1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * probe-event.c : perf-probe definition to probe_events format converter
5 * Written by Masami Hiramatsu <mhiramat@redhat.com>
9 #include <sys/utsname.h>
10 #include <sys/types.h>
24 #include "namespaces.h"
26 #include "strfilter.h"
31 #include "map_groups.h"
33 #include <api/fs/fs.h>
34 #include "trace-event.h" /* For __maybe_unused */
35 #include "probe-event.h"
36 #include "probe-finder.h"
37 #include "probe-file.h"
42 #include <subcmd/pager.h>
43 #include <linux/ctype.h>
44 #include <linux/zalloc.h>
46 #define PERFPROBE_GROUP "probe"
48 bool probe_event_dry_run; /* Dry run flag */
49 struct probe_conf probe_conf;
51 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
53 int e_snprintf(char *str, size_t size, const char *format, ...)
58 ret = vsnprintf(str, size, format, ap);
65 static struct machine *host_machine;
67 /* Initialize symbol maps and path of vmlinux/modules */
68 int init_probe_symbol_maps(bool user_only)
72 symbol_conf.sort_by_name = true;
73 symbol_conf.allow_aliases = true;
74 ret = symbol__init(NULL);
76 pr_debug("Failed to init symbol map.\n");
80 if (host_machine || user_only) /* already initialized */
83 if (symbol_conf.vmlinux_name)
84 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
86 host_machine = machine__new_host();
88 pr_debug("machine__new_host() failed.\n");
94 pr_warning("Failed to init vmlinux path.\n");
98 void exit_probe_symbol_maps(void)
100 machine__delete(host_machine);
105 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
107 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
109 struct map *map = machine__kernel_map(host_machine);
111 if (map__load(map) < 0)
114 kmap = map__kmap(map);
117 return kmap->ref_reloc_sym;
120 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
121 bool reloc, bool reladdr)
123 struct ref_reloc_sym *reloc_sym;
127 /* ref_reloc_sym is just a label. Need a special fix*/
128 reloc_sym = kernel_get_ref_reloc_sym();
129 if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
130 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
132 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map);
135 *addr = map->unmap_ip(map, sym->start) -
136 ((reloc) ? 0 : map->reloc) -
137 ((reladdr) ? map->start : 0);
142 static struct map *kernel_get_module_map(const char *module)
144 struct maps *maps = machine__kernel_maps(host_machine);
147 /* A file path -- this is an offline module */
148 if (module && strchr(module, '/'))
149 return dso__new_map(module);
152 pos = machine__kernel_map(host_machine);
153 return map__get(pos);
156 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
157 /* short_name is "[module]" */
158 if (strncmp(pos->dso->short_name + 1, module,
159 pos->dso->short_name_len - 2) == 0 &&
160 module[pos->dso->short_name_len - 2] == '\0') {
161 return map__get(pos);
167 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
169 /* Init maps of given executable or kernel */
173 map = dso__new_map(target);
175 map->dso->nsinfo = nsinfo__get(nsi);
178 return kernel_get_module_map(target);
182 static int convert_exec_to_group(const char *exec, char **result)
184 char *ptr1, *ptr2, *exec_copy;
188 exec_copy = strdup(exec);
192 ptr1 = basename(exec_copy);
198 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
199 if (!isalnum(*ptr2) && *ptr2 != '_') {
205 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1);
209 *result = strdup(buf);
210 ret = *result ? 0 : -ENOMEM;
217 static void clear_perf_probe_point(struct perf_probe_point *pp)
220 zfree(&pp->function);
221 zfree(&pp->lazy_line);
224 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
228 for (i = 0; i < ntevs; i++)
229 clear_probe_trace_event(tevs + i);
232 static bool kprobe_blacklist__listed(unsigned long address);
233 static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
238 /* Get the address of _etext for checking non-probable text symbol */
239 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr,
242 if (ret == 0 && etext_addr < address)
243 pr_warning("%s is out of .text, skip it.\n", symbol);
244 else if (kprobe_blacklist__listed(address))
245 pr_warning("%s is blacklisted function, skip it.\n", symbol);
253 * @module can be module name of module file path. In case of path,
254 * inspect elf and find out what is actual module name.
255 * Caller has to free mod_name after using it.
257 static char *find_module_name(const char *module)
265 char *mod_name = NULL;
268 fd = open(module, O_RDONLY);
272 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
276 if (gelf_getehdr(elf, &ehdr) == NULL)
279 sec = elf_section_by_name(elf, &ehdr, &shdr,
280 ".gnu.linkonce.this_module", NULL);
284 data = elf_getdata(sec, NULL);
285 if (!data || !data->d_buf)
290 * '.gnu.linkonce.this_module' section of kernel module elf directly
291 * maps to 'struct module' from linux/module.h. This section contains
292 * actual module name which will be used by kernel after loading it.
293 * But, we cannot use 'struct module' here since linux/module.h is not
294 * exposed to user-space. Offset of 'name' has remained same from long
295 * time, so hardcoding it here.
297 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
299 else /* expect ELFCLASS64 by default */
302 mod_name = strdup((char *)data->d_buf + name_offset);
311 #ifdef HAVE_DWARF_SUPPORT
313 static int kernel_get_module_dso(const char *module, struct dso **pdso)
317 const char *vmlinux_name;
321 char module_name[128];
323 snprintf(module_name, sizeof(module_name), "[%s]", module);
324 map = map_groups__find_by_name(&host_machine->kmaps, module_name);
329 pr_debug("Failed to find module %s.\n", module);
333 map = machine__kernel_map(host_machine);
336 vmlinux_name = symbol_conf.vmlinux_name;
339 ret = dso__load_vmlinux(dso, map, vmlinux_name, false);
341 ret = dso__load_vmlinux_path(dso, map);
348 * Some binaries like glibc have special symbols which are on the symbol
349 * table, but not in the debuginfo. If we can find the address of the
350 * symbol from map, we can translate the address back to the probe point.
352 static int find_alternative_probe_point(struct debuginfo *dinfo,
353 struct perf_probe_point *pp,
354 struct perf_probe_point *result,
355 const char *target, struct nsinfo *nsi,
358 struct map *map = NULL;
363 /* This can work only for function-name based one */
364 if (!pp->function || pp->file)
367 map = get_target_map(target, nsi, uprobes);
371 /* Find the address of given function */
372 map__for_each_symbol_by_name(map, pp->function, sym) {
374 address = sym->start;
376 address = map->unmap_ip(map, sym->start) - map->reloc;
383 pr_debug("Symbol %s address found : %" PRIx64 "\n",
384 pp->function, address);
386 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
389 ret = (!ret) ? -ENOENT : ret;
391 result->offset += pp->offset;
392 result->line += pp->line;
393 result->retprobe = pp->retprobe;
403 static int get_alternative_probe_event(struct debuginfo *dinfo,
404 struct perf_probe_event *pev,
405 struct perf_probe_point *tmp)
409 memcpy(tmp, &pev->point, sizeof(*tmp));
410 memset(&pev->point, 0, sizeof(pev->point));
411 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
412 pev->nsi, pev->uprobes);
414 memcpy(&pev->point, tmp, sizeof(*tmp));
419 static int get_alternative_line_range(struct debuginfo *dinfo,
420 struct line_range *lr,
421 const char *target, bool user)
423 struct perf_probe_point pp = { .function = lr->function,
426 struct perf_probe_point result;
429 memset(&result, 0, sizeof(result));
431 if (lr->end != INT_MAX)
432 len = lr->end - lr->start;
433 ret = find_alternative_probe_point(dinfo, &pp, &result,
436 lr->function = result.function;
437 lr->file = result.file;
438 lr->start = result.line;
439 if (lr->end != INT_MAX)
440 lr->end = lr->start + len;
441 clear_perf_probe_point(&pp);
446 /* Open new debuginfo of given module */
447 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
450 const char *path = module;
451 char reason[STRERR_BUFSIZE];
452 struct debuginfo *ret = NULL;
453 struct dso *dso = NULL;
457 if (!module || !strchr(module, '/')) {
458 err = kernel_get_module_dso(module, &dso);
460 if (!dso || dso->load_errno == 0) {
461 if (!str_error_r(-err, reason, STRERR_BUFSIZE))
462 strcpy(reason, "(unknown)");
464 dso__strerror_load(dso, reason, STRERR_BUFSIZE);
467 pr_err("Module %s is not loaded, please specify its full path name.\n", module);
469 pr_err("Failed to find the path for the kernel: %s\n", reason);
473 path = dso->long_name;
475 nsinfo__mountns_enter(nsi, &nsc);
476 ret = debuginfo__new(path);
477 if (!ret && !silent) {
478 pr_warning("The %s file has no debug information.\n", path);
479 if (!module || !strtailcmp(path, ".ko"))
480 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
482 pr_warning("Rebuild with -g, ");
483 pr_warning("or install an appropriate debuginfo package.\n");
485 nsinfo__mountns_exit(&nsc);
489 /* For caching the last debuginfo */
490 static struct debuginfo *debuginfo_cache;
491 static char *debuginfo_cache_path;
493 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
495 const char *path = module;
497 /* If the module is NULL, it should be the kernel. */
501 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path))
504 /* Copy module path */
505 free(debuginfo_cache_path);
506 debuginfo_cache_path = strdup(path);
507 if (!debuginfo_cache_path) {
508 debuginfo__delete(debuginfo_cache);
509 debuginfo_cache = NULL;
513 debuginfo_cache = open_debuginfo(module, NULL, silent);
514 if (!debuginfo_cache)
515 zfree(&debuginfo_cache_path);
517 return debuginfo_cache;
520 static void debuginfo_cache__exit(void)
522 debuginfo__delete(debuginfo_cache);
523 debuginfo_cache = NULL;
524 zfree(&debuginfo_cache_path);
528 static int get_text_start_address(const char *exec, unsigned long *address,
534 int fd, ret = -ENOENT;
537 nsinfo__mountns_enter(nsi, &nsc);
538 fd = open(exec, O_RDONLY);
539 nsinfo__mountns_exit(&nsc);
543 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
549 if (gelf_getehdr(elf, &ehdr) == NULL)
552 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL))
555 *address = shdr.sh_addr - shdr.sh_offset;
566 * Convert trace point to probe point with debuginfo
568 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
569 struct perf_probe_point *pp,
572 struct debuginfo *dinfo = NULL;
573 unsigned long stext = 0;
574 u64 addr = tp->address;
577 /* convert the address to dwarf address */
583 ret = get_text_start_address(tp->module, &stext, NULL);
587 } else if (tp->symbol) {
588 /* If the module is given, this returns relative address */
589 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr,
590 false, !!tp->module);
596 pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
597 tp->module ? : "kernel");
599 dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
601 ret = debuginfo__find_probe_point(dinfo,
602 (unsigned long)addr, pp);
607 pp->retprobe = tp->retprobe;
611 pr_debug("Failed to find corresponding probes from debuginfo.\n");
612 return ret ? : -ENOENT;
615 /* Adjust symbol name and address */
616 static int post_process_probe_trace_point(struct probe_trace_point *tp,
617 struct map *map, unsigned long offs)
620 u64 addr = tp->address - offs;
622 sym = map__find_symbol(map, addr);
626 if (strcmp(sym->name, tp->symbol)) {
627 /* If we have no realname, use symbol for it */
629 tp->realname = tp->symbol;
632 tp->symbol = strdup(sym->name);
636 tp->offset = addr - sym->start;
643 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
644 * and generate new symbols with suffixes such as .constprop.N or .isra.N
645 * etc. Since those symbols are not recorded in DWARF, we have to find
646 * correct generated symbols from offline ELF binary.
647 * For online kernel or uprobes we don't need this because those are
648 * rebased on _text, or already a section relative address.
651 post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
652 int ntevs, const char *pathname)
655 unsigned long stext = 0;
658 /* Prepare a map for offline binary */
659 map = dso__new_map(pathname);
660 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
661 pr_warning("Failed to get ELF symbols for %s\n", pathname);
665 for (i = 0; i < ntevs; i++) {
666 ret = post_process_probe_trace_point(&tevs[i].point,
676 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
677 int ntevs, const char *exec,
681 unsigned long stext = 0;
686 ret = get_text_start_address(exec, &stext, nsi);
690 for (i = 0; i < ntevs && ret >= 0; i++) {
691 /* point.address is the address of point.symbol + point.offset */
692 tevs[i].point.address -= stext;
693 tevs[i].point.module = strdup(exec);
694 if (!tevs[i].point.module) {
698 tevs[i].uprobes = true;
705 post_process_module_probe_trace_events(struct probe_trace_event *tevs,
706 int ntevs, const char *module,
707 struct debuginfo *dinfo)
709 Dwarf_Addr text_offs = 0;
711 char *mod_name = NULL;
717 map = get_target_map(module, NULL, false);
718 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
719 pr_warning("Failed to get ELF symbols for %s\n", module);
723 mod_name = find_module_name(module);
724 for (i = 0; i < ntevs; i++) {
725 ret = post_process_probe_trace_point(&tevs[i].point,
726 map, (unsigned long)text_offs);
729 tevs[i].point.module =
730 strdup(mod_name ? mod_name : module);
731 if (!tevs[i].point.module) {
744 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
747 struct ref_reloc_sym *reloc_sym;
751 /* Skip post process if the target is an offline kernel */
752 if (symbol_conf.ignore_vmlinux_buildid)
753 return post_process_offline_probe_trace_events(tevs, ntevs,
754 symbol_conf.vmlinux_name);
756 reloc_sym = kernel_get_ref_reloc_sym();
758 pr_warning("Relocated base symbol is not found!\n");
762 for (i = 0; i < ntevs; i++) {
763 if (!tevs[i].point.address)
765 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported())
767 /* If we found a wrong one, mark it by NULL symbol */
768 if (kprobe_warn_out_range(tevs[i].point.symbol,
769 tevs[i].point.address)) {
773 tmp = strdup(reloc_sym->name);
777 /* If we have no realname, use symbol for it */
778 if (!tevs[i].point.realname)
779 tevs[i].point.realname = tevs[i].point.symbol;
781 free(tevs[i].point.symbol);
782 tevs[i].point.symbol = tmp;
783 tevs[i].point.offset = tevs[i].point.address -
784 reloc_sym->unrelocated_addr;
790 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
791 int ntevs __maybe_unused)
795 /* Post processing the probe events */
796 static int post_process_probe_trace_events(struct perf_probe_event *pev,
797 struct probe_trace_event *tevs,
798 int ntevs, const char *module,
799 bool uprobe, struct debuginfo *dinfo)
804 ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
807 /* Currently ref_reloc_sym based probe is not for drivers */
808 ret = post_process_module_probe_trace_events(tevs, ntevs,
811 ret = post_process_kernel_probe_trace_events(tevs, ntevs);
814 arch__post_process_probe_trace_events(pev, ntevs);
819 /* Try to find perf_probe_event with debuginfo */
820 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
821 struct probe_trace_event **tevs)
823 bool need_dwarf = perf_probe_event_need_dwarf(pev);
824 struct perf_probe_point tmp;
825 struct debuginfo *dinfo;
828 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
832 pr_debug("Could not open debuginfo. Try to use symbols.\n");
836 pr_debug("Try to find probe point from debuginfo.\n");
837 /* Searching trace events corresponding to a probe event */
838 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
840 if (ntevs == 0) { /* Not found, retry with an alternative */
841 ret = get_alternative_probe_event(dinfo, pev, &tmp);
843 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
845 * Write back to the original probe_event for
846 * setting appropriate (user given) event name
848 clear_perf_probe_point(&pev->point);
849 memcpy(&pev->point, &tmp, sizeof(tmp));
853 if (ntevs > 0) { /* Succeeded to find trace events */
854 pr_debug("Found %d probe_trace_events.\n", ntevs);
855 ret = post_process_probe_trace_events(pev, *tevs, ntevs,
856 pev->target, pev->uprobes, dinfo);
857 if (ret < 0 || ret == ntevs) {
858 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret);
859 clear_probe_trace_events(*tevs, ntevs);
865 debuginfo__delete(dinfo);
867 if (ntevs == 0) { /* No error but failed to find probe point. */
868 pr_warning("Probe point '%s' not found.\n",
869 synthesize_perf_probe_point(&pev->point));
871 } else if (ntevs < 0) {
872 /* Error path : ntevs < 0 */
873 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
875 pr_warning("Warning: No dwarf info found in the vmlinux - "
876 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
878 pr_debug("Trying to use symbols.\n");
885 #define LINEBUF_SIZE 256
886 #define NR_ADDITIONAL_LINES 2
888 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
890 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE];
891 const char *color = show_num ? "" : PERF_COLOR_BLUE;
892 const char *prefix = NULL;
895 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
900 prefix = show_num ? "%7d " : " ";
901 color_fprintf(stdout, color, prefix, l);
903 color_fprintf(stdout, color, "%s", buf);
905 } while (strchr(buf, '\n') == NULL);
910 pr_warning("File read error: %s\n",
911 str_error_r(errno, sbuf, sizeof(sbuf)));
917 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
919 int rv = __show_one_line(fp, l, skip, show_num);
921 pr_warning("Source file is shorter than expected.\n");
927 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
928 #define show_one_line(f,l) _show_one_line(f,l,false,false)
929 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
930 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
933 * Show line-range always requires debuginfo to find source file and
936 static int __show_line_range(struct line_range *lr, const char *module,
941 struct debuginfo *dinfo;
945 char sbuf[STRERR_BUFSIZE];
947 /* Search a line range */
948 dinfo = open_debuginfo(module, NULL, false);
952 ret = debuginfo__find_line_range(dinfo, lr);
953 if (!ret) { /* Not found, retry with an alternative */
954 ret = get_alternative_line_range(dinfo, lr, module, user);
956 ret = debuginfo__find_line_range(dinfo, lr);
958 debuginfo__delete(dinfo);
959 if (ret == 0 || ret == -ENOENT) {
960 pr_warning("Specified source line is not found.\n");
962 } else if (ret < 0) {
963 pr_warning("Debuginfo analysis failed.\n");
967 /* Convert source file path */
969 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
971 /* Free old path when new path is assigned */
976 pr_warning("Failed to find source file path.\n");
983 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
984 lr->start - lr->offset);
986 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
988 fp = fopen(lr->path, "r");
990 pr_warning("Failed to open %s: %s\n", lr->path,
991 str_error_r(errno, sbuf, sizeof(sbuf)));
994 /* Skip to starting line number */
995 while (l < lr->start) {
996 ret = skip_one_line(fp, l++);
1001 intlist__for_each_entry(ln, lr->line_list) {
1002 for (; ln->i > l; l++) {
1003 ret = show_one_line(fp, l - lr->offset);
1007 ret = show_one_line_with_num(fp, l++ - lr->offset);
1012 if (lr->end == INT_MAX)
1013 lr->end = l + NR_ADDITIONAL_LINES;
1014 while (l <= lr->end) {
1015 ret = show_one_line_or_eof(fp, l++ - lr->offset);
1024 int show_line_range(struct line_range *lr, const char *module,
1025 struct nsinfo *nsi, bool user)
1028 struct nscookie nsc;
1030 ret = init_probe_symbol_maps(user);
1033 nsinfo__mountns_enter(nsi, &nsc);
1034 ret = __show_line_range(lr, module, user);
1035 nsinfo__mountns_exit(&nsc);
1036 exit_probe_symbol_maps();
1041 static int show_available_vars_at(struct debuginfo *dinfo,
1042 struct perf_probe_event *pev,
1043 struct strfilter *_filter)
1047 struct str_node *node;
1048 struct variable_list *vls = NULL, *vl;
1049 struct perf_probe_point tmp;
1052 buf = synthesize_perf_probe_point(&pev->point);
1055 pr_debug("Searching variables at %s\n", buf);
1057 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
1058 if (!ret) { /* Not found, retry with an alternative */
1059 ret = get_alternative_probe_event(dinfo, pev, &tmp);
1061 ret = debuginfo__find_available_vars_at(dinfo, pev,
1063 /* Release the old probe_point */
1064 clear_perf_probe_point(&tmp);
1068 if (ret == 0 || ret == -ENOENT) {
1069 pr_err("Failed to find the address of %s\n", buf);
1072 pr_warning("Debuginfo analysis failed.\n");
1076 /* Some variables are found */
1077 fprintf(stdout, "Available variables at %s\n", buf);
1078 for (i = 0; i < ret; i++) {
1081 * A probe point might be converted to
1082 * several trace points.
1084 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
1086 zfree(&vl->point.symbol);
1089 strlist__for_each_entry(node, vl->vars) {
1090 var = strchr(node->s, '\t') + 1;
1091 if (strfilter__compare(_filter, var)) {
1092 fprintf(stdout, "\t\t%s\n", node->s);
1096 strlist__delete(vl->vars);
1099 fprintf(stdout, "\t\t(No matched variables)\n");
1107 /* Show available variables on given probe point */
1108 int show_available_vars(struct perf_probe_event *pevs, int npevs,
1109 struct strfilter *_filter)
1112 struct debuginfo *dinfo;
1114 ret = init_probe_symbol_maps(pevs->uprobes);
1118 dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
1126 for (i = 0; i < npevs && ret >= 0; i++)
1127 ret = show_available_vars_at(dinfo, &pevs[i], _filter);
1129 debuginfo__delete(dinfo);
1131 exit_probe_symbol_maps();
1135 #else /* !HAVE_DWARF_SUPPORT */
1137 static void debuginfo_cache__exit(void)
1142 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
1143 struct perf_probe_point *pp __maybe_unused,
1144 bool is_kprobe __maybe_unused)
1149 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
1150 struct probe_trace_event **tevs __maybe_unused)
1152 if (perf_probe_event_need_dwarf(pev)) {
1153 pr_warning("Debuginfo-analysis is not supported.\n");
1160 int show_line_range(struct line_range *lr __maybe_unused,
1161 const char *module __maybe_unused,
1162 struct nsinfo *nsi __maybe_unused,
1163 bool user __maybe_unused)
1165 pr_warning("Debuginfo-analysis is not supported.\n");
1169 int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
1170 int npevs __maybe_unused,
1171 struct strfilter *filter __maybe_unused)
1173 pr_warning("Debuginfo-analysis is not supported.\n");
1178 void line_range__clear(struct line_range *lr)
1180 zfree(&lr->function);
1183 zfree(&lr->comp_dir);
1184 intlist__delete(lr->line_list);
1187 int line_range__init(struct line_range *lr)
1189 memset(lr, 0, sizeof(*lr));
1190 lr->line_list = intlist__new(NULL);
1197 static int parse_line_num(char **ptr, int *val, const char *what)
1199 const char *start = *ptr;
1202 *val = strtol(*ptr, ptr, 0);
1203 if (errno || *ptr == start) {
1204 semantic_error("'%s' is not a valid number.\n", what);
1210 /* Check the name is good for event, group or function */
1211 static bool is_c_func_name(const char *name)
1213 if (!isalpha(*name) && *name != '_')
1215 while (*++name != '\0') {
1216 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1223 * Stuff 'lr' according to the line range described by 'arg'.
1224 * The line range syntax is described by:
1226 * SRC[:SLN[+NUM|-ELN]]
1227 * FNC[@SRC][:SLN[+NUM|-ELN]]
1229 int parse_line_range_desc(const char *arg, struct line_range *lr)
1231 char *range, *file, *name = strdup(arg);
1240 range = strchr(name, ':');
1244 err = parse_line_num(&range, &lr->start, "start line");
1248 if (*range == '+' || *range == '-') {
1249 const char c = *range++;
1251 err = parse_line_num(&range, &lr->end, "end line");
1256 lr->end += lr->start;
1258 * Adjust the number of lines here.
1259 * If the number of lines == 1, the
1260 * the end of line should be equal to
1261 * the start of line.
1267 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
1270 if (lr->start > lr->end) {
1271 semantic_error("Start line must be smaller"
1272 " than end line.\n");
1275 if (*range != '\0') {
1276 semantic_error("Tailing with invalid str '%s'.\n", range);
1281 file = strchr(name, '@');
1284 lr->file = strdup(++file);
1285 if (lr->file == NULL) {
1289 lr->function = name;
1290 } else if (strchr(name, '/') || strchr(name, '.'))
1292 else if (is_c_func_name(name))/* We reuse it for checking funcname */
1293 lr->function = name;
1294 else { /* Invalid name */
1295 semantic_error("'%s' is not a valid function name.\n", name);
1306 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
1310 ptr = strpbrk_esc(*arg, ":");
1313 if (!pev->sdt && !is_c_func_name(*arg))
1315 pev->group = strdup_esc(*arg);
1322 pev->event = strdup_esc(*arg);
1323 if (pev->event == NULL)
1326 if (!pev->sdt && !is_c_func_name(pev->event)) {
1330 semantic_error("%s is bad for event name -it must "
1331 "follow C symbol-naming rule.\n", *arg);
1337 /* Parse probepoint definition. */
1338 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
1340 struct perf_probe_point *pp = &pev->point;
1343 bool file_spec = false;
1348 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1349 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1350 * perf probe %[GRP:]SDT_EVENT
1355 if (is_sdt_event(arg)) {
1361 ptr = strpbrk_esc(arg, ";=@+%");
1365 semantic_error("%s must be an SDT name.\n",
1369 /* This must be a target file name or build id */
1370 tmp = build_id_cache__complement(ptr + 1);
1372 pev->target = build_id_cache__origname(tmp);
1375 pev->target = strdup_esc(ptr + 1);
1380 ret = parse_perf_probe_event_name(&arg, pev);
1382 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0)
1388 if (ptr && *ptr == '=') { /* Event name */
1391 ret = parse_perf_probe_event_name(&arg, pev);
1399 * Check arg is function or file name and copy it.
1401 * We consider arg to be a file spec if and only if it satisfies
1402 * all of the below criteria::
1403 * - it does not include any of "+@%",
1404 * - it includes one of ":;", and
1405 * - it has a period '.' in the name.
1407 * Otherwise, we consider arg to be a function specification.
1409 if (!strpbrk_esc(arg, "+@%")) {
1410 ptr = strpbrk_esc(arg, ";:");
1411 /* This is a file spec if it includes a '.' before ; or : */
1412 if (ptr && memchr(arg, '.', ptr - arg))
1416 ptr = strpbrk_esc(arg, ";:+@%");
1425 tmp = strdup_esc(arg);
1436 * Keep pp->function even if this is absolute address,
1437 * so it can mark whether abs_address is valid.
1438 * Which make 'perf probe lib.bin 0x0' possible.
1440 * Note that checking length of tmp is not needed
1441 * because when we access tmp[1] we know tmp[0] is '0',
1442 * so tmp[1] should always valid (but could be '\0').
1444 if (tmp && !strncmp(tmp, "0x", 2)) {
1445 pp->abs_address = strtoul(pp->function, &tmp, 0);
1447 semantic_error("Invalid absolute address.\n");
1453 /* Parse other options */
1457 if (c == ';') { /* Lazy pattern must be the last part */
1458 pp->lazy_line = strdup(arg); /* let leave escapes */
1459 if (pp->lazy_line == NULL)
1463 ptr = strpbrk_esc(arg, ";:+@%");
1469 case ':': /* Line number */
1470 pp->line = strtoul(arg, &tmp, 0);
1472 semantic_error("There is non-digit char"
1473 " in line number.\n");
1477 case '+': /* Byte offset from a symbol */
1478 pp->offset = strtoul(arg, &tmp, 0);
1480 semantic_error("There is non-digit character"
1485 case '@': /* File name */
1487 semantic_error("SRC@SRC is not allowed.\n");
1490 pp->file = strdup_esc(arg);
1491 if (pp->file == NULL)
1494 case '%': /* Probe places */
1495 if (strcmp(arg, "return") == 0) {
1497 } else { /* Others not supported yet */
1498 semantic_error("%%%s is not supported.\n", arg);
1502 default: /* Buggy case */
1503 pr_err("This program has a bug at %s:%d.\n",
1504 __FILE__, __LINE__);
1510 /* Exclusion check */
1511 if (pp->lazy_line && pp->line) {
1512 semantic_error("Lazy pattern can't be used with"
1517 if (pp->lazy_line && pp->offset) {
1518 semantic_error("Lazy pattern can't be used with offset.\n");
1522 if (pp->line && pp->offset) {
1523 semantic_error("Offset can't be used with line number.\n");
1527 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
1528 semantic_error("File always requires line number or "
1533 if (pp->offset && !pp->function) {
1534 semantic_error("Offset requires an entry function.\n");
1538 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
1539 semantic_error("Offset/Line/Lazy pattern can't be used with "
1544 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1545 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
1550 /* Parse perf-probe event argument */
1551 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
1553 char *tmp, *goodname;
1554 struct perf_probe_arg_field **fieldp;
1556 pr_debug("parsing arg: %s into ", str);
1558 tmp = strchr(str, '=');
1560 arg->name = strndup(str, tmp - str);
1561 if (arg->name == NULL)
1563 pr_debug("name:%s ", arg->name);
1567 tmp = strchr(str, '@');
1568 if (tmp && tmp != str && strcmp(tmp + 1, "user")) { /* user attr */
1569 if (!user_access_is_supported()) {
1570 semantic_error("ftrace does not support user access\n");
1574 arg->user_access = true;
1575 pr_debug("user_access ");
1578 tmp = strchr(str, ':');
1579 if (tmp) { /* Type setting */
1581 arg->type = strdup(tmp + 1);
1582 if (arg->type == NULL)
1584 pr_debug("type:%s ", arg->type);
1587 tmp = strpbrk(str, "-.[");
1588 if (!is_c_varname(str) || !tmp) {
1589 /* A variable, register, symbol or special value */
1590 arg->var = strdup(str);
1591 if (arg->var == NULL)
1593 pr_debug("%s\n", arg->var);
1597 /* Structure fields or array element */
1598 arg->var = strndup(str, tmp - str);
1599 if (arg->var == NULL)
1601 goodname = arg->var;
1602 pr_debug("%s, ", arg->var);
1603 fieldp = &arg->field;
1606 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
1607 if (*fieldp == NULL)
1609 if (*tmp == '[') { /* Array */
1611 (*fieldp)->index = strtol(str + 1, &tmp, 0);
1612 (*fieldp)->ref = true;
1613 if (*tmp != ']' || tmp == str + 1) {
1614 semantic_error("Array index must be a"
1621 } else { /* Structure */
1624 (*fieldp)->ref = false;
1625 } else if (tmp[1] == '>') {
1627 (*fieldp)->ref = true;
1629 semantic_error("Argument parse error: %s\n",
1633 tmp = strpbrk(str, "-.[");
1636 (*fieldp)->name = strndup(str, tmp - str);
1637 if ((*fieldp)->name == NULL)
1640 goodname = (*fieldp)->name;
1641 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
1642 fieldp = &(*fieldp)->next;
1645 (*fieldp)->name = strdup(str);
1646 if ((*fieldp)->name == NULL)
1649 goodname = (*fieldp)->name;
1650 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
1652 /* If no name is specified, set the last field name (not array index)*/
1654 arg->name = strdup(goodname);
1655 if (arg->name == NULL)
1661 /* Parse perf-probe event command */
1662 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1665 int argc, i, ret = 0;
1667 argv = argv_split(cmd, &argc);
1669 pr_debug("Failed to split arguments.\n");
1672 if (argc - 1 > MAX_PROBE_ARGS) {
1673 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1677 /* Parse probe point */
1678 ret = parse_perf_probe_point(argv[0], pev);
1682 /* Copy arguments and ensure return probe has no C argument */
1683 pev->nargs = argc - 1;
1684 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1685 if (pev->args == NULL) {
1689 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1690 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1692 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1693 semantic_error("You can't specify local variable for"
1704 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1705 bool perf_probe_with_var(struct perf_probe_event *pev)
1709 for (i = 0; i < pev->nargs; i++)
1710 if (is_c_varname(pev->args[i].var) ||
1711 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) ||
1712 !strcmp(pev->args[i].var, PROBE_ARG_VARS))
1717 /* Return true if this perf_probe_event requires debuginfo */
1718 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1720 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1723 if (perf_probe_with_var(pev))
1729 /* Parse probe_events event into struct probe_point */
1730 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
1732 struct probe_trace_point *tp = &tev->point;
1735 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str;
1739 pr_debug("Parsing probe_events: %s\n", cmd);
1740 argv = argv_split(cmd, &argc);
1742 pr_debug("Failed to split arguments.\n");
1746 semantic_error("Too few probe arguments.\n");
1751 /* Scan event and group name. */
1752 argv0_str = strdup(argv[0]);
1753 if (argv0_str == NULL) {
1757 fmt1_str = strtok_r(argv0_str, ":", &fmt);
1758 fmt2_str = strtok_r(NULL, "/", &fmt);
1759 fmt3_str = strtok_r(NULL, " \t", &fmt);
1760 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
1761 || fmt3_str == NULL) {
1762 semantic_error("Failed to parse event name: %s\n", argv[0]);
1767 tev->group = strdup(fmt2_str);
1768 tev->event = strdup(fmt3_str);
1769 if (tev->group == NULL || tev->event == NULL) {
1773 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1775 tp->retprobe = (pr == 'r');
1777 /* Scan module name(if there), function name and offset */
1778 p = strchr(argv[1], ':');
1780 tp->module = strndup(argv[1], p - argv[1]);
1785 tev->uprobes = (tp->module[0] == '/');
1789 fmt1_str = strtok_r(p, "+", &fmt);
1790 /* only the address started with 0x */
1791 if (fmt1_str[0] == '0') {
1793 * Fix a special case:
1794 * if address == 0, kernel reports something like:
1795 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1796 * Newer kernel may fix that, but we want to
1797 * support old kernel also.
1799 if (strcmp(fmt1_str, "0x") == 0) {
1800 if (!argv[2] || strcmp(argv[2], "(null)")) {
1807 for (i = 2; argv[i + 1] != NULL; i++)
1808 argv[i] = argv[i + 1];
1813 tp->address = strtoul(fmt1_str, NULL, 0);
1815 /* Only the symbol-based probe has offset */
1816 tp->symbol = strdup(fmt1_str);
1817 if (tp->symbol == NULL) {
1821 fmt2_str = strtok_r(NULL, "", &fmt);
1822 if (fmt2_str == NULL)
1825 tp->offset = strtoul(fmt2_str, NULL, 10);
1829 fmt2_str = strchr(p, '(');
1831 tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0);
1834 tev->nargs = argc - 2;
1835 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1836 if (tev->args == NULL) {
1840 for (i = 0; i < tev->nargs; i++) {
1841 p = strchr(argv[i + 2], '=');
1842 if (p) /* We don't need which register is assigned. */
1846 tev->args[i].name = strdup(argv[i + 2]);
1847 /* TODO: parse regs and offset */
1848 tev->args[i].value = strdup(p);
1849 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1861 /* Compose only probe arg */
1862 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
1864 struct perf_probe_arg_field *field = pa->field;
1869 if (strbuf_init(&buf, 64) < 0)
1872 if (pa->name && pa->var)
1873 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
1875 err = strbuf_addstr(&buf, pa->name ?: pa->var);
1880 if (field->name[0] == '[')
1881 err = strbuf_addstr(&buf, field->name);
1883 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
1885 field = field->next;
1891 if (strbuf_addf(&buf, ":%s", pa->type) < 0)
1894 ret = strbuf_detach(&buf, NULL);
1896 strbuf_release(&buf);
1900 /* Compose only probe point (not argument) */
1901 char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1904 char *tmp, *ret = NULL;
1907 if (strbuf_init(&buf, 64) < 0)
1911 if (strbuf_addstr(&buf, pp->function) < 0)
1914 err = strbuf_addf(&buf, "+%lu", pp->offset);
1916 err = strbuf_addf(&buf, ":%d", pp->line);
1917 else if (pp->retprobe)
1918 err = strbuf_addstr(&buf, "%return");
1926 tmp = strchr(pp->file + len - 30, '/');
1927 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1929 err = strbuf_addf(&buf, "@%s", tmp);
1930 if (!err && !pp->function && pp->line)
1931 err = strbuf_addf(&buf, ":%d", pp->line);
1934 ret = strbuf_detach(&buf, NULL);
1936 strbuf_release(&buf);
1940 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1943 char *tmp, *ret = NULL;
1946 if (strbuf_init(&buf, 64))
1949 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP,
1953 tmp = synthesize_perf_probe_point(&pev->point);
1954 if (!tmp || strbuf_addstr(&buf, tmp) < 0)
1958 for (i = 0; i < pev->nargs; i++) {
1959 tmp = synthesize_perf_probe_arg(pev->args + i);
1960 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
1965 ret = strbuf_detach(&buf, NULL);
1967 strbuf_release(&buf);
1971 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1972 struct strbuf *buf, int depth)
1976 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1981 err = strbuf_addf(buf, "%+ld(", ref->offset);
1982 return (err < 0) ? err : depth;
1985 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1988 struct probe_trace_arg_ref *ref = arg->ref;
1991 /* Argument name or separator */
1993 err = strbuf_addf(buf, " %s=", arg->name);
1995 err = strbuf_addch(buf, ' ');
1999 /* Special case: @XXX */
2000 if (arg->value[0] == '@' && arg->ref)
2003 /* Dereferencing arguments */
2005 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
2010 /* Print argument value */
2011 if (arg->value[0] == '@' && arg->ref)
2012 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
2014 err = strbuf_addstr(buf, arg->value);
2017 while (!err && depth--)
2018 err = strbuf_addch(buf, ')');
2020 /* Print argument type */
2021 if (!err && arg->type)
2022 err = strbuf_addf(buf, ":%s", arg->type);
2028 synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf)
2030 struct probe_trace_point *tp = &tev->point;
2033 err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address);
2035 if (err >= 0 && tp->ref_ctr_offset) {
2036 if (!uprobe_ref_ctr_is_supported())
2038 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset);
2040 return err >= 0 ? 0 : -1;
2043 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
2045 struct probe_trace_point *tp = &tev->point;
2050 /* Uprobes must have tp->module */
2051 if (tev->uprobes && !tp->module)
2054 if (strbuf_init(&buf, 32) < 0)
2057 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
2058 tev->group, tev->event) < 0)
2061 * If tp->address == 0, then this point must be a
2062 * absolute address uprobe.
2063 * try_to_find_absolute_address() should have made
2064 * tp->symbol to "0x0".
2066 if (tev->uprobes && !tp->address) {
2067 if (!tp->symbol || strcmp(tp->symbol, "0x0"))
2071 /* Use the tp->address for uprobes */
2073 err = synthesize_uprobe_trace_def(tev, &buf);
2074 } else if (!strncmp(tp->symbol, "0x", 2)) {
2075 /* Absolute address. See try_to_find_absolute_address() */
2076 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
2077 tp->module ? ":" : "", tp->address);
2079 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
2080 tp->module ? ":" : "", tp->symbol, tp->offset);
2086 for (i = 0; i < tev->nargs; i++)
2087 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
2090 ret = strbuf_detach(&buf, NULL);
2092 strbuf_release(&buf);
2096 static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
2097 struct perf_probe_point *pp,
2100 struct symbol *sym = NULL;
2101 struct map *map = NULL;
2102 u64 addr = tp->address;
2106 map = dso__new_map(tp->module);
2109 sym = map__find_symbol(map, addr);
2111 if (tp->symbol && !addr) {
2112 if (kernel_get_symbol_address_by_name(tp->symbol,
2113 &addr, true, false) < 0)
2118 sym = machine__find_kernel_symbol(host_machine, addr, &map);
2125 pp->retprobe = tp->retprobe;
2126 pp->offset = addr - map->unmap_ip(map, sym->start);
2127 pp->function = strdup(sym->name);
2128 ret = pp->function ? 0 : -ENOMEM;
2131 if (map && !is_kprobe) {
2138 static int convert_to_perf_probe_point(struct probe_trace_point *tp,
2139 struct perf_probe_point *pp,
2145 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
2148 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
2152 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2155 pp->function = strdup(tp->symbol);
2156 pp->offset = tp->offset;
2158 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
2161 pp->function = strdup(buf);
2164 if (pp->function == NULL)
2167 pp->retprobe = tp->retprobe;
2172 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
2173 struct perf_probe_event *pev, bool is_kprobe)
2175 struct strbuf buf = STRBUF_INIT;
2178 /* Convert event/group name */
2179 pev->event = strdup(tev->event);
2180 pev->group = strdup(tev->group);
2181 if (pev->event == NULL || pev->group == NULL)
2184 /* Convert trace_point to probe_point */
2185 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
2189 /* Convert trace_arg to probe_arg */
2190 pev->nargs = tev->nargs;
2191 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
2192 if (pev->args == NULL)
2194 for (i = 0; i < tev->nargs && ret >= 0; i++) {
2195 if (tev->args[i].name)
2196 pev->args[i].name = strdup(tev->args[i].name);
2198 if ((ret = strbuf_init(&buf, 32)) < 0)
2200 ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
2201 pev->args[i].name = strbuf_detach(&buf, NULL);
2203 if (pev->args[i].name == NULL && ret >= 0)
2208 clear_perf_probe_event(pev);
2213 void clear_perf_probe_event(struct perf_probe_event *pev)
2215 struct perf_probe_arg_field *field, *next;
2220 zfree(&pev->target);
2221 clear_perf_probe_point(&pev->point);
2223 for (i = 0; i < pev->nargs; i++) {
2224 zfree(&pev->args[i].name);
2225 zfree(&pev->args[i].var);
2226 zfree(&pev->args[i].type);
2227 field = pev->args[i].field;
2230 zfree(&field->name);
2239 #define strdup_or_goto(str, label) \
2240 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2242 static int perf_probe_point__copy(struct perf_probe_point *dst,
2243 struct perf_probe_point *src)
2245 dst->file = strdup_or_goto(src->file, out_err);
2246 dst->function = strdup_or_goto(src->function, out_err);
2247 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
2248 dst->line = src->line;
2249 dst->retprobe = src->retprobe;
2250 dst->offset = src->offset;
2254 clear_perf_probe_point(dst);
2258 static int perf_probe_arg__copy(struct perf_probe_arg *dst,
2259 struct perf_probe_arg *src)
2261 struct perf_probe_arg_field *field, **ppfield;
2263 dst->name = strdup_or_goto(src->name, out_err);
2264 dst->var = strdup_or_goto(src->var, out_err);
2265 dst->type = strdup_or_goto(src->type, out_err);
2268 ppfield = &(dst->field);
2270 *ppfield = zalloc(sizeof(*field));
2273 (*ppfield)->name = strdup_or_goto(field->name, out_err);
2274 (*ppfield)->index = field->index;
2275 (*ppfield)->ref = field->ref;
2276 field = field->next;
2277 ppfield = &((*ppfield)->next);
2284 int perf_probe_event__copy(struct perf_probe_event *dst,
2285 struct perf_probe_event *src)
2289 dst->event = strdup_or_goto(src->event, out_err);
2290 dst->group = strdup_or_goto(src->group, out_err);
2291 dst->target = strdup_or_goto(src->target, out_err);
2292 dst->uprobes = src->uprobes;
2294 if (perf_probe_point__copy(&dst->point, &src->point) < 0)
2297 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
2300 dst->nargs = src->nargs;
2302 for (i = 0; i < src->nargs; i++)
2303 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
2308 clear_perf_probe_event(dst);
2312 void clear_probe_trace_event(struct probe_trace_event *tev)
2314 struct probe_trace_arg_ref *ref, *next;
2319 zfree(&tev->point.symbol);
2320 zfree(&tev->point.realname);
2321 zfree(&tev->point.module);
2322 for (i = 0; i < tev->nargs; i++) {
2323 zfree(&tev->args[i].name);
2324 zfree(&tev->args[i].value);
2325 zfree(&tev->args[i].type);
2326 ref = tev->args[i].ref;
2337 struct kprobe_blacklist_node {
2338 struct list_head list;
2339 unsigned long start;
2344 static void kprobe_blacklist__delete(struct list_head *blacklist)
2346 struct kprobe_blacklist_node *node;
2348 while (!list_empty(blacklist)) {
2349 node = list_first_entry(blacklist,
2350 struct kprobe_blacklist_node, list);
2351 list_del_init(&node->list);
2352 zfree(&node->symbol);
2357 static int kprobe_blacklist__load(struct list_head *blacklist)
2359 struct kprobe_blacklist_node *node;
2360 const char *__debugfs = debugfs__mountpoint();
2361 char buf[PATH_MAX], *p;
2365 if (__debugfs == NULL)
2368 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs);
2372 fp = fopen(buf, "r");
2377 while (fgets(buf, PATH_MAX, fp)) {
2378 node = zalloc(sizeof(*node));
2383 INIT_LIST_HEAD(&node->list);
2384 list_add_tail(&node->list, blacklist);
2385 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
2389 p = strchr(buf, '\t');
2392 if (p[strlen(p) - 1] == '\n')
2393 p[strlen(p) - 1] = '\0';
2395 p = (char *)"unknown";
2396 node->symbol = strdup(p);
2397 if (!node->symbol) {
2401 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2402 node->start, node->end, node->symbol);
2406 kprobe_blacklist__delete(blacklist);
2412 static struct kprobe_blacklist_node *
2413 kprobe_blacklist__find_by_address(struct list_head *blacklist,
2414 unsigned long address)
2416 struct kprobe_blacklist_node *node;
2418 list_for_each_entry(node, blacklist, list) {
2419 if (node->start <= address && address < node->end)
2426 static LIST_HEAD(kprobe_blacklist);
2428 static void kprobe_blacklist__init(void)
2430 if (!list_empty(&kprobe_blacklist))
2433 if (kprobe_blacklist__load(&kprobe_blacklist) < 0)
2434 pr_debug("No kprobe blacklist support, ignored\n");
2437 static void kprobe_blacklist__release(void)
2439 kprobe_blacklist__delete(&kprobe_blacklist);
2442 static bool kprobe_blacklist__listed(unsigned long address)
2444 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
2447 static int perf_probe_event__sprintf(const char *group, const char *event,
2448 struct perf_probe_event *pev,
2450 struct strbuf *result)
2455 if (asprintf(&buf, "%s:%s", group, event) < 0)
2457 ret = strbuf_addf(result, " %-20s (on ", buf);
2462 /* Synthesize only event probe point */
2463 buf = synthesize_perf_probe_point(&pev->point);
2466 ret = strbuf_addstr(result, buf);
2470 ret = strbuf_addf(result, " in %s", module);
2472 if (!ret && pev->nargs > 0) {
2473 ret = strbuf_add(result, " with", 5);
2474 for (i = 0; !ret && i < pev->nargs; i++) {
2475 buf = synthesize_perf_probe_arg(&pev->args[i]);
2478 ret = strbuf_addf(result, " %s", buf);
2483 ret = strbuf_addch(result, ')');
2489 int show_perf_probe_event(const char *group, const char *event,
2490 struct perf_probe_event *pev,
2491 const char *module, bool use_stdout)
2493 struct strbuf buf = STRBUF_INIT;
2496 ret = perf_probe_event__sprintf(group, event, pev, module, &buf);
2499 printf("%s\n", buf.buf);
2501 pr_info("%s\n", buf.buf);
2503 strbuf_release(&buf);
2508 static bool filter_probe_trace_event(struct probe_trace_event *tev,
2509 struct strfilter *filter)
2513 /* At first, check the event name itself */
2514 if (strfilter__compare(filter, tev->event))
2517 /* Next, check the combination of name and group */
2518 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
2520 return strfilter__compare(filter, tmp);
2523 static int __show_perf_probe_events(int fd, bool is_kprobe,
2524 struct strfilter *filter)
2527 struct probe_trace_event tev;
2528 struct perf_probe_event pev;
2529 struct strlist *rawlist;
2530 struct str_node *ent;
2532 memset(&tev, 0, sizeof(tev));
2533 memset(&pev, 0, sizeof(pev));
2535 rawlist = probe_file__get_rawlist(fd);
2539 strlist__for_each_entry(ent, rawlist) {
2540 ret = parse_probe_trace_command(ent->s, &tev);
2542 if (!filter_probe_trace_event(&tev, filter))
2544 ret = convert_to_perf_probe_event(&tev, &pev,
2548 ret = show_perf_probe_event(pev.group, pev.event,
2549 &pev, tev.point.module,
2553 clear_perf_probe_event(&pev);
2554 clear_probe_trace_event(&tev);
2558 strlist__delete(rawlist);
2559 /* Cleanup cached debuginfo if needed */
2560 debuginfo_cache__exit();
2565 /* List up current perf-probe events */
2566 int show_perf_probe_events(struct strfilter *filter)
2568 int kp_fd, up_fd, ret;
2572 if (probe_conf.cache)
2573 return probe_cache__show_all_caches(filter);
2575 ret = init_probe_symbol_maps(false);
2579 ret = probe_file__open_both(&kp_fd, &up_fd, 0);
2584 ret = __show_perf_probe_events(kp_fd, true, filter);
2585 if (up_fd >= 0 && ret >= 0)
2586 ret = __show_perf_probe_events(up_fd, false, filter);
2591 exit_probe_symbol_maps();
2596 static int get_new_event_name(char *buf, size_t len, const char *base,
2597 struct strlist *namelist, bool ret_event,
2605 nbase = strdup(base);
2609 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */
2610 p = strpbrk(nbase, ".@");
2611 if (p && p != nbase)
2614 /* Try no suffix number */
2615 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
2617 pr_debug("snprintf() failed: %d\n", ret);
2620 if (!strlist__has_entry(namelist, buf))
2623 if (!allow_suffix) {
2624 pr_warning("Error: event \"%s\" already exists.\n"
2625 " Hint: Remove existing event by 'perf probe -d'\n"
2626 " or force duplicates by 'perf probe -f'\n"
2627 " or set 'force=yes' in BPF source.\n",
2633 /* Try to add suffix */
2634 for (i = 1; i < MAX_EVENT_INDEX; i++) {
2635 ret = e_snprintf(buf, len, "%s_%d", nbase, i);
2637 pr_debug("snprintf() failed: %d\n", ret);
2640 if (!strlist__has_entry(namelist, buf))
2643 if (i == MAX_EVENT_INDEX) {
2644 pr_warning("Too many events are on the same function.\n");
2651 /* Final validation */
2652 if (ret >= 0 && !is_c_func_name(buf)) {
2653 pr_warning("Internal error: \"%s\" is an invalid event name.\n",
2661 /* Warn if the current kernel's uprobe implementation is old */
2662 static void warn_uprobe_event_compat(struct probe_trace_event *tev)
2665 char *buf = synthesize_probe_trace_command(tev);
2666 struct probe_trace_point *tp = &tev->point;
2668 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) {
2669 pr_warning("A semaphore is associated with %s:%s and "
2670 "seems your kernel doesn't support it.\n",
2671 tev->group, tev->event);
2674 /* Old uprobe event doesn't support memory dereference */
2675 if (!tev->uprobes || tev->nargs == 0 || !buf)
2678 for (i = 0; i < tev->nargs; i++)
2679 if (strglobmatch(tev->args[i].value, "[$@+-]*")) {
2680 pr_warning("Please upgrade your kernel to at least "
2681 "3.14 to have access to feature %s\n",
2682 tev->args[i].value);
2689 /* Set new name from original perf_probe_event and namelist */
2690 static int probe_trace_event__set_name(struct probe_trace_event *tev,
2691 struct perf_probe_event *pev,
2692 struct strlist *namelist,
2695 const char *event, *group;
2699 /* If probe_event or trace_event already have the name, reuse it */
2700 if (pev->event && !pev->sdt)
2702 else if (tev->event)
2705 /* Or generate new one from probe point */
2706 if (pev->point.function &&
2707 (strncmp(pev->point.function, "0x", 2) != 0) &&
2708 !strisglob(pev->point.function))
2709 event = pev->point.function;
2711 event = tev->point.realname;
2713 if (pev->group && !pev->sdt)
2715 else if (tev->group)
2718 group = PERFPROBE_GROUP;
2720 /* Get an unused new event name */
2721 ret = get_new_event_name(buf, 64, event, namelist,
2722 tev->point.retprobe, allow_suffix);
2728 tev->event = strdup(event);
2729 tev->group = strdup(group);
2730 if (tev->event == NULL || tev->group == NULL)
2733 /* Add added event name to namelist */
2734 strlist__add(namelist, event);
2738 static int __open_probe_file_and_namelist(bool uprobe,
2739 struct strlist **namelist)
2743 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));
2747 /* Get current event names */
2748 *namelist = probe_file__get_namelist(fd);
2750 pr_debug("Failed to get current event list.\n");
2757 static int __add_probe_trace_events(struct perf_probe_event *pev,
2758 struct probe_trace_event *tevs,
2759 int ntevs, bool allow_suffix)
2761 int i, fd[2] = {-1, -1}, up, ret;
2762 struct probe_trace_event *tev = NULL;
2763 struct probe_cache *cache = NULL;
2764 struct strlist *namelist[2] = {NULL, NULL};
2765 struct nscookie nsc;
2767 up = pev->uprobes ? 1 : 0;
2768 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
2773 for (i = 0; i < ntevs; i++) {
2775 up = tev->uprobes ? 1 : 0;
2776 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */
2777 fd[up] = __open_probe_file_and_namelist(up,
2782 /* Skip if the symbol is out of .text or blacklisted */
2783 if (!tev->point.symbol && !pev->uprobes)
2786 /* Set new name for tev (and update namelist) */
2787 ret = probe_trace_event__set_name(tev, pev, namelist[up],
2792 nsinfo__mountns_enter(pev->nsi, &nsc);
2793 ret = probe_file__add_event(fd[up], tev);
2794 nsinfo__mountns_exit(&nsc);
2799 * Probes after the first probe which comes from same
2800 * user input are always allowed to add suffix, because
2801 * there might be several addresses corresponding to
2804 allow_suffix = true;
2806 if (ret == -EINVAL && pev->uprobes)
2807 warn_uprobe_event_compat(tev);
2808 if (ret == 0 && probe_conf.cache) {
2809 cache = probe_cache__new(pev->target, pev->nsi);
2811 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
2812 probe_cache__commit(cache) < 0)
2813 pr_warning("Failed to add event to probe cache\n");
2814 probe_cache__delete(cache);
2818 for (up = 0; up < 2; up++) {
2819 strlist__delete(namelist[up]);
2826 static int find_probe_functions(struct map *map, char *name,
2827 struct symbol **syms)
2831 struct rb_node *tmp;
2832 const char *norm, *ver;
2834 bool cut_version = true;
2836 if (map__load(map) < 0)
2839 /* If user gives a version, don't cut off the version from symbols */
2840 if (strchr(name, '@'))
2841 cut_version = false;
2843 map__for_each_symbol(map, sym, tmp) {
2844 norm = arch__normalize_symbol_name(sym->name);
2849 /* We don't care about default symbol or not */
2850 ver = strchr(norm, '@');
2852 buf = strndup(norm, ver - norm);
2859 if (strglobmatch(norm, name)) {
2861 if (syms && found < probe_conf.max_probes)
2862 syms[found - 1] = sym;
2871 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
2872 struct probe_trace_event *tev __maybe_unused,
2873 struct map *map __maybe_unused,
2874 struct symbol *sym __maybe_unused) { }
2877 * Find probe function addresses from map.
2878 * Return an error or the number of found probe_trace_event
2880 static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
2881 struct probe_trace_event **tevs)
2883 struct map *map = NULL;
2884 struct ref_reloc_sym *reloc_sym = NULL;
2886 struct symbol **syms = NULL;
2887 struct probe_trace_event *tev;
2888 struct perf_probe_point *pp = &pev->point;
2889 struct probe_trace_point *tp;
2890 int num_matched_functions;
2891 int ret, i, j, skipped = 0;
2894 map = get_target_map(pev->target, pev->nsi, pev->uprobes);
2900 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes);
2907 * Load matched symbols: Since the different local symbols may have
2908 * same name but different addresses, this lists all the symbols.
2910 num_matched_functions = find_probe_functions(map, pp->function, syms);
2911 if (num_matched_functions <= 0) {
2912 pr_err("Failed to find symbol %s in %s\n", pp->function,
2913 pev->target ? : "kernel");
2916 } else if (num_matched_functions > probe_conf.max_probes) {
2917 pr_err("Too many functions matched in %s\n",
2918 pev->target ? : "kernel");
2923 /* Note that the symbols in the kmodule are not relocated */
2924 if (!pev->uprobes && !pev->target &&
2925 (!pp->retprobe || kretprobe_offset_is_supported())) {
2926 reloc_sym = kernel_get_ref_reloc_sym();
2928 pr_warning("Relocated base symbol is not found!\n");
2934 /* Setup result trace-probe-events */
2935 *tevs = zalloc(sizeof(*tev) * num_matched_functions);
2943 for (j = 0; j < num_matched_functions; j++) {
2946 tev = (*tevs) + ret;
2948 if (ret == num_matched_functions) {
2949 pr_warning("Too many symbols are listed. Skip it.\n");
2954 if (pp->offset > sym->end - sym->start) {
2955 pr_warning("Offset %ld is bigger than the size of %s\n",
2956 pp->offset, sym->name);
2960 /* Add one probe point */
2961 tp->address = map->unmap_ip(map, sym->start) + pp->offset;
2963 /* Check the kprobe (not in module) is within .text */
2964 if (!pev->uprobes && !pev->target &&
2965 kprobe_warn_out_range(sym->name, tp->address)) {
2966 tp->symbol = NULL; /* Skip it */
2968 } else if (reloc_sym) {
2969 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out);
2970 tp->offset = tp->address - reloc_sym->addr;
2972 tp->symbol = strdup_or_goto(sym->name, nomem_out);
2973 tp->offset = pp->offset;
2975 tp->realname = strdup_or_goto(sym->name, nomem_out);
2977 tp->retprobe = pp->retprobe;
2980 tev->point.module = strdup_or_goto(pev->target,
2983 mod_name = find_module_name(pev->target);
2985 strdup(mod_name ? mod_name : pev->target);
2987 if (!tev->point.module)
2991 tev->uprobes = pev->uprobes;
2992 tev->nargs = pev->nargs;
2994 tev->args = zalloc(sizeof(struct probe_trace_arg) *
2996 if (tev->args == NULL)
2999 for (i = 0; i < tev->nargs; i++) {
3000 if (pev->args[i].name)
3002 strdup_or_goto(pev->args[i].name,
3005 tev->args[i].value = strdup_or_goto(pev->args[i].var,
3007 if (pev->args[i].type)
3009 strdup_or_goto(pev->args[i].type,
3012 arch__fix_tev_from_maps(pev, tev, map, sym);
3014 if (ret == skipped) {
3027 clear_probe_trace_events(*tevs, num_matched_functions);
3032 static int try_to_find_absolute_address(struct perf_probe_event *pev,
3033 struct probe_trace_event **tevs)
3035 struct perf_probe_point *pp = &pev->point;
3036 struct probe_trace_event *tev;
3037 struct probe_trace_point *tp;
3040 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2)))
3042 if (perf_probe_event_need_dwarf(pev))
3046 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
3049 * Only one tev can be generated by this.
3051 *tevs = zalloc(sizeof(*tev));
3059 * Don't use tp->offset, use address directly, because
3060 * in synthesize_probe_trace_command() address cannot be
3063 tp->address = pev->point.abs_address;
3064 tp->retprobe = pp->retprobe;
3065 tev->uprobes = pev->uprobes;
3069 * Give it a '0x' leading symbol name.
3070 * In __add_probe_trace_events, a NULL symbol is interpreted as
3073 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
3076 /* For kprobe, check range */
3077 if ((!tev->uprobes) &&
3078 (kprobe_warn_out_range(tev->point.symbol,
3079 tev->point.address))) {
3084 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
3088 tp->module = strdup(pev->target);
3094 tev->group = strdup(pev->group);
3100 tev->event = strdup(pev->event);
3105 tev->nargs = pev->nargs;
3106 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
3110 for (i = 0; i < tev->nargs; i++)
3111 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]);
3116 clear_probe_trace_events(*tevs, 1);
3121 /* Concatinate two arrays */
3122 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
3126 ret = malloc(sz_a + sz_b);
3128 memcpy(ret, a, sz_a);
3129 memcpy(ret + sz_a, b, sz_b);
3135 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs,
3136 struct probe_trace_event **tevs2, int ntevs2)
3138 struct probe_trace_event *new_tevs;
3148 if (*ntevs + ntevs2 > probe_conf.max_probes)
3151 /* Concatinate the array of probe_trace_event */
3152 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs),
3153 *tevs2, ntevs2 * sizeof(**tevs2));
3163 clear_probe_trace_events(*tevs2, ntevs2);
3170 * Try to find probe_trace_event from given probe caches. Return the number
3171 * of cached events found, if an error occurs return the error.
3173 static int find_cached_events(struct perf_probe_event *pev,
3174 struct probe_trace_event **tevs,
3177 struct probe_cache *cache;
3178 struct probe_cache_entry *entry;
3179 struct probe_trace_event *tmp_tevs = NULL;
3183 cache = probe_cache__new(target, pev->nsi);
3184 /* Return 0 ("not found") if the target has no probe cache. */
3188 for_each_probe_cache_entry(entry, cache) {
3189 /* Skip the cache entry which has no name */
3190 if (!entry->pev.event || !entry->pev.group)
3192 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) &&
3193 strglobmatch(entry->pev.event, pev->event)) {
3194 ret = probe_cache_entry__get_event(entry, &tmp_tevs);
3196 ret = concat_probe_trace_events(tevs, &ntevs,
3202 probe_cache__delete(cache);
3204 clear_probe_trace_events(*tevs, ntevs);
3208 if (ntevs > 0 && target && target[0] == '/')
3209 pev->uprobes = true;
3215 /* Try to find probe_trace_event from all probe caches */
3216 static int find_cached_events_all(struct perf_probe_event *pev,
3217 struct probe_trace_event **tevs)
3219 struct probe_trace_event *tmp_tevs = NULL;
3220 struct strlist *bidlist;
3221 struct str_node *nd;
3226 /* Get the buildid list of all valid caches */
3227 bidlist = build_id_cache__list_all(true);
3230 pr_debug("Failed to get buildids: %d\n", ret);
3235 strlist__for_each_entry(nd, bidlist) {
3236 pathname = build_id_cache__origname(nd->s);
3237 ret = find_cached_events(pev, &tmp_tevs, pathname);
3238 /* In the case of cnt == 0, we just skip it */
3240 ret = concat_probe_trace_events(tevs, &ntevs,
3246 strlist__delete(bidlist);
3249 clear_probe_trace_events(*tevs, ntevs);
3257 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
3258 struct probe_trace_event **tevs)
3260 struct probe_cache *cache;
3261 struct probe_cache_entry *entry;
3262 struct probe_trace_event *tev;
3263 struct str_node *node;
3267 /* For SDT/cached events, we use special search functions */
3269 return find_cached_events_all(pev, tevs);
3271 return find_cached_events(pev, tevs, pev->target);
3273 cache = probe_cache__new(pev->target, pev->nsi);
3277 entry = probe_cache__find(cache, pev);
3279 /* SDT must be in the cache */
3280 ret = pev->sdt ? -ENOENT : 0;
3284 ret = strlist__nr_entries(entry->tevlist);
3285 if (ret > probe_conf.max_probes) {
3286 pr_debug("Too many entries matched in the cache of %s\n",
3287 pev->target ? : "kernel");
3292 *tevs = zalloc(ret * sizeof(*tev));
3299 strlist__for_each_entry(node, entry->tevlist) {
3300 tev = &(*tevs)[i++];
3301 ret = parse_probe_trace_command(node->s, tev);
3304 /* Set the uprobes attribute as same as original */
3305 tev->uprobes = pev->uprobes;
3310 probe_cache__delete(cache);
3314 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
3315 struct probe_trace_event **tevs)
3319 if (!pev->group && !pev->sdt) {
3320 /* Set group name if not given */
3321 if (!pev->uprobes) {
3322 pev->group = strdup(PERFPROBE_GROUP);
3323 ret = pev->group ? 0 : -ENOMEM;
3325 ret = convert_exec_to_group(pev->target, &pev->group);
3327 pr_warning("Failed to make a group name.\n");
3332 ret = try_to_find_absolute_address(pev, tevs);
3336 /* At first, we need to lookup cache entry */
3337 ret = find_probe_trace_events_from_cache(pev, tevs);
3338 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
3339 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
3341 /* Convert perf_probe_event with debuginfo */
3342 ret = try_to_find_probe_trace_events(pev, tevs);
3344 return ret; /* Found in debuginfo or got an error */
3346 return find_probe_trace_events_from_map(pev, tevs);
3349 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3353 /* Loop 1: convert all events */
3354 for (i = 0; i < npevs; i++) {
3355 /* Init kprobe blacklist if needed */
3356 if (!pevs[i].uprobes)
3357 kprobe_blacklist__init();
3358 /* Convert with or without debuginfo */
3359 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs);
3362 pevs[i].ntevs = ret;
3364 /* This just release blacklist only if allocated */
3365 kprobe_blacklist__release();
3370 static int show_probe_trace_event(struct probe_trace_event *tev)
3372 char *buf = synthesize_probe_trace_command(tev);
3375 pr_debug("Failed to synthesize probe trace event.\n");
3379 /* Showing definition always go stdout */
3380 printf("%s\n", buf);
3386 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
3388 struct strlist *namelist = strlist__new(NULL, NULL);
3389 struct probe_trace_event *tev;
3390 struct perf_probe_event *pev;
3396 for (j = 0; j < npevs && !ret; j++) {
3398 for (i = 0; i < pev->ntevs && !ret; i++) {
3399 tev = &pev->tevs[i];
3400 /* Skip if the symbol is out of .text or blacklisted */
3401 if (!tev->point.symbol && !pev->uprobes)
3404 /* Set new name for tev (and update namelist) */
3405 ret = probe_trace_event__set_name(tev, pev,
3408 ret = show_probe_trace_event(tev);
3411 strlist__delete(namelist);
3416 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3420 /* Loop 2: add all events */
3421 for (i = 0; i < npevs; i++) {
3422 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs,
3424 probe_conf.force_add);
3431 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3434 struct perf_probe_event *pev;
3436 /* Loop 3: cleanup and free trace events */
3437 for (i = 0; i < npevs; i++) {
3439 for (j = 0; j < pevs[i].ntevs; j++)
3440 clear_probe_trace_event(&pevs[i].tevs[j]);
3441 zfree(&pevs[i].tevs);
3443 nsinfo__zput(pev->nsi);
3444 clear_perf_probe_event(&pevs[i]);
3448 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
3452 ret = init_probe_symbol_maps(pevs->uprobes);
3456 ret = convert_perf_probe_events(pevs, npevs);
3458 ret = apply_perf_probe_events(pevs, npevs);
3460 cleanup_perf_probe_events(pevs, npevs);
3462 exit_probe_symbol_maps();
3466 int del_perf_probe_events(struct strfilter *filter)
3468 int ret, ret2, ufd = -1, kfd = -1;
3469 char *str = strfilter__string(filter);
3474 /* Get current event names */
3475 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
3479 ret = probe_file__del_events(kfd, filter);
3480 if (ret < 0 && ret != -ENOENT)
3483 ret2 = probe_file__del_events(ufd, filter);
3484 if (ret2 < 0 && ret2 != -ENOENT) {
3501 int show_available_funcs(const char *target, struct nsinfo *nsi,
3502 struct strfilter *_filter, bool user)
3508 ret = init_probe_symbol_maps(user);
3512 /* Get a symbol map */
3513 map = get_target_map(target, nsi, user);
3515 pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
3519 ret = map__load(map);
3522 char *str = strfilter__string(_filter);
3523 pr_err("Failed to find symbols matched to \"%s\"\n",
3527 pr_err("Failed to load symbols in %s\n",
3528 (target) ? : "kernel");
3531 if (!dso__sorted_by_name(map->dso))
3532 dso__sort_by_name(map->dso);
3534 /* Show all (filtered) symbols */
3537 for (nd = rb_first_cached(&map->dso->symbol_names); nd;
3539 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
3541 if (strfilter__compare(_filter, pos->sym.name))
3542 printf("%s\n", pos->sym.name);
3546 exit_probe_symbol_maps();
3551 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
3552 struct perf_probe_arg *pvar)
3554 tvar->value = strdup(pvar->var);
3555 if (tvar->value == NULL)
3558 tvar->type = strdup(pvar->type);
3559 if (tvar->type == NULL)
3563 tvar->name = strdup(pvar->name);
3564 if (tvar->name == NULL)