596 struct perf_probe_point tmp;
597 struct debuginfo *dinfo;
600 dinfo = open_debuginfo(target, !need_dwarf);
605 pr_debug("Could not open debuginfo. Try to use symbols.\n");
609 pr_debug("Try to find probe point from debuginfo.\n");
610 /* Searching trace events corresponding to a probe event */
611 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
613 if (ntevs == 0) { /* Not found, retry with an alternative */
614 ret = get_alternative_probe_event(dinfo, pev, &tmp, target);
616 ntevs = debuginfo__find_trace_events(dinfo, pev,
619 * Write back to the original probe_event for
620 * setting appropriate (user given) event name
622 clear_perf_probe_point(&pev->point);
623 memcpy(&pev->point, &tmp, sizeof(tmp));
627 debuginfo__delete(dinfo);
629 if (ntevs > 0) { /* Succeeded to find trace events */
630 pr_debug("Found %d probe_trace_events.\n", ntevs);
631 ret = post_process_probe_trace_events(*tevs, ntevs,
632 target, pev->uprobes);
634 clear_probe_trace_events(*tevs, ntevs);
637 return ret < 0 ? ret : ntevs;
640 if (ntevs == 0) { /* No error but failed to find probe point. */
641 pr_warning("Probe point '%s' not found.\n",
642 synthesize_perf_probe_point(&pev->point));
645 /* Error path : ntevs < 0 */
646 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
647 if (ntevs == -EBADF) {
648 pr_warning("Warning: No dwarf info found in the vmlinux - "
649 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
651 pr_debug("Trying to use symbols.\n");
658 #define LINEBUF_SIZE 256
659 #define NR_ADDITIONAL_LINES 2
661 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
663 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
664 const char *color = show_num ? "" : PERF_COLOR_BLUE;
665 const char *prefix = NULL;
668 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
673 prefix = show_num ? "%7d " : " ";
674 color_fprintf(stdout, color, prefix, l);
676 color_fprintf(stdout, color, "%s", buf);
678 } while (strchr(buf, '\n') == NULL);
683 pr_warning("File read error: %s\n",
684 strerror_r(errno, sbuf, sizeof(sbuf)));
690 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
692 int rv = __show_one_line(fp, l, skip, show_num);
694 pr_warning("Source file is shorter than expected.\n");
700 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
701 #define show_one_line(f,l) _show_one_line(f,l,false,false)
702 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
703 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
706 * Show line-range always requires debuginfo to find source file and
709 static int __show_line_range(struct line_range *lr, const char *module,
714 struct debuginfo *dinfo;
718 char sbuf[STRERR_BUFSIZE];
720 /* Search a line range */
721 dinfo = open_debuginfo(module, false);
725 ret = debuginfo__find_line_range(dinfo, lr);
726 if (!ret) { /* Not found, retry with an alternative */
727 ret = get_alternative_line_range(dinfo, lr, module, user);
729 ret = debuginfo__find_line_range(dinfo, lr);
731 debuginfo__delete(dinfo);
732 if (ret == 0 || ret == -ENOENT) {
733 pr_warning("Specified source line is not found.\n");
735 } else if (ret < 0) {
736 pr_warning("Debuginfo analysis failed.\n");
740 /* Convert source file path */
742 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
744 /* Free old path when new path is assigned */
749 pr_warning("Failed to find source file path.\n");
756 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
757 lr->start - lr->offset);
759 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
761 fp = fopen(lr->path, "r");
763 pr_warning("Failed to open %s: %s\n", lr->path,
764 strerror_r(errno, sbuf, sizeof(sbuf)));
767 /* Skip to starting line number */
768 while (l < lr->start) {
769 ret = skip_one_line(fp, l++);
774 intlist__for_each(ln, lr->line_list) {
775 for (; ln->i > l; l++) {
776 ret = show_one_line(fp, l - lr->offset);
780 ret = show_one_line_with_num(fp, l++ - lr->offset);
785 if (lr->end == INT_MAX)
786 lr->end = l + NR_ADDITIONAL_LINES;
787 while (l <= lr->end) {
788 ret = show_one_line_or_eof(fp, l++ - lr->offset);
797 int show_line_range(struct line_range *lr, const char *module, bool user)
801 ret = init_symbol_maps(user);
804 ret = __show_line_range(lr, module, user);
810 static int show_available_vars_at(struct debuginfo *dinfo,
811 struct perf_probe_event *pev,
812 int max_vls, struct strfilter *_filter,
813 bool externs, const char *target)
817 struct str_node *node;
818 struct variable_list *vls = NULL, *vl;
819 struct perf_probe_point tmp;
822 buf = synthesize_perf_probe_point(&pev->point);
825 pr_debug("Searching variables at %s\n", buf);
827 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
829 if (!ret) { /* Not found, retry with an alternative */
830 ret = get_alternative_probe_event(dinfo, pev, &tmp, target);
832 ret = debuginfo__find_available_vars_at(dinfo, pev,
833 &vls, max_vls, externs);
834 /* Release the old probe_point */
835 clear_perf_probe_point(&tmp);
839 if (ret == 0 || ret == -ENOENT) {
840 pr_err("Failed to find the address of %s\n", buf);
843 pr_warning("Debuginfo analysis failed.\n");
847 /* Some variables are found */
848 fprintf(stdout, "Available variables at %s\n", buf);
849 for (i = 0; i < ret; i++) {
852 * A probe point might be converted to
853 * several trace points.
855 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
857 zfree(&vl->point.symbol);
860 strlist__for_each(node, vl->vars) {
861 var = strchr(node->s, '\t') + 1;
862 if (strfilter__compare(_filter, var)) {
863 fprintf(stdout, "\t\t%s\n", node->s);
867 strlist__delete(vl->vars);
870 fprintf(stdout, "\t\t(No matched variables)\n");
878 /* Show available variables on given probe point */
879 int show_available_vars(struct perf_probe_event *pevs, int npevs,
880 int max_vls, const char *module,
881 struct strfilter *_filter, bool externs)
884 struct debuginfo *dinfo;
886 ret = init_symbol_maps(pevs->uprobes);
890 dinfo = open_debuginfo(module, false);
898 for (i = 0; i < npevs && ret >= 0; i++)
899 ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
902 debuginfo__delete(dinfo);
908 #else /* !HAVE_DWARF_SUPPORT */
911 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
912 struct perf_probe_point *pp __maybe_unused,
913 bool is_kprobe __maybe_unused)
918 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
919 struct probe_trace_event **tevs __maybe_unused,
920 int max_tevs __maybe_unused,
921 const char *target __maybe_unused)
923 if (perf_probe_event_need_dwarf(pev)) {
924 pr_warning("Debuginfo-analysis is not supported.\n");
931 int show_line_range(struct line_range *lr __maybe_unused,
932 const char *module __maybe_unused,
933 bool user __maybe_unused)
935 pr_warning("Debuginfo-analysis is not supported.\n");
939 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
940 int npevs __maybe_unused, int max_vls __maybe_unused,
941 const char *module __maybe_unused,
942 struct strfilter *filter __maybe_unused,
943 bool externs __maybe_unused)
945 pr_warning("Debuginfo-analysis is not supported.\n");
950 void line_range__clear(struct line_range *lr)
956 intlist__delete(lr->line_list);
957 memset(lr, 0, sizeof(*lr));
960 int line_range__init(struct line_range *lr)
962 memset(lr, 0, sizeof(*lr));
963 lr->line_list = intlist__new(NULL);
970 static int parse_line_num(char **ptr, int *val, const char *what)
972 const char *start = *ptr;
975 *val = strtol(*ptr, ptr, 0);
976 if (errno || *ptr == start) {
977 semantic_error("'%s' is not a valid number.\n", what);
984 * Stuff 'lr' according to the line range described by 'arg'.
985 * The line range syntax is described by:
987 * SRC[:SLN[+NUM|-ELN]]
988 * FNC[@SRC][:SLN[+NUM|-ELN]]
990 int parse_line_range_desc(const char *arg, struct line_range *lr)
992 char *range, *file, *name = strdup(arg);
1001 range = strchr(name, ':');
1005 err = parse_line_num(&range, &lr->start, "start line");
1009 if (*range == '+' || *range == '-') {
1010 const char c = *range++;
1012 err = parse_line_num(&range, &lr->end, "end line");
1017 lr->end += lr->start;
1019 * Adjust the number of lines here.
1020 * If the number of lines == 1, the
1021 * the end of line should be equal to
1022 * the start of line.
1028 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1031 if (lr->start > lr->end) {
1032 semantic_error("Start line must be smaller"
1033 " than end line.\n");
1036 if (*range != '\0') {
1037 semantic_error("Tailing with invalid str '%s'.\n", range);
1042 file = strchr(name, '@');
1045 lr->file = strdup(++file);
1046 if (lr->file == NULL) {
1050 lr->function = name;
1051 } else if (strchr(name, '.'))
1054 lr->function = name;
1062 /* Check the name is good for event/group */
1063 static bool check_event_name(const char *name)
1065 if (!isalpha(*name) && *name != '_')
1067 while (*++name != '\0') {
1068 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1074 /* Parse probepoint definition. */
1075 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1077 struct perf_probe_point *pp = &pev->point;
1080 bool file_spec = false;
1083 * perf probe [EVENT=]SRC[:LN|;PTN]
1084 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1086 * TODO:Group name support
1089 ptr = strpbrk(arg, ";=@+%");
1090 if (ptr && *ptr == '=') { /* Event name */
1093 if (strchr(arg, ':')) {
1094 semantic_error("Group name is not supported yet.\n");
1097 if (!check_event_name(arg)) {
1098 semantic_error("%s is bad for event name -it must "
1099 "follow C symbol-naming rule.\n", arg);
1102 pev->event = strdup(arg);
1103 if (pev->event == NULL)
1110 * Check arg is function or file name and copy it.
1112 * We consider arg to be a file spec if and only if it satisfies
1113 * all of the below criteria::
1114 * - it does not include any of "+@%",
1115 * - it includes one of ":;", and
1116 * - it has a period '.' in the name.
1118 * Otherwise, we consider arg to be a function specification.
1120 if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
1121 /* This is a file spec if it includes a '.' before ; or : */
1122 if (memchr(arg, '.', ptr - arg))
1126 ptr = strpbrk(arg, ";:+@%");
1141 /* Parse other options */
1145 if (c == ';') { /* Lazy pattern must be the last part */
1146 pp->lazy_line = strdup(arg);
1147 if (pp->lazy_line == NULL)
1151 ptr = strpbrk(arg, ";:+@%");
1157 case ':': /* Line number */
1158 pp->line = strtoul(arg, &tmp, 0);
1160 semantic_error("There is non-digit char"
1161 " in line number.\n");
1165 case '+': /* Byte offset from a symbol */
1166 pp->offset = strtoul(arg, &tmp, 0);
1168 semantic_error("There is non-digit character"
1173 case '@': /* File name */
1175 semantic_error("SRC@SRC is not allowed.\n");
1178 pp->file = strdup(arg);
1179 if (pp->file == NULL)
1182 case '%': /* Probe places */
1183 if (strcmp(arg, "return") == 0) {
1185 } else { /* Others not supported yet */
1186 semantic_error("%%%s is not supported.\n", arg);
1190 default: /* Buggy case */
1191 pr_err("This program has a bug at %s:%d.\n",
1192 __FILE__, __LINE__);
1198 /* Exclusion check */
1199 if (pp->lazy_line && pp->line) {
1200 semantic_error("Lazy pattern can't be used with"
1205 if (pp->lazy_line && pp->offset) {
1206 semantic_error("Lazy pattern can't be used with offset.\n");
1210 if (pp->line && pp->offset) {
1211 semantic_error("Offset can't be used with line number.\n");
1215 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1216 semantic_error("File always requires line number or "
1221 if (pp->offset && !pp->function) {
1222 semantic_error("Offset requires an entry function.\n");
1226 if (pp->retprobe && !pp->function) {
1227 semantic_error("Return probe requires an entry function.\n");
1231 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1232 semantic_error("Offset/Line/Lazy pattern can't be used with "
1237 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1238 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1243 /* Parse perf-probe event argument */
1244 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1246 char *tmp, *goodname;
1247 struct perf_probe_arg_field **fieldp;
1249 pr_debug("parsing arg: %s into ", str);
1251 tmp = strchr(str, '=');
1253 arg->name = strndup(str, tmp - str);
1254 if (arg->name == NULL)
1256 pr_debug("name:%s ", arg->name);
1260 tmp = strchr(str, ':');
1261 if (tmp) { /* Type setting */
1263 arg->type = strdup(tmp + 1);
1264 if (arg->type == NULL)
1266 pr_debug("type:%s ", arg->type);
1269 tmp = strpbrk(str, "-.[");
1270 if (!is_c_varname(str) || !tmp) {
1271 /* A variable, register, symbol or special value */
1272 arg->var = strdup(str);
1273 if (arg->var == NULL)
1275 pr_debug("%s\n", arg->var);
1279 /* Structure fields or array element */
1280 arg->var = strndup(str, tmp - str);
1281 if (arg->var == NULL)
1283 goodname = arg->var;
1284 pr_debug("%s, ", arg->var);
1285 fieldp = &arg->field;
1288 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1289 if (*fieldp == NULL)
1291 if (*tmp == '[') { /* Array */
1293 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1294 (*fieldp)->ref = true;
1295 if (*tmp != ']' || tmp == str + 1) {
1296 semantic_error("Array index must be a"
1303 } else { /* Structure */
1306 (*fieldp)->ref = false;
1307 } else if (tmp[1] == '>') {
1309 (*fieldp)->ref = true;
1311 semantic_error("Argument parse error: %s\n",
1315 tmp = strpbrk(str, "-.[");
1318 (*fieldp)->name = strndup(str, tmp - str);
1319 if ((*fieldp)->name == NULL)
1322 goodname = (*fieldp)->name;
1323 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1324 fieldp = &(*fieldp)->next;
1327 (*fieldp)->name = strdup(str);
1328 if ((*fieldp)->name == NULL)
1331 goodname = (*fieldp)->name;
1332 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1334 /* If no name is specified, set the last field name (not array index)*/
1336 arg->name = strdup(goodname);
1337 if (arg->name == NULL)
1343 /* Parse perf-probe event command */
1344 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1347 int argc, i, ret = 0;
1349 argv = argv_split(cmd, &argc);
1351 pr_debug("Failed to split arguments.\n");
1354 if (argc - 1 > MAX_PROBE_ARGS) {
1355 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1359 /* Parse probe point */
1360 ret = parse_perf_probe_point(argv[0], pev);
1364 /* Copy arguments and ensure return probe has no C argument */
1365 pev->nargs = argc - 1;
1366 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1367 if (pev->args == NULL) {
1371 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1372 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1374 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1375 semantic_error("You can't specify local variable for"
1386 /* Return true if this perf_probe_event requires debuginfo */
1387 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1391 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1394 for (i = 0; i < pev->nargs; i++)
1395 if (is_c_varname(pev->args[i].var))
1401 /* Parse probe_events event into struct probe_point */
1402 static int parse_probe_trace_command(const char *cmd,
1403 struct probe_trace_event *tev)
1405 struct probe_trace_point *tp = &tev->point;
1408 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1412 pr_debug("Parsing probe_events: %s\n", cmd);
1413 argv = argv_split(cmd, &argc);
1415 pr_debug("Failed to split arguments.\n");
1419 semantic_error("Too few probe arguments.\n");
1424 /* Scan event and group name. */
1425 argv0_str = strdup(argv[0]);
1426 if (argv0_str == NULL) {
1430 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1431 fmt2_str = strtok_r(NULL, "/", &fmt);
1432 fmt3_str = strtok_r(NULL, " \t", &fmt);
1433 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1434 || fmt3_str == NULL) {
1435 semantic_error("Failed to parse event name: %s\n", argv[0]);
1440 tev->group = strdup(fmt2_str);
1441 tev->event = strdup(fmt3_str);
1442 if (tev->group == NULL || tev->event == NULL) {
1446 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1448 tp->retprobe = (pr == 'r');
1450 /* Scan module name(if there), function name and offset */
1451 p = strchr(argv[1], ':');
1453 tp->module = strndup(argv[1], p - argv[1]);
1457 fmt1_str = strtok_r(p, "+", &fmt);
1458 if (fmt1_str[0] == '0') /* only the address started with 0x */
1459 tp->address = strtoul(fmt1_str, NULL, 0);
1461 /* Only the symbol-based probe has offset */
1462 tp->symbol = strdup(fmt1_str);
1463 if (tp->symbol == NULL) {
1467 fmt2_str = strtok_r(NULL, "", &fmt);
1468 if (fmt2_str == NULL)
1471 tp->offset = strtoul(fmt2_str, NULL, 10);
1474 tev->nargs = argc - 2;
1475 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1476 if (tev->args == NULL) {
1480 for (i = 0; i < tev->nargs; i++) {
1481 p = strchr(argv[i + 2], '=');
1482 if (p) /* We don't need which register is assigned. */
1486 tev->args[i].name = strdup(argv[i + 2]);
1487 /* TODO: parse regs and offset */
1488 tev->args[i].value = strdup(p);
1489 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1501 /* Compose only probe arg */
1502 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
1504 struct perf_probe_arg_field *field = pa->field;
1508 if (pa->name && pa->var)
1509 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
1511 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
1518 if (field->name[0] == '[')
1519 ret = e_snprintf(tmp, len, "%s", field->name);
1521 ret = e_snprintf(tmp, len, "%s%s",
1522 field->ref ? "->" : ".", field->name);
1527 field = field->next;
1531 ret = e_snprintf(tmp, len, ":%s", pa->type);
1540 pr_debug("Failed to synthesize perf probe argument: %d\n", ret);
1544 /* Compose only probe point (not argument) */
1545 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1548 char offs[32] = "", line[32] = "", file[32] = "";
1551 buf = zalloc(MAX_CMDLEN);
1557 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
1562 ret = e_snprintf(line, 32, ":%d", pp->line);
1570 tmp = strchr(pp->file + len - 30, '/');
1571 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1573 ret = e_snprintf(file, 32, "@%s", tmp);
1579 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
1580 offs, pp->retprobe ? "%return" : "", line,
1583 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
1589 pr_debug("Failed to synthesize perf probe point: %d\n", ret);
1595 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1600 buf = synthesize_perf_probe_point(&pev->point);
1605 for (i = 0; i < pev->nargs; i++) {
1606 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
1619 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1620 char **buf, size_t *buflen,
1625 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1631 ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
1643 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1644 char *buf, size_t buflen)
1646 struct probe_trace_arg_ref *ref = arg->ref;
1650 /* Argument name or separator */
1652 ret = e_snprintf(buf, buflen, " %s=", arg->name);
1654 ret = e_snprintf(buf, buflen, " ");
1660 /* Special case: @XXX */
1661 if (arg->value[0] == '@' && arg->ref)
1664 /* Dereferencing arguments */
1666 depth = __synthesize_probe_trace_arg_ref(ref, &buf,
1672 /* Print argument value */
1673 if (arg->value[0] == '@' && arg->ref)
1674 ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
1677 ret = e_snprintf(buf, buflen, "%s", arg->value);
1685 ret = e_snprintf(buf, buflen, ")");
1691 /* Print argument type */
1693 ret = e_snprintf(buf, buflen, ":%s", arg->type);
1702 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1704 struct probe_trace_point *tp = &tev->point;
1708 buf = zalloc(MAX_CMDLEN);
1712 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
1713 tev->group, tev->event);
1717 /* Uprobes must have tp->address and tp->module */
1718 if (tev->uprobes && (!tp->address || !tp->module))
1721 /* Use the tp->address for uprobes */
1723 ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s:0x%lx",
1724 tp->module, tp->address);
1726 ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s%s+%lu",
1727 tp->module ?: "", tp->module ? ":" : "",
1728 tp->symbol, tp->offset);
1734 for (i = 0; i < tev->nargs; i++) {
1735 ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
1748 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
1749 struct perf_probe_point *pp,
1752 struct symbol *sym = NULL;
1758 map = dso__new_map(tp->module);
1762 sym = map__find_symbol(map, addr, NULL);
1764 addr = kernel_get_symbol_address_by_name(tp->symbol, true);
1767 sym = __find_kernel_function(addr, &map);
1773 pp->retprobe = tp->retprobe;
1774 pp->offset = addr - map->unmap_ip(map, sym->start);
1775 pp->function = strdup(sym->name);
1776 ret = pp->function ? 0 : -ENOMEM;
1779 if (map && !is_kprobe) {
1780 dso__delete(map->dso);
1787 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
1788 struct perf_probe_point *pp,
1794 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
1797 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
1801 pr_debug("Failed to find probe point from both of dwarf and map.\n");
1804 pp->function = strdup(tp->symbol);
1805 pp->offset = tp->offset;
1806 } else if (!tp->module && !is_kprobe) {
1807 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
1810 pp->function = strdup(buf);
1813 if (pp->function == NULL)
1816 pp->retprobe = tp->retprobe;
1821 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1822 struct perf_probe_event *pev, bool is_kprobe)
1827 /* Convert event/group name */
1828 pev->event = strdup(tev->event);
1829 pev->group = strdup(tev->group);
1830 if (pev->event == NULL || pev->group == NULL)
1833 /* Convert trace_point to probe_point */
1834 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
1838 /* Convert trace_arg to probe_arg */
1839 pev->nargs = tev->nargs;
1840 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1841 if (pev->args == NULL)
1843 for (i = 0; i < tev->nargs && ret >= 0; i++) {
1844 if (tev->args[i].name)
1845 pev->args[i].name = strdup(tev->args[i].name);
1847 ret = synthesize_probe_trace_arg(&tev->args[i],
1849 pev->args[i].name = strdup(buf);
1851 if (pev->args[i].name == NULL && ret >= 0)
1856 clear_perf_probe_event(pev);
1861 void clear_perf_probe_event(struct perf_probe_event *pev)
1863 struct perf_probe_arg_field *field, *next;
1869 clear_perf_probe_point(&pev->point);
1871 for (i = 0; i < pev->nargs; i++) {
1872 free(pev->args[i].name);
1873 free(pev->args[i].var);
1874 free(pev->args[i].type);
1875 field = pev->args[i].field;
1878 zfree(&field->name);
1884 memset(pev, 0, sizeof(*pev));
1887 static void clear_probe_trace_event(struct probe_trace_event *tev)
1889 struct probe_trace_arg_ref *ref, *next;
1894 free(tev->point.symbol);
1895 free(tev->point.module);
1896 for (i = 0; i < tev->nargs; i++) {
1897 free(tev->args[i].name);
1898 free(tev->args[i].value);
1899 free(tev->args[i].type);
1900 ref = tev->args[i].ref;
1908 memset(tev, 0, sizeof(*tev));
1911 static void print_open_warning(int err, bool is_kprobe)
1913 char sbuf[STRERR_BUFSIZE];
1915 if (err == -ENOENT) {
1919 config = "CONFIG_UPROBE_EVENTS";
1921 config = "CONFIG_KPROBE_EVENTS";
1923 pr_warning("%cprobe_events file does not exist"
1924 " - please rebuild kernel with %s.\n",
1925 is_kprobe ? 'k' : 'u', config);
1926 } else if (err == -ENOTSUP)
1927 pr_warning("Tracefs or debugfs is not mounted.\n");
1929 pr_warning("Failed to open %cprobe_events: %s\n",
1930 is_kprobe ? 'k' : 'u',
1931 strerror_r(-err, sbuf, sizeof(sbuf)));
1934 static void print_both_open_warning(int kerr, int uerr)
1936 /* Both kprobes and uprobes are disabled, warn it. */
1937 if (kerr == -ENOTSUP && uerr == -ENOTSUP)
1938 pr_warning("Tracefs or debugfs is not mounted.\n");
1939 else if (kerr == -ENOENT && uerr == -ENOENT)
1940 pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS "
1941 "or/and CONFIG_UPROBE_EVENTS.\n");
1943 char sbuf[STRERR_BUFSIZE];
1944 pr_warning("Failed to open kprobe events: %s.\n",
1945 strerror_r(-kerr, sbuf, sizeof(sbuf)));
1946 pr_warning("Failed to open uprobe events: %s.\n",
1947 strerror_r(-uerr, sbuf, sizeof(sbuf)));
1951 static int open_probe_events(const char *trace_file, bool readwrite)
1954 const char *__debugfs;
1955 const char *tracing_dir = "";
1958 __debugfs = tracefs_find_mountpoint();
1959 if (__debugfs == NULL) {
1960 tracing_dir = "tracing/";
1962 __debugfs = debugfs_find_mountpoint();
1963 if (__debugfs == NULL)
1967 ret = e_snprintf(buf, PATH_MAX, "%s/%s%s",
1968 __debugfs, tracing_dir, trace_file);
1970 pr_debug("Opening %s write=%d\n", buf, readwrite);
1971 if (readwrite && !probe_event_dry_run)
1972 ret = open(buf, O_RDWR, O_APPEND);
1974 ret = open(buf, O_RDONLY, 0);
1982 static int open_kprobe_events(bool readwrite)
1984 return open_probe_events("kprobe_events", readwrite);
1987 static int open_uprobe_events(bool readwrite)
1989 return open_probe_events("uprobe_events", readwrite);
1992 /* Get raw string list of current kprobe_events or uprobe_events */
1993 static struct strlist *get_probe_trace_command_rawlist(int fd)
1997 char buf[MAX_CMDLEN];
2001 sl = strlist__new(true, NULL);
2003 fp = fdopen(dup(fd), "r");
2005 p = fgets(buf, MAX_CMDLEN, fp);
2009 idx = strlen(p) - 1;
2012 ret = strlist__add(sl, buf);
2014 pr_debug("strlist__add failed (%d)\n", ret);
2015 strlist__delete(sl);
2024 struct kprobe_blacklist_node {
2025 struct list_head list;
2026 unsigned long start;
2031 static void kprobe_blacklist__delete(struct list_head *blacklist)
2033 struct kprobe_blacklist_node *node;
2035 while (!list_empty(blacklist)) {
2036 node = list_first_entry(blacklist,
2037 struct kprobe_blacklist_node, list);
2038 list_del(&node->list);
2044 static int kprobe_blacklist__load(struct list_head *blacklist)
2046 struct kprobe_blacklist_node *node;
2047 const char *__debugfs = debugfs_find_mountpoint();
2048 char buf[PATH_MAX], *p;
2052 if (__debugfs == NULL)
2055 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2059 fp = fopen(buf, "r");
2064 while (fgets(buf, PATH_MAX, fp)) {
2065 node = zalloc(sizeof(*node));
2070 INIT_LIST_HEAD(&node->list);
2071 list_add_tail(&node->list, blacklist);
2072 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2076 p = strchr(buf, '\t');
2079 if (p[strlen(p) - 1] == '\n')
2080 p[strlen(p) - 1] = '\0';
2082 p = (char *)"unknown";
2083 node->symbol = strdup(p);
2084 if (!node->symbol) {
2088 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2089 node->start, node->end, node->symbol);
2093 kprobe_blacklist__delete(blacklist);
2099 static struct kprobe_blacklist_node *
2100 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2101 unsigned long address)
2103 struct kprobe_blacklist_node *node;
2105 list_for_each_entry(node, blacklist, list) {
2106 if (node->start <= address && address <= node->end)
2114 static int show_perf_probe_event(struct perf_probe_event *pev,
2121 /* Synthesize only event probe point */
2122 place = synthesize_perf_probe_point(&pev->point);
2126 ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
2130 pr_info(" %-20s (on %s", buf, place);
2132 pr_info(" in %s", module);
2134 if (pev->nargs > 0) {
2136 for (i = 0; i < pev->nargs; i++) {
2137 ret = synthesize_perf_probe_arg(&pev->args[i],
2141 pr_info(" %s", buf);
2149 static int __show_perf_probe_events(int fd, bool is_kprobe)
2152 struct probe_trace_event tev;
2153 struct perf_probe_event pev;
2154 struct strlist *rawlist;
2155 struct str_node *ent;
2157 memset(&tev, 0, sizeof(tev));
2158 memset(&pev, 0, sizeof(pev));
2160 rawlist = get_probe_trace_command_rawlist(fd);
2164 strlist__for_each(ent, rawlist) {
2165 ret = parse_probe_trace_command(ent->s, &tev);
2167 ret = convert_to_perf_probe_event(&tev, &pev,
2170 ret = show_perf_probe_event(&pev,
2173 clear_perf_probe_event(&pev);
2174 clear_probe_trace_event(&tev);
2178 strlist__delete(rawlist);
2183 /* List up current perf-probe events */
2184 int show_perf_probe_events(void)
2186 int kp_fd, up_fd, ret;
2190 ret = init_symbol_maps(false);
2194 kp_fd = open_kprobe_events(false);
2196 ret = __show_perf_probe_events(kp_fd, true);
2202 up_fd = open_uprobe_events(false);
2203 if (kp_fd < 0 && up_fd < 0) {
2204 print_both_open_warning(kp_fd, up_fd);
2210 ret = __show_perf_probe_events(up_fd, false);
2218 /* Get current perf-probe event names */
2219 static struct strlist *get_probe_trace_event_names(int fd, bool include_group)
2222 struct strlist *sl, *rawlist;
2223 struct str_node *ent;
2224 struct probe_trace_event tev;
2227 memset(&tev, 0, sizeof(tev));
2228 rawlist = get_probe_trace_command_rawlist(fd);
2231 sl = strlist__new(true, NULL);
2232 strlist__for_each(ent, rawlist) {
2233 ret = parse_probe_trace_command(ent->s, &tev);
2236 if (include_group) {
2237 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
2240 ret = strlist__add(sl, buf);
2242 ret = strlist__add(sl, tev.event);
2243 clear_probe_trace_event(&tev);
2247 strlist__delete(rawlist);
2250 strlist__delete(sl);
2256 static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
2259 char *buf = synthesize_probe_trace_command(tev);
2260 char sbuf[STRERR_BUFSIZE];
2263 pr_debug("Failed to synthesize probe trace event.\n");
2267 pr_debug("Writing event: %s\n", buf);
2268 if (!probe_event_dry_run) {
2269 ret = write(fd, buf, strlen(buf));
2272 pr_warning("Failed to write event: %s\n",
2273 strerror_r(errno, sbuf, sizeof(sbuf)));
2280 static int get_new_event_name(char *buf, size_t len, const char *base,
2281 struct strlist *namelist, bool allow_suffix)
2289 ret = e_snprintf(buf, len, "%s", base);
2291 pr_debug("snprintf() failed: %d\n", ret);
2294 if (!strlist__has_entry(namelist, buf))
2297 if (!allow_suffix) {
2298 pr_warning("Error: event \"%s\" already exists. "
2299 "(Use -f to force duplicates.)\n", base);
2303 /* Try to add suffix */
2304 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2305 ret = e_snprintf(buf, len, "%s_%d", base, i);
2307 pr_debug("snprintf() failed: %d\n", ret);
2310 if (!strlist__has_entry(namelist, buf))
2313 if (i == MAX_EVENT_INDEX) {
2314 pr_warning("Too many events are on the same function.\n");
2321 /* Warn if the current kernel's uprobe implementation is old */
2322 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2325 char *buf = synthesize_probe_trace_command(tev);
2327 /* Old uprobe event doesn't support memory dereference */
2328 if (!tev->uprobes || tev->nargs == 0 || !buf)
2331 for (i = 0; i < tev->nargs; i++)
2332 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2333 pr_warning("Please upgrade your kernel to at least "
2334 "3.14 to have access to feature %s\n",
2335 tev->args[i].value);
2342 static int __add_probe_trace_events(struct perf_probe_event *pev,
2343 struct probe_trace_event *tevs,
2344 int ntevs, bool allow_suffix)
2347 struct probe_trace_event *tev = NULL;
2349 const char *event, *group;
2350 struct strlist *namelist;
2351 LIST_HEAD(blacklist);
2352 struct kprobe_blacklist_node *node;
2355 fd = open_uprobe_events(true);
2357 fd = open_kprobe_events(true);
2360 print_open_warning(fd, !pev->uprobes);
2364 /* Get current event names */
2365 namelist = get_probe_trace_event_names(fd, false);
2367 pr_debug("Failed to get current event list.\n");
2370 /* Get kprobe blacklist if exists */
2371 if (!pev->uprobes) {
2372 ret = kprobe_blacklist__load(&blacklist);
2374 pr_debug("No kprobe blacklist support, ignored\n");
2378 pr_info("Added new event%s\n", (ntevs > 1) ? "s:" : ":");
2379 for (i = 0; i < ntevs; i++) {
2381 /* Ensure that the address is NOT blacklisted */
2382 node = kprobe_blacklist__find_by_address(&blacklist,
2383 tev->point.address);
2385 pr_warning("Warning: Skipped probing on blacklisted function: %s\n", node->symbol);
2392 if (pev->point.function)
2393 event = pev->point.function;
2395 event = tev->point.symbol;
2399 group = PERFPROBE_GROUP;
2401 /* Get an unused new event name */
2402 ret = get_new_event_name(buf, 64, event,
2403 namelist, allow_suffix);
2408 tev->event = strdup(event);
2409 tev->group = strdup(group);
2410 if (tev->event == NULL || tev->group == NULL) {
2414 ret = write_probe_trace_event(fd, tev);
2417 /* Add added event name to namelist */
2418 strlist__add(namelist, event);
2420 /* Trick here - save current event/group */
2423 pev->event = tev->event;
2424 pev->group = tev->group;
2425 show_perf_probe_event(pev, tev->point.module);
2426 /* Trick here - restore current event/group */
2427 pev->event = (char *)event;
2428 pev->group = (char *)group;
2431 * Probes after the first probe which comes from same
2432 * user input are always allowed to add suffix, because
2433 * there might be several addresses corresponding to
2436 allow_suffix = true;
2438 if (ret == -EINVAL && pev->uprobes)
2439 warn_uprobe_event_compat(tev);
2441 /* Note that it is possible to skip all events because of blacklist */
2442 if (ret >= 0 && tev->event) {
2443 /* Show how to use the event. */
2444 pr_info("\nYou can now use it in all perf tools, such as:\n\n");
2445 pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
2449 kprobe_blacklist__delete(&blacklist);
2450 strlist__delete(namelist);
2455 static int find_probe_functions(struct map *map, char *name)
2460 map__for_each_symbol_by_name(map, name, sym) {
2467 #define strdup_or_goto(str, label) \
2468 ({ char *__p = strdup(str); if (!__p) goto label; __p; })
2470 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2471 struct probe_trace_event *tev __maybe_unused,
2472 struct map *map __maybe_unused) { }
2475 * Find probe function addresses from map.
2476 * Return an error or the number of found probe_trace_event
2478 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2479 struct probe_trace_event **tevs,
2480 int max_tevs, const char *target)
2482 struct map *map = NULL;
2483 struct ref_reloc_sym *reloc_sym = NULL;
2485 struct probe_trace_event *tev;
2486 struct perf_probe_point *pp = &pev->point;
2487 struct probe_trace_point *tp;
2488 int num_matched_functions;
2491 map = get_target_map(target, pev->uprobes);
2498 * Load matched symbols: Since the different local symbols may have
2499 * same name but different addresses, this lists all the symbols.
2501 num_matched_functions = find_probe_functions(map, pp->function);
2502 if (num_matched_functions == 0) {
2503 pr_err("Failed to find symbol %s in %s\n", pp->function,
2504 target ? : "kernel");
2507 } else if (num_matched_functions > max_tevs) {
2508 pr_err("Too many functions matched in %s\n",
2509 target ? : "kernel");
2514 if (!pev->uprobes && !pp->retprobe) {
2515 reloc_sym = kernel_get_ref_reloc_sym();
2517 pr_warning("Relocated base symbol is not found!\n");
2523 /* Setup result trace-probe-events */
2524 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2532 map__for_each_symbol_by_name(map, pp->function, sym) {
2533 tev = (*tevs) + ret;
2535 if (ret == num_matched_functions) {
2536 pr_warning("Too many symbols are listed. Skip it.\n");
2541 if (pp->offset > sym->end - sym->start) {
2542 pr_warning("Offset %ld is bigger than the size of %s\n",
2543 pp->offset, sym->name);
2547 /* Add one probe point */
2548 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2550 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2551 tp->offset = tp->address - reloc_sym->addr;
2553 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2554 tp->offset = pp->offset;
2556 tp->retprobe = pp->retprobe;
2558 tev->point.module = strdup_or_goto(target, nomem_out);
2559 tev->uprobes = pev->uprobes;
2560 tev->nargs = pev->nargs;
2562 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2564 if (tev->args == NULL)
2567 for (i = 0; i < tev->nargs; i++) {
2568 if (pev->args[i].name)
2570 strdup_or_goto(pev->args[i].name,
2573 tev->args[i].value = strdup_or_goto(pev->args[i].var,
2575 if (pev->args[i].type)
2577 strdup_or_goto(pev->args[i].type,
2580 arch__fix_tev_from_maps(pev, tev, map);
2584 put_target_map(map, pev->uprobes);
2590 clear_probe_trace_events(*tevs, num_matched_functions);
2595 bool __weak arch__prefers_symtab(void) { return false; }
2597 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
2598 struct probe_trace_event **tevs,
2599 int max_tevs, const char *target)
2603 if (pev->uprobes && !pev->group) {
2604 /* Replace group name if not given */
2605 ret = convert_exec_to_group(target, &pev->group);
2607 pr_warning("Failed to make a group name.\n");
2612 if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
2613 ret = find_probe_trace_events_from_map(pev, tevs, max_tevs, target);
2615 return ret; /* Found in symbol table */
2618 /* Convert perf_probe_event with debuginfo */
2619 ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, target);
2621 return ret; /* Found in debuginfo or got an error */
2623 return find_probe_trace_events_from_map(pev, tevs, max_tevs, target);
2626 struct __event_package {
2627 struct perf_probe_event *pev;
2628 struct probe_trace_event *tevs;
2632 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
2633 int max_tevs, bool force_add)
2636 struct __event_package *pkgs;
2639 pkgs = zalloc(sizeof(struct __event_package) * npevs);
2644 ret = init_symbol_maps(pevs->uprobes);
2650 /* Loop 1: convert all events */
2651 for (i = 0; i < npevs; i++) {
2652 pkgs[i].pev = &pevs[i];
2653 /* Convert with or without debuginfo */
2654 ret = convert_to_probe_trace_events(pkgs[i].pev,
2657 pkgs[i].pev->target);
2660 pkgs[i].ntevs = ret;
2663 /* Loop 2: add all events */
2664 for (i = 0; i < npevs; i++) {
2665 ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
2666 pkgs[i].ntevs, force_add);
2671 /* Loop 3: cleanup and free trace events */
2672 for (i = 0; i < npevs; i++) {
2673 for (j = 0; j < pkgs[i].ntevs; j++)
2674 clear_probe_trace_event(&pkgs[i].tevs[j]);
2675 zfree(&pkgs[i].tevs);
2683 static int __del_trace_probe_event(int fd, struct str_node *ent)
2689 /* Convert from perf-probe event to trace-probe event */
2690 ret = e_snprintf(buf, 128, "-:%s", ent->s);
2694 p = strchr(buf + 2, ':');
2696 pr_debug("Internal error: %s should have ':' but not.\n",
2703 pr_debug("Writing event: %s\n", buf);
2704 ret = write(fd, buf, strlen(buf));
2710 pr_info("Removed event: %s\n", ent->s);
2713 pr_warning("Failed to delete event: %s\n",
2714 strerror_r(-ret, buf, sizeof(buf)));
2718 static int del_trace_probe_event(int fd, const char *buf,
2719 struct strlist *namelist)
2721 struct str_node *ent, *n;
2724 if (strpbrk(buf, "*?")) { /* Glob-exp */
2725 strlist__for_each_safe(ent, n, namelist)
2726 if (strglobmatch(ent->s, buf)) {
2727 ret = __del_trace_probe_event(fd, ent);
2730 strlist__remove(namelist, ent);
2733 ent = strlist__find(namelist, buf);
2735 ret = __del_trace_probe_event(fd, ent);
2737 strlist__remove(namelist, ent);
2744 int del_perf_probe_events(struct strlist *dellist)
2746 int ret = -1, ret2, ufd = -1, kfd = -1;
2748 const char *group, *event;
2750 struct str_node *ent;
2751 struct strlist *namelist = NULL, *unamelist = NULL;
2753 /* Get current event names */
2754 kfd = open_kprobe_events(true);
2756 namelist = get_probe_trace_event_names(kfd, true);
2758 ufd = open_uprobe_events(true);
2760 unamelist = get_probe_trace_event_names(ufd, true);
2762 if (kfd < 0 && ufd < 0) {
2763 print_both_open_warning(kfd, ufd);
2767 if (namelist == NULL && unamelist == NULL) {
2772 strlist__for_each(ent, dellist) {
2773 str = strdup(ent->s);
2778 pr_debug("Parsing: %s\n", str);
2779 p = strchr(str, ':');
2789 if (event && *event == '.')
2792 ret = e_snprintf(buf, 128, "%s:%s", group, event);
2794 pr_err("Failed to copy event.");
2799 pr_debug("Group: %s, Event: %s\n", group, event);
2802 ret = ret2 = -ENOENT;
2804 ret = del_trace_probe_event(kfd, buf, namelist);
2806 if ((ret >= 0 || ret == -ENOENT) && unamelist)
2807 ret2 = del_trace_probe_event(ufd, buf, unamelist);
2809 /* Since we can remove probes which already removed, don't check it */
2810 if (ret == -ENOENT && ret2 == -ENOENT)
2811 pr_debug("Event \"%s\" does not exist.\n", buf);
2812 else if (ret < 0 || ret2 < 0) {
2821 strlist__delete(namelist);
2826 strlist__delete(unamelist);
2833 /* TODO: don't use a global variable for filter ... */
2834 static struct strfilter *available_func_filter;
2837 * If a symbol corresponds to a function with global binding and
2838 * matches filter return 0. For all others return 1.
2840 static int filter_available_functions(struct map *map __maybe_unused,
2843 if (strfilter__compare(available_func_filter, sym->name))
2848 int show_available_funcs(const char *target, struct strfilter *_filter,
2854 ret = init_symbol_maps(user);
2858 /* Get a symbol map */
2860 map = dso__new_map(target);
2862 map = kernel_get_module_map(target);
2864 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
2868 /* Load symbols with given filter */
2869 available_func_filter = _filter;
2870 if (map__load(map, filter_available_functions)) {
2871 pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
2874 if (!dso__sorted_by_name(map->dso, map->type))
2875 dso__sort_by_name(map->dso, map->type);
2877 /* Show all (filtered) symbols */
2879 dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
2882 dso__delete(map->dso);