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2 * probe-event.c : perf-probe definition to probe_events format converter
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <sys/utsname.h>
24 #include <sys/types.h>
39 #include "strfilter.h"
45 #include <api/fs/fs.h>
46 #include "trace-event.h" /* For __maybe_unused */
47 #include "probe-event.h"
48 #include "probe-finder.h"
49 #include "probe-file.h"
53 #include "sane_ctype.h"
55 #define PERFPROBE_GROUP "probe"
57 bool probe_event_dry_run
; /* Dry run flag */
58 struct probe_conf probe_conf
;
60 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
62 int e_snprintf(char *str
, size_t size
, const char *format
, ...)
67 ret
= vsnprintf(str
, size
, format
, ap
);
74 static struct machine
*host_machine
;
76 /* Initialize symbol maps and path of vmlinux/modules */
77 int init_probe_symbol_maps(bool user_only
)
81 symbol_conf
.sort_by_name
= true;
82 symbol_conf
.allow_aliases
= true;
83 ret
= symbol__init(NULL
);
85 pr_debug("Failed to init symbol map.\n");
89 if (host_machine
|| user_only
) /* already initialized */
92 if (symbol_conf
.vmlinux_name
)
93 pr_debug("Use vmlinux: %s\n", symbol_conf
.vmlinux_name
);
95 host_machine
= machine__new_host();
97 pr_debug("machine__new_host() failed.\n");
103 pr_warning("Failed to init vmlinux path.\n");
107 void exit_probe_symbol_maps(void)
109 machine__delete(host_machine
);
114 static struct symbol
*__find_kernel_function_by_name(const char *name
,
117 return machine__find_kernel_function_by_name(host_machine
, name
, mapp
);
120 static struct symbol
*__find_kernel_function(u64 addr
, struct map
**mapp
)
122 return machine__find_kernel_function(host_machine
, addr
, mapp
);
125 static struct ref_reloc_sym
*kernel_get_ref_reloc_sym(void)
127 /* kmap->ref_reloc_sym should be set if host_machine is initialized */
129 struct map
*map
= machine__kernel_map(host_machine
);
131 if (map__load(map
) < 0)
134 kmap
= map__kmap(map
);
137 return kmap
->ref_reloc_sym
;
140 static int kernel_get_symbol_address_by_name(const char *name
, u64
*addr
,
141 bool reloc
, bool reladdr
)
143 struct ref_reloc_sym
*reloc_sym
;
147 /* ref_reloc_sym is just a label. Need a special fix*/
148 reloc_sym
= kernel_get_ref_reloc_sym();
149 if (reloc_sym
&& strcmp(name
, reloc_sym
->name
) == 0)
150 *addr
= (reloc
) ? reloc_sym
->addr
: reloc_sym
->unrelocated_addr
;
152 sym
= __find_kernel_function_by_name(name
, &map
);
155 *addr
= map
->unmap_ip(map
, sym
->start
) -
156 ((reloc
) ? 0 : map
->reloc
) -
157 ((reladdr
) ? map
->start
: 0);
162 static struct map
*kernel_get_module_map(const char *module
)
164 struct map_groups
*grp
= &host_machine
->kmaps
;
165 struct maps
*maps
= &grp
->maps
[MAP__FUNCTION
];
168 /* A file path -- this is an offline module */
169 if (module
&& strchr(module
, '/'))
170 return dso__new_map(module
);
175 for (pos
= maps__first(maps
); pos
; pos
= map__next(pos
)) {
176 /* short_name is "[module]" */
177 if (strncmp(pos
->dso
->short_name
+ 1, module
,
178 pos
->dso
->short_name_len
- 2) == 0 &&
179 module
[pos
->dso
->short_name_len
- 2] == '\0') {
187 struct map
*get_target_map(const char *target
, struct nsinfo
*nsi
, bool user
)
189 /* Init maps of given executable or kernel */
193 map
= dso__new_map(target
);
195 map
->dso
->nsinfo
= nsinfo__get(nsi
);
198 return kernel_get_module_map(target
);
202 static int convert_exec_to_group(const char *exec
, char **result
)
204 char *ptr1
, *ptr2
, *exec_copy
;
208 exec_copy
= strdup(exec
);
212 ptr1
= basename(exec_copy
);
218 for (ptr2
= ptr1
; *ptr2
!= '\0'; ptr2
++) {
219 if (!isalnum(*ptr2
) && *ptr2
!= '_') {
225 ret
= e_snprintf(buf
, 64, "%s_%s", PERFPROBE_GROUP
, ptr1
);
229 *result
= strdup(buf
);
230 ret
= *result
? 0 : -ENOMEM
;
237 static void clear_perf_probe_point(struct perf_probe_point
*pp
)
244 static void clear_probe_trace_events(struct probe_trace_event
*tevs
, int ntevs
)
248 for (i
= 0; i
< ntevs
; i
++)
249 clear_probe_trace_event(tevs
+ i
);
252 static bool kprobe_blacklist__listed(unsigned long address
);
253 static bool kprobe_warn_out_range(const char *symbol
, unsigned long address
)
258 /* Get the address of _etext for checking non-probable text symbol */
259 ret
= kernel_get_symbol_address_by_name("_etext", &etext_addr
,
262 if (ret
== 0 && etext_addr
< address
)
263 pr_warning("%s is out of .text, skip it.\n", symbol
);
264 else if (kprobe_blacklist__listed(address
))
265 pr_warning("%s is blacklisted function, skip it.\n", symbol
);
273 * @module can be module name of module file path. In case of path,
274 * inspect elf and find out what is actual module name.
275 * Caller has to free mod_name after using it.
277 static char *find_module_name(const char *module
)
285 char *mod_name
= NULL
;
288 fd
= open(module
, O_RDONLY
);
292 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
296 if (gelf_getehdr(elf
, &ehdr
) == NULL
)
299 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
300 ".gnu.linkonce.this_module", NULL
);
304 data
= elf_getdata(sec
, NULL
);
305 if (!data
|| !data
->d_buf
)
310 * '.gnu.linkonce.this_module' section of kernel module elf directly
311 * maps to 'struct module' from linux/module.h. This section contains
312 * actual module name which will be used by kernel after loading it.
313 * But, we cannot use 'struct module' here since linux/module.h is not
314 * exposed to user-space. Offset of 'name' has remained same from long
315 * time, so hardcoding it here.
317 if (ehdr
.e_ident
[EI_CLASS
] == ELFCLASS32
)
319 else /* expect ELFCLASS64 by default */
322 mod_name
= strdup((char *)data
->d_buf
+ name_offset
);
331 #ifdef HAVE_DWARF_SUPPORT
333 static int kernel_get_module_dso(const char *module
, struct dso
**pdso
)
337 const char *vmlinux_name
;
341 char module_name
[128];
343 snprintf(module_name
, sizeof(module_name
), "[%s]", module
);
344 map
= map_groups__find_by_name(&host_machine
->kmaps
, MAP__FUNCTION
, module_name
);
349 pr_debug("Failed to find module %s.\n", module
);
353 map
= machine__kernel_map(host_machine
);
356 vmlinux_name
= symbol_conf
.vmlinux_name
;
359 ret
= dso__load_vmlinux(dso
, map
, vmlinux_name
, false);
361 ret
= dso__load_vmlinux_path(dso
, map
);
368 * Some binaries like glibc have special symbols which are on the symbol
369 * table, but not in the debuginfo. If we can find the address of the
370 * symbol from map, we can translate the address back to the probe point.
372 static int find_alternative_probe_point(struct debuginfo
*dinfo
,
373 struct perf_probe_point
*pp
,
374 struct perf_probe_point
*result
,
375 const char *target
, struct nsinfo
*nsi
,
378 struct map
*map
= NULL
;
383 /* This can work only for function-name based one */
384 if (!pp
->function
|| pp
->file
)
387 map
= get_target_map(target
, nsi
, uprobes
);
391 /* Find the address of given function */
392 map__for_each_symbol_by_name(map
, pp
->function
, sym
) {
394 address
= sym
->start
;
396 address
= map
->unmap_ip(map
, sym
->start
) - map
->reloc
;
403 pr_debug("Symbol %s address found : %" PRIx64
"\n",
404 pp
->function
, address
);
406 ret
= debuginfo__find_probe_point(dinfo
, (unsigned long)address
,
409 ret
= (!ret
) ? -ENOENT
: ret
;
411 result
->offset
+= pp
->offset
;
412 result
->line
+= pp
->line
;
413 result
->retprobe
= pp
->retprobe
;
423 static int get_alternative_probe_event(struct debuginfo
*dinfo
,
424 struct perf_probe_event
*pev
,
425 struct perf_probe_point
*tmp
)
429 memcpy(tmp
, &pev
->point
, sizeof(*tmp
));
430 memset(&pev
->point
, 0, sizeof(pev
->point
));
431 ret
= find_alternative_probe_point(dinfo
, tmp
, &pev
->point
, pev
->target
,
432 pev
->nsi
, pev
->uprobes
);
434 memcpy(&pev
->point
, tmp
, sizeof(*tmp
));
439 static int get_alternative_line_range(struct debuginfo
*dinfo
,
440 struct line_range
*lr
,
441 const char *target
, bool user
)
443 struct perf_probe_point pp
= { .function
= lr
->function
,
446 struct perf_probe_point result
;
449 memset(&result
, 0, sizeof(result
));
451 if (lr
->end
!= INT_MAX
)
452 len
= lr
->end
- lr
->start
;
453 ret
= find_alternative_probe_point(dinfo
, &pp
, &result
,
456 lr
->function
= result
.function
;
457 lr
->file
= result
.file
;
458 lr
->start
= result
.line
;
459 if (lr
->end
!= INT_MAX
)
460 lr
->end
= lr
->start
+ len
;
461 clear_perf_probe_point(&pp
);
466 /* Open new debuginfo of given module */
467 static struct debuginfo
*open_debuginfo(const char *module
, struct nsinfo
*nsi
,
470 const char *path
= module
;
471 char reason
[STRERR_BUFSIZE
];
472 struct debuginfo
*ret
= NULL
;
473 struct dso
*dso
= NULL
;
477 if (!module
|| !strchr(module
, '/')) {
478 err
= kernel_get_module_dso(module
, &dso
);
480 if (!dso
|| dso
->load_errno
== 0) {
481 if (!str_error_r(-err
, reason
, STRERR_BUFSIZE
))
482 strcpy(reason
, "(unknown)");
484 dso__strerror_load(dso
, reason
, STRERR_BUFSIZE
);
486 pr_err("Failed to find the path for %s: %s\n",
487 module
?: "kernel", reason
);
490 path
= dso
->long_name
;
492 nsinfo__mountns_enter(nsi
, &nsc
);
493 ret
= debuginfo__new(path
);
494 if (!ret
&& !silent
) {
495 pr_warning("The %s file has no debug information.\n", path
);
496 if (!module
|| !strtailcmp(path
, ".ko"))
497 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
499 pr_warning("Rebuild with -g, ");
500 pr_warning("or install an appropriate debuginfo package.\n");
502 nsinfo__mountns_exit(&nsc
);
506 /* For caching the last debuginfo */
507 static struct debuginfo
*debuginfo_cache
;
508 static char *debuginfo_cache_path
;
510 static struct debuginfo
*debuginfo_cache__open(const char *module
, bool silent
)
512 const char *path
= module
;
514 /* If the module is NULL, it should be the kernel. */
518 if (debuginfo_cache_path
&& !strcmp(debuginfo_cache_path
, path
))
521 /* Copy module path */
522 free(debuginfo_cache_path
);
523 debuginfo_cache_path
= strdup(path
);
524 if (!debuginfo_cache_path
) {
525 debuginfo__delete(debuginfo_cache
);
526 debuginfo_cache
= NULL
;
530 debuginfo_cache
= open_debuginfo(module
, NULL
, silent
);
531 if (!debuginfo_cache
)
532 zfree(&debuginfo_cache_path
);
534 return debuginfo_cache
;
537 static void debuginfo_cache__exit(void)
539 debuginfo__delete(debuginfo_cache
);
540 debuginfo_cache
= NULL
;
541 zfree(&debuginfo_cache_path
);
545 static int get_text_start_address(const char *exec
, unsigned long *address
,
551 int fd
, ret
= -ENOENT
;
554 nsinfo__mountns_enter(nsi
, &nsc
);
555 fd
= open(exec
, O_RDONLY
);
556 nsinfo__mountns_exit(&nsc
);
560 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
566 if (gelf_getehdr(elf
, &ehdr
) == NULL
)
569 if (!elf_section_by_name(elf
, &ehdr
, &shdr
, ".text", NULL
))
572 *address
= shdr
.sh_addr
- shdr
.sh_offset
;
583 * Convert trace point to probe point with debuginfo
585 static int find_perf_probe_point_from_dwarf(struct probe_trace_point
*tp
,
586 struct perf_probe_point
*pp
,
589 struct debuginfo
*dinfo
= NULL
;
590 unsigned long stext
= 0;
591 u64 addr
= tp
->address
;
594 /* convert the address to dwarf address */
600 ret
= get_text_start_address(tp
->module
, &stext
, NULL
);
604 } else if (tp
->symbol
) {
605 /* If the module is given, this returns relative address */
606 ret
= kernel_get_symbol_address_by_name(tp
->symbol
, &addr
,
607 false, !!tp
->module
);
613 pr_debug("try to find information at %" PRIx64
" in %s\n", addr
,
614 tp
->module
? : "kernel");
616 dinfo
= debuginfo_cache__open(tp
->module
, verbose
<= 0);
618 ret
= debuginfo__find_probe_point(dinfo
,
619 (unsigned long)addr
, pp
);
624 pp
->retprobe
= tp
->retprobe
;
628 pr_debug("Failed to find corresponding probes from debuginfo.\n");
629 return ret
? : -ENOENT
;
632 /* Adjust symbol name and address */
633 static int post_process_probe_trace_point(struct probe_trace_point
*tp
,
634 struct map
*map
, unsigned long offs
)
637 u64 addr
= tp
->address
- offs
;
639 sym
= map__find_symbol(map
, addr
);
643 if (strcmp(sym
->name
, tp
->symbol
)) {
644 /* If we have no realname, use symbol for it */
646 tp
->realname
= tp
->symbol
;
649 tp
->symbol
= strdup(sym
->name
);
653 tp
->offset
= addr
- sym
->start
;
660 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
661 * and generate new symbols with suffixes such as .constprop.N or .isra.N
662 * etc. Since those symbols are not recorded in DWARF, we have to find
663 * correct generated symbols from offline ELF binary.
664 * For online kernel or uprobes we don't need this because those are
665 * rebased on _text, or already a section relative address.
668 post_process_offline_probe_trace_events(struct probe_trace_event
*tevs
,
669 int ntevs
, const char *pathname
)
672 unsigned long stext
= 0;
675 /* Prepare a map for offline binary */
676 map
= dso__new_map(pathname
);
677 if (!map
|| get_text_start_address(pathname
, &stext
, NULL
) < 0) {
678 pr_warning("Failed to get ELF symbols for %s\n", pathname
);
682 for (i
= 0; i
< ntevs
; i
++) {
683 ret
= post_process_probe_trace_point(&tevs
[i
].point
,
693 static int add_exec_to_probe_trace_events(struct probe_trace_event
*tevs
,
694 int ntevs
, const char *exec
,
698 unsigned long stext
= 0;
703 ret
= get_text_start_address(exec
, &stext
, nsi
);
707 for (i
= 0; i
< ntevs
&& ret
>= 0; i
++) {
708 /* point.address is the addres of point.symbol + point.offset */
709 tevs
[i
].point
.address
-= stext
;
710 tevs
[i
].point
.module
= strdup(exec
);
711 if (!tevs
[i
].point
.module
) {
715 tevs
[i
].uprobes
= true;
722 post_process_module_probe_trace_events(struct probe_trace_event
*tevs
,
723 int ntevs
, const char *module
,
724 struct debuginfo
*dinfo
)
726 Dwarf_Addr text_offs
= 0;
728 char *mod_name
= NULL
;
734 map
= get_target_map(module
, NULL
, false);
735 if (!map
|| debuginfo__get_text_offset(dinfo
, &text_offs
, true) < 0) {
736 pr_warning("Failed to get ELF symbols for %s\n", module
);
740 mod_name
= find_module_name(module
);
741 for (i
= 0; i
< ntevs
; i
++) {
742 ret
= post_process_probe_trace_point(&tevs
[i
].point
,
743 map
, (unsigned long)text_offs
);
746 tevs
[i
].point
.module
=
747 strdup(mod_name
? mod_name
: module
);
748 if (!tevs
[i
].point
.module
) {
761 post_process_kernel_probe_trace_events(struct probe_trace_event
*tevs
,
764 struct ref_reloc_sym
*reloc_sym
;
768 /* Skip post process if the target is an offline kernel */
769 if (symbol_conf
.ignore_vmlinux_buildid
)
770 return post_process_offline_probe_trace_events(tevs
, ntevs
,
771 symbol_conf
.vmlinux_name
);
773 reloc_sym
= kernel_get_ref_reloc_sym();
775 pr_warning("Relocated base symbol is not found!\n");
779 for (i
= 0; i
< ntevs
; i
++) {
780 if (!tevs
[i
].point
.address
)
782 if (tevs
[i
].point
.retprobe
&& !kretprobe_offset_is_supported())
784 /* If we found a wrong one, mark it by NULL symbol */
785 if (kprobe_warn_out_range(tevs
[i
].point
.symbol
,
786 tevs
[i
].point
.address
)) {
790 tmp
= strdup(reloc_sym
->name
);
794 /* If we have no realname, use symbol for it */
795 if (!tevs
[i
].point
.realname
)
796 tevs
[i
].point
.realname
= tevs
[i
].point
.symbol
;
798 free(tevs
[i
].point
.symbol
);
799 tevs
[i
].point
.symbol
= tmp
;
800 tevs
[i
].point
.offset
= tevs
[i
].point
.address
-
801 reloc_sym
->unrelocated_addr
;
807 arch__post_process_probe_trace_events(struct perf_probe_event
*pev __maybe_unused
,
808 int ntevs __maybe_unused
)
812 /* Post processing the probe events */
813 static int post_process_probe_trace_events(struct perf_probe_event
*pev
,
814 struct probe_trace_event
*tevs
,
815 int ntevs
, const char *module
,
816 bool uprobe
, struct debuginfo
*dinfo
)
821 ret
= add_exec_to_probe_trace_events(tevs
, ntevs
, module
,
824 /* Currently ref_reloc_sym based probe is not for drivers */
825 ret
= post_process_module_probe_trace_events(tevs
, ntevs
,
828 ret
= post_process_kernel_probe_trace_events(tevs
, ntevs
);
831 arch__post_process_probe_trace_events(pev
, ntevs
);
836 /* Try to find perf_probe_event with debuginfo */
837 static int try_to_find_probe_trace_events(struct perf_probe_event
*pev
,
838 struct probe_trace_event
**tevs
)
840 bool need_dwarf
= perf_probe_event_need_dwarf(pev
);
841 struct perf_probe_point tmp
;
842 struct debuginfo
*dinfo
;
845 dinfo
= open_debuginfo(pev
->target
, pev
->nsi
, !need_dwarf
);
849 pr_debug("Could not open debuginfo. Try to use symbols.\n");
853 pr_debug("Try to find probe point from debuginfo.\n");
854 /* Searching trace events corresponding to a probe event */
855 ntevs
= debuginfo__find_trace_events(dinfo
, pev
, tevs
);
857 if (ntevs
== 0) { /* Not found, retry with an alternative */
858 ret
= get_alternative_probe_event(dinfo
, pev
, &tmp
);
860 ntevs
= debuginfo__find_trace_events(dinfo
, pev
, tevs
);
862 * Write back to the original probe_event for
863 * setting appropriate (user given) event name
865 clear_perf_probe_point(&pev
->point
);
866 memcpy(&pev
->point
, &tmp
, sizeof(tmp
));
870 if (ntevs
> 0) { /* Succeeded to find trace events */
871 pr_debug("Found %d probe_trace_events.\n", ntevs
);
872 ret
= post_process_probe_trace_events(pev
, *tevs
, ntevs
,
873 pev
->target
, pev
->uprobes
, dinfo
);
874 if (ret
< 0 || ret
== ntevs
) {
875 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret
);
876 clear_probe_trace_events(*tevs
, ntevs
);
882 debuginfo__delete(dinfo
);
884 if (ntevs
== 0) { /* No error but failed to find probe point. */
885 pr_warning("Probe point '%s' not found.\n",
886 synthesize_perf_probe_point(&pev
->point
));
888 } else if (ntevs
< 0) {
889 /* Error path : ntevs < 0 */
890 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs
);
892 pr_warning("Warning: No dwarf info found in the vmlinux - "
893 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
895 pr_debug("Trying to use symbols.\n");
902 #define LINEBUF_SIZE 256
903 #define NR_ADDITIONAL_LINES 2
905 static int __show_one_line(FILE *fp
, int l
, bool skip
, bool show_num
)
907 char buf
[LINEBUF_SIZE
], sbuf
[STRERR_BUFSIZE
];
908 const char *color
= show_num
? "" : PERF_COLOR_BLUE
;
909 const char *prefix
= NULL
;
912 if (fgets(buf
, LINEBUF_SIZE
, fp
) == NULL
)
917 prefix
= show_num
? "%7d " : " ";
918 color_fprintf(stdout
, color
, prefix
, l
);
920 color_fprintf(stdout
, color
, "%s", buf
);
922 } while (strchr(buf
, '\n') == NULL
);
927 pr_warning("File read error: %s\n",
928 str_error_r(errno
, sbuf
, sizeof(sbuf
)));
934 static int _show_one_line(FILE *fp
, int l
, bool skip
, bool show_num
)
936 int rv
= __show_one_line(fp
, l
, skip
, show_num
);
938 pr_warning("Source file is shorter than expected.\n");
944 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
945 #define show_one_line(f,l) _show_one_line(f,l,false,false)
946 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
947 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
950 * Show line-range always requires debuginfo to find source file and
953 static int __show_line_range(struct line_range
*lr
, const char *module
,
958 struct debuginfo
*dinfo
;
962 char sbuf
[STRERR_BUFSIZE
];
964 /* Search a line range */
965 dinfo
= open_debuginfo(module
, NULL
, false);
969 ret
= debuginfo__find_line_range(dinfo
, lr
);
970 if (!ret
) { /* Not found, retry with an alternative */
971 ret
= get_alternative_line_range(dinfo
, lr
, module
, user
);
973 ret
= debuginfo__find_line_range(dinfo
, lr
);
975 debuginfo__delete(dinfo
);
976 if (ret
== 0 || ret
== -ENOENT
) {
977 pr_warning("Specified source line is not found.\n");
979 } else if (ret
< 0) {
980 pr_warning("Debuginfo analysis failed.\n");
984 /* Convert source file path */
986 ret
= get_real_path(tmp
, lr
->comp_dir
, &lr
->path
);
988 /* Free old path when new path is assigned */
993 pr_warning("Failed to find source file path.\n");
1000 fprintf(stdout
, "<%s@%s:%d>\n", lr
->function
, lr
->path
,
1001 lr
->start
- lr
->offset
);
1003 fprintf(stdout
, "<%s:%d>\n", lr
->path
, lr
->start
);
1005 fp
= fopen(lr
->path
, "r");
1007 pr_warning("Failed to open %s: %s\n", lr
->path
,
1008 str_error_r(errno
, sbuf
, sizeof(sbuf
)));
1011 /* Skip to starting line number */
1012 while (l
< lr
->start
) {
1013 ret
= skip_one_line(fp
, l
++);
1018 intlist__for_each_entry(ln
, lr
->line_list
) {
1019 for (; ln
->i
> l
; l
++) {
1020 ret
= show_one_line(fp
, l
- lr
->offset
);
1024 ret
= show_one_line_with_num(fp
, l
++ - lr
->offset
);
1029 if (lr
->end
== INT_MAX
)
1030 lr
->end
= l
+ NR_ADDITIONAL_LINES
;
1031 while (l
<= lr
->end
) {
1032 ret
= show_one_line_or_eof(fp
, l
++ - lr
->offset
);
1041 int show_line_range(struct line_range
*lr
, const char *module
,
1042 struct nsinfo
*nsi
, bool user
)
1045 struct nscookie nsc
;
1047 ret
= init_probe_symbol_maps(user
);
1050 nsinfo__mountns_enter(nsi
, &nsc
);
1051 ret
= __show_line_range(lr
, module
, user
);
1052 nsinfo__mountns_exit(&nsc
);
1053 exit_probe_symbol_maps();
1058 static int show_available_vars_at(struct debuginfo
*dinfo
,
1059 struct perf_probe_event
*pev
,
1060 struct strfilter
*_filter
)
1064 struct str_node
*node
;
1065 struct variable_list
*vls
= NULL
, *vl
;
1066 struct perf_probe_point tmp
;
1069 buf
= synthesize_perf_probe_point(&pev
->point
);
1072 pr_debug("Searching variables at %s\n", buf
);
1074 ret
= debuginfo__find_available_vars_at(dinfo
, pev
, &vls
);
1075 if (!ret
) { /* Not found, retry with an alternative */
1076 ret
= get_alternative_probe_event(dinfo
, pev
, &tmp
);
1078 ret
= debuginfo__find_available_vars_at(dinfo
, pev
,
1080 /* Release the old probe_point */
1081 clear_perf_probe_point(&tmp
);
1085 if (ret
== 0 || ret
== -ENOENT
) {
1086 pr_err("Failed to find the address of %s\n", buf
);
1089 pr_warning("Debuginfo analysis failed.\n");
1093 /* Some variables are found */
1094 fprintf(stdout
, "Available variables at %s\n", buf
);
1095 for (i
= 0; i
< ret
; i
++) {
1098 * A probe point might be converted to
1099 * several trace points.
1101 fprintf(stdout
, "\t@<%s+%lu>\n", vl
->point
.symbol
,
1103 zfree(&vl
->point
.symbol
);
1106 strlist__for_each_entry(node
, vl
->vars
) {
1107 var
= strchr(node
->s
, '\t') + 1;
1108 if (strfilter__compare(_filter
, var
)) {
1109 fprintf(stdout
, "\t\t%s\n", node
->s
);
1113 strlist__delete(vl
->vars
);
1116 fprintf(stdout
, "\t\t(No matched variables)\n");
1124 /* Show available variables on given probe point */
1125 int show_available_vars(struct perf_probe_event
*pevs
, int npevs
,
1126 struct strfilter
*_filter
)
1129 struct debuginfo
*dinfo
;
1131 ret
= init_probe_symbol_maps(pevs
->uprobes
);
1135 dinfo
= open_debuginfo(pevs
->target
, pevs
->nsi
, false);
1143 for (i
= 0; i
< npevs
&& ret
>= 0; i
++)
1144 ret
= show_available_vars_at(dinfo
, &pevs
[i
], _filter
);
1146 debuginfo__delete(dinfo
);
1148 exit_probe_symbol_maps();
1152 #else /* !HAVE_DWARF_SUPPORT */
1154 static void debuginfo_cache__exit(void)
1159 find_perf_probe_point_from_dwarf(struct probe_trace_point
*tp __maybe_unused
,
1160 struct perf_probe_point
*pp __maybe_unused
,
1161 bool is_kprobe __maybe_unused
)
1166 static int try_to_find_probe_trace_events(struct perf_probe_event
*pev
,
1167 struct probe_trace_event
**tevs __maybe_unused
)
1169 if (perf_probe_event_need_dwarf(pev
)) {
1170 pr_warning("Debuginfo-analysis is not supported.\n");
1177 int show_line_range(struct line_range
*lr __maybe_unused
,
1178 const char *module __maybe_unused
,
1179 struct nsinfo
*nsi __maybe_unused
,
1180 bool user __maybe_unused
)
1182 pr_warning("Debuginfo-analysis is not supported.\n");
1186 int show_available_vars(struct perf_probe_event
*pevs __maybe_unused
,
1187 int npevs __maybe_unused
,
1188 struct strfilter
*filter __maybe_unused
)
1190 pr_warning("Debuginfo-analysis is not supported.\n");
1195 void line_range__clear(struct line_range
*lr
)
1201 intlist__delete(lr
->line_list
);
1202 memset(lr
, 0, sizeof(*lr
));
1205 int line_range__init(struct line_range
*lr
)
1207 memset(lr
, 0, sizeof(*lr
));
1208 lr
->line_list
= intlist__new(NULL
);
1215 static int parse_line_num(char **ptr
, int *val
, const char *what
)
1217 const char *start
= *ptr
;
1220 *val
= strtol(*ptr
, ptr
, 0);
1221 if (errno
|| *ptr
== start
) {
1222 semantic_error("'%s' is not a valid number.\n", what
);
1228 /* Check the name is good for event, group or function */
1229 static bool is_c_func_name(const char *name
)
1231 if (!isalpha(*name
) && *name
!= '_')
1233 while (*++name
!= '\0') {
1234 if (!isalpha(*name
) && !isdigit(*name
) && *name
!= '_')
1241 * Stuff 'lr' according to the line range described by 'arg'.
1242 * The line range syntax is described by:
1244 * SRC[:SLN[+NUM|-ELN]]
1245 * FNC[@SRC][:SLN[+NUM|-ELN]]
1247 int parse_line_range_desc(const char *arg
, struct line_range
*lr
)
1249 char *range
, *file
, *name
= strdup(arg
);
1258 range
= strchr(name
, ':');
1262 err
= parse_line_num(&range
, &lr
->start
, "start line");
1266 if (*range
== '+' || *range
== '-') {
1267 const char c
= *range
++;
1269 err
= parse_line_num(&range
, &lr
->end
, "end line");
1274 lr
->end
+= lr
->start
;
1276 * Adjust the number of lines here.
1277 * If the number of lines == 1, the
1278 * the end of line should be equal to
1279 * the start of line.
1285 pr_debug("Line range is %d to %d\n", lr
->start
, lr
->end
);
1288 if (lr
->start
> lr
->end
) {
1289 semantic_error("Start line must be smaller"
1290 " than end line.\n");
1293 if (*range
!= '\0') {
1294 semantic_error("Tailing with invalid str '%s'.\n", range
);
1299 file
= strchr(name
, '@');
1302 lr
->file
= strdup(++file
);
1303 if (lr
->file
== NULL
) {
1307 lr
->function
= name
;
1308 } else if (strchr(name
, '/') || strchr(name
, '.'))
1310 else if (is_c_func_name(name
))/* We reuse it for checking funcname */
1311 lr
->function
= name
;
1312 else { /* Invalid name */
1313 semantic_error("'%s' is not a valid function name.\n", name
);
1324 static int parse_perf_probe_event_name(char **arg
, struct perf_probe_event
*pev
)
1328 ptr
= strchr(*arg
, ':');
1331 if (!pev
->sdt
&& !is_c_func_name(*arg
))
1333 pev
->group
= strdup(*arg
);
1339 if (!pev
->sdt
&& !is_c_func_name(*arg
)) {
1341 semantic_error("%s is bad for event name -it must "
1342 "follow C symbol-naming rule.\n", *arg
);
1345 pev
->event
= strdup(*arg
);
1346 if (pev
->event
== NULL
)
1352 /* Parse probepoint definition. */
1353 static int parse_perf_probe_point(char *arg
, struct perf_probe_event
*pev
)
1355 struct perf_probe_point
*pp
= &pev
->point
;
1358 bool file_spec
= false;
1363 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
1364 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
1365 * perf probe %[GRP:]SDT_EVENT
1370 if (is_sdt_event(arg
)) {
1376 ptr
= strpbrk(arg
, ";=@+%");
1380 semantic_error("%s must be an SDT name.\n",
1384 /* This must be a target file name or build id */
1385 tmp
= build_id_cache__complement(ptr
+ 1);
1387 pev
->target
= build_id_cache__origname(tmp
);
1390 pev
->target
= strdup(ptr
+ 1);
1395 ret
= parse_perf_probe_event_name(&arg
, pev
);
1397 if (asprintf(&pev
->point
.function
, "%%%s", pev
->event
) < 0)
1403 if (ptr
&& *ptr
== '=') { /* Event name */
1406 ret
= parse_perf_probe_event_name(&arg
, pev
);
1414 * Check arg is function or file name and copy it.
1416 * We consider arg to be a file spec if and only if it satisfies
1417 * all of the below criteria::
1418 * - it does not include any of "+@%",
1419 * - it includes one of ":;", and
1420 * - it has a period '.' in the name.
1422 * Otherwise, we consider arg to be a function specification.
1424 if (!strpbrk(arg
, "+@%") && (ptr
= strpbrk(arg
, ";:")) != NULL
) {
1425 /* This is a file spec if it includes a '.' before ; or : */
1426 if (memchr(arg
, '.', ptr
- arg
))
1430 ptr
= strpbrk(arg
, ";:+@%");
1450 * Keep pp->function even if this is absolute address,
1451 * so it can mark whether abs_address is valid.
1452 * Which make 'perf probe lib.bin 0x0' possible.
1454 * Note that checking length of tmp is not needed
1455 * because when we access tmp[1] we know tmp[0] is '0',
1456 * so tmp[1] should always valid (but could be '\0').
1458 if (tmp
&& !strncmp(tmp
, "0x", 2)) {
1459 pp
->abs_address
= strtoul(pp
->function
, &tmp
, 0);
1461 semantic_error("Invalid absolute address.\n");
1467 /* Parse other options */
1471 if (c
== ';') { /* Lazy pattern must be the last part */
1472 pp
->lazy_line
= strdup(arg
);
1473 if (pp
->lazy_line
== NULL
)
1477 ptr
= strpbrk(arg
, ";:+@%");
1483 case ':': /* Line number */
1484 pp
->line
= strtoul(arg
, &tmp
, 0);
1486 semantic_error("There is non-digit char"
1487 " in line number.\n");
1491 case '+': /* Byte offset from a symbol */
1492 pp
->offset
= strtoul(arg
, &tmp
, 0);
1494 semantic_error("There is non-digit character"
1499 case '@': /* File name */
1501 semantic_error("SRC@SRC is not allowed.\n");
1504 pp
->file
= strdup(arg
);
1505 if (pp
->file
== NULL
)
1508 case '%': /* Probe places */
1509 if (strcmp(arg
, "return") == 0) {
1511 } else { /* Others not supported yet */
1512 semantic_error("%%%s is not supported.\n", arg
);
1516 default: /* Buggy case */
1517 pr_err("This program has a bug at %s:%d.\n",
1518 __FILE__
, __LINE__
);
1524 /* Exclusion check */
1525 if (pp
->lazy_line
&& pp
->line
) {
1526 semantic_error("Lazy pattern can't be used with"
1531 if (pp
->lazy_line
&& pp
->offset
) {
1532 semantic_error("Lazy pattern can't be used with offset.\n");
1536 if (pp
->line
&& pp
->offset
) {
1537 semantic_error("Offset can't be used with line number.\n");
1541 if (!pp
->line
&& !pp
->lazy_line
&& pp
->file
&& !pp
->function
) {
1542 semantic_error("File always requires line number or "
1547 if (pp
->offset
&& !pp
->function
) {
1548 semantic_error("Offset requires an entry function.\n");
1552 if ((pp
->offset
|| pp
->line
|| pp
->lazy_line
) && pp
->retprobe
) {
1553 semantic_error("Offset/Line/Lazy pattern can't be used with "
1558 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
1559 pp
->function
, pp
->file
, pp
->line
, pp
->offset
, pp
->retprobe
,
1564 /* Parse perf-probe event argument */
1565 static int parse_perf_probe_arg(char *str
, struct perf_probe_arg
*arg
)
1567 char *tmp
, *goodname
;
1568 struct perf_probe_arg_field
**fieldp
;
1570 pr_debug("parsing arg: %s into ", str
);
1572 tmp
= strchr(str
, '=');
1574 arg
->name
= strndup(str
, tmp
- str
);
1575 if (arg
->name
== NULL
)
1577 pr_debug("name:%s ", arg
->name
);
1581 tmp
= strchr(str
, ':');
1582 if (tmp
) { /* Type setting */
1584 arg
->type
= strdup(tmp
+ 1);
1585 if (arg
->type
== NULL
)
1587 pr_debug("type:%s ", arg
->type
);
1590 tmp
= strpbrk(str
, "-.[");
1591 if (!is_c_varname(str
) || !tmp
) {
1592 /* A variable, register, symbol or special value */
1593 arg
->var
= strdup(str
);
1594 if (arg
->var
== NULL
)
1596 pr_debug("%s\n", arg
->var
);
1600 /* Structure fields or array element */
1601 arg
->var
= strndup(str
, tmp
- str
);
1602 if (arg
->var
== NULL
)
1604 goodname
= arg
->var
;
1605 pr_debug("%s, ", arg
->var
);
1606 fieldp
= &arg
->field
;
1609 *fieldp
= zalloc(sizeof(struct perf_probe_arg_field
));
1610 if (*fieldp
== NULL
)
1612 if (*tmp
== '[') { /* Array */
1614 (*fieldp
)->index
= strtol(str
+ 1, &tmp
, 0);
1615 (*fieldp
)->ref
= true;
1616 if (*tmp
!= ']' || tmp
== str
+ 1) {
1617 semantic_error("Array index must be a"
1624 } else { /* Structure */
1627 (*fieldp
)->ref
= false;
1628 } else if (tmp
[1] == '>') {
1630 (*fieldp
)->ref
= true;
1632 semantic_error("Argument parse error: %s\n",
1636 tmp
= strpbrk(str
, "-.[");
1639 (*fieldp
)->name
= strndup(str
, tmp
- str
);
1640 if ((*fieldp
)->name
== NULL
)
1643 goodname
= (*fieldp
)->name
;
1644 pr_debug("%s(%d), ", (*fieldp
)->name
, (*fieldp
)->ref
);
1645 fieldp
= &(*fieldp
)->next
;
1648 (*fieldp
)->name
= strdup(str
);
1649 if ((*fieldp
)->name
== NULL
)
1652 goodname
= (*fieldp
)->name
;
1653 pr_debug("%s(%d)\n", (*fieldp
)->name
, (*fieldp
)->ref
);
1655 /* If no name is specified, set the last field name (not array index)*/
1657 arg
->name
= strdup(goodname
);
1658 if (arg
->name
== NULL
)
1664 /* Parse perf-probe event command */
1665 int parse_perf_probe_command(const char *cmd
, struct perf_probe_event
*pev
)
1668 int argc
, i
, ret
= 0;
1670 argv
= argv_split(cmd
, &argc
);
1672 pr_debug("Failed to split arguments.\n");
1675 if (argc
- 1 > MAX_PROBE_ARGS
) {
1676 semantic_error("Too many probe arguments (%d).\n", argc
- 1);
1680 /* Parse probe point */
1681 ret
= parse_perf_probe_point(argv
[0], pev
);
1685 /* Copy arguments and ensure return probe has no C argument */
1686 pev
->nargs
= argc
- 1;
1687 pev
->args
= zalloc(sizeof(struct perf_probe_arg
) * pev
->nargs
);
1688 if (pev
->args
== NULL
) {
1692 for (i
= 0; i
< pev
->nargs
&& ret
>= 0; i
++) {
1693 ret
= parse_perf_probe_arg(argv
[i
+ 1], &pev
->args
[i
]);
1695 is_c_varname(pev
->args
[i
].var
) && pev
->point
.retprobe
) {
1696 semantic_error("You can't specify local variable for"
1707 /* Returns true if *any* ARG is either C variable, $params or $vars. */
1708 bool perf_probe_with_var(struct perf_probe_event
*pev
)
1712 for (i
= 0; i
< pev
->nargs
; i
++)
1713 if (is_c_varname(pev
->args
[i
].var
) ||
1714 !strcmp(pev
->args
[i
].var
, PROBE_ARG_PARAMS
) ||
1715 !strcmp(pev
->args
[i
].var
, PROBE_ARG_VARS
))
1720 /* Return true if this perf_probe_event requires debuginfo */
1721 bool perf_probe_event_need_dwarf(struct perf_probe_event
*pev
)
1723 if (pev
->point
.file
|| pev
->point
.line
|| pev
->point
.lazy_line
)
1726 if (perf_probe_with_var(pev
))
1732 /* Parse probe_events event into struct probe_point */
1733 int parse_probe_trace_command(const char *cmd
, struct probe_trace_event
*tev
)
1735 struct probe_trace_point
*tp
= &tev
->point
;
1738 char *argv0_str
= NULL
, *fmt
, *fmt1_str
, *fmt2_str
, *fmt3_str
;
1742 pr_debug("Parsing probe_events: %s\n", cmd
);
1743 argv
= argv_split(cmd
, &argc
);
1745 pr_debug("Failed to split arguments.\n");
1749 semantic_error("Too few probe arguments.\n");
1754 /* Scan event and group name. */
1755 argv0_str
= strdup(argv
[0]);
1756 if (argv0_str
== NULL
) {
1760 fmt1_str
= strtok_r(argv0_str
, ":", &fmt
);
1761 fmt2_str
= strtok_r(NULL
, "/", &fmt
);
1762 fmt3_str
= strtok_r(NULL
, " \t", &fmt
);
1763 if (fmt1_str
== NULL
|| strlen(fmt1_str
) != 1 || fmt2_str
== NULL
1764 || fmt3_str
== NULL
) {
1765 semantic_error("Failed to parse event name: %s\n", argv
[0]);
1770 tev
->group
= strdup(fmt2_str
);
1771 tev
->event
= strdup(fmt3_str
);
1772 if (tev
->group
== NULL
|| tev
->event
== NULL
) {
1776 pr_debug("Group:%s Event:%s probe:%c\n", tev
->group
, tev
->event
, pr
);
1778 tp
->retprobe
= (pr
== 'r');
1780 /* Scan module name(if there), function name and offset */
1781 p
= strchr(argv
[1], ':');
1783 tp
->module
= strndup(argv
[1], p
- argv
[1]);
1788 tev
->uprobes
= (tp
->module
[0] == '/');
1792 fmt1_str
= strtok_r(p
, "+", &fmt
);
1793 /* only the address started with 0x */
1794 if (fmt1_str
[0] == '0') {
1796 * Fix a special case:
1797 * if address == 0, kernel reports something like:
1798 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax
1799 * Newer kernel may fix that, but we want to
1800 * support old kernel also.
1802 if (strcmp(fmt1_str
, "0x") == 0) {
1803 if (!argv
[2] || strcmp(argv
[2], "(null)")) {
1810 for (i
= 2; argv
[i
+ 1] != NULL
; i
++)
1811 argv
[i
] = argv
[i
+ 1];
1816 tp
->address
= strtoul(fmt1_str
, NULL
, 0);
1818 /* Only the symbol-based probe has offset */
1819 tp
->symbol
= strdup(fmt1_str
);
1820 if (tp
->symbol
== NULL
) {
1824 fmt2_str
= strtok_r(NULL
, "", &fmt
);
1825 if (fmt2_str
== NULL
)
1828 tp
->offset
= strtoul(fmt2_str
, NULL
, 10);
1831 tev
->nargs
= argc
- 2;
1832 tev
->args
= zalloc(sizeof(struct probe_trace_arg
) * tev
->nargs
);
1833 if (tev
->args
== NULL
) {
1837 for (i
= 0; i
< tev
->nargs
; i
++) {
1838 p
= strchr(argv
[i
+ 2], '=');
1839 if (p
) /* We don't need which register is assigned. */
1843 tev
->args
[i
].name
= strdup(argv
[i
+ 2]);
1844 /* TODO: parse regs and offset */
1845 tev
->args
[i
].value
= strdup(p
);
1846 if (tev
->args
[i
].name
== NULL
|| tev
->args
[i
].value
== NULL
) {
1858 /* Compose only probe arg */
1859 char *synthesize_perf_probe_arg(struct perf_probe_arg
*pa
)
1861 struct perf_probe_arg_field
*field
= pa
->field
;
1866 if (strbuf_init(&buf
, 64) < 0)
1869 if (pa
->name
&& pa
->var
)
1870 err
= strbuf_addf(&buf
, "%s=%s", pa
->name
, pa
->var
);
1872 err
= strbuf_addstr(&buf
, pa
->name
?: pa
->var
);
1877 if (field
->name
[0] == '[')
1878 err
= strbuf_addstr(&buf
, field
->name
);
1880 err
= strbuf_addf(&buf
, "%s%s", field
->ref
? "->" : ".",
1882 field
= field
->next
;
1888 if (strbuf_addf(&buf
, ":%s", pa
->type
) < 0)
1891 ret
= strbuf_detach(&buf
, NULL
);
1893 strbuf_release(&buf
);
1897 /* Compose only probe point (not argument) */
1898 char *synthesize_perf_probe_point(struct perf_probe_point
*pp
)
1901 char *tmp
, *ret
= NULL
;
1904 if (strbuf_init(&buf
, 64) < 0)
1908 if (strbuf_addstr(&buf
, pp
->function
) < 0)
1911 err
= strbuf_addf(&buf
, "+%lu", pp
->offset
);
1913 err
= strbuf_addf(&buf
, ":%d", pp
->line
);
1914 else if (pp
->retprobe
)
1915 err
= strbuf_addstr(&buf
, "%return");
1923 tmp
= strchr(pp
->file
+ len
- 30, '/');
1924 tmp
= tmp
? tmp
+ 1 : pp
->file
+ len
- 30;
1926 err
= strbuf_addf(&buf
, "@%s", tmp
);
1927 if (!err
&& !pp
->function
&& pp
->line
)
1928 err
= strbuf_addf(&buf
, ":%d", pp
->line
);
1931 ret
= strbuf_detach(&buf
, NULL
);
1933 strbuf_release(&buf
);
1937 char *synthesize_perf_probe_command(struct perf_probe_event
*pev
)
1940 char *tmp
, *ret
= NULL
;
1943 if (strbuf_init(&buf
, 64))
1946 if (strbuf_addf(&buf
, "%s:%s=", pev
->group
?: PERFPROBE_GROUP
,
1950 tmp
= synthesize_perf_probe_point(&pev
->point
);
1951 if (!tmp
|| strbuf_addstr(&buf
, tmp
) < 0)
1955 for (i
= 0; i
< pev
->nargs
; i
++) {
1956 tmp
= synthesize_perf_probe_arg(pev
->args
+ i
);
1957 if (!tmp
|| strbuf_addf(&buf
, " %s", tmp
) < 0)
1962 ret
= strbuf_detach(&buf
, NULL
);
1964 strbuf_release(&buf
);
1968 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref
*ref
,
1969 struct strbuf
*buf
, int depth
)
1973 depth
= __synthesize_probe_trace_arg_ref(ref
->next
, buf
,
1978 err
= strbuf_addf(buf
, "%+ld(", ref
->offset
);
1979 return (err
< 0) ? err
: depth
;
1982 static int synthesize_probe_trace_arg(struct probe_trace_arg
*arg
,
1985 struct probe_trace_arg_ref
*ref
= arg
->ref
;
1988 /* Argument name or separator */
1990 err
= strbuf_addf(buf
, " %s=", arg
->name
);
1992 err
= strbuf_addch(buf
, ' ');
1996 /* Special case: @XXX */
1997 if (arg
->value
[0] == '@' && arg
->ref
)
2000 /* Dereferencing arguments */
2002 depth
= __synthesize_probe_trace_arg_ref(ref
, buf
, 1);
2007 /* Print argument value */
2008 if (arg
->value
[0] == '@' && arg
->ref
)
2009 err
= strbuf_addf(buf
, "%s%+ld", arg
->value
, arg
->ref
->offset
);
2011 err
= strbuf_addstr(buf
, arg
->value
);
2014 while (!err
&& depth
--)
2015 err
= strbuf_addch(buf
, ')');
2017 /* Print argument type */
2018 if (!err
&& arg
->type
)
2019 err
= strbuf_addf(buf
, ":%s", arg
->type
);
2024 char *synthesize_probe_trace_command(struct probe_trace_event
*tev
)
2026 struct probe_trace_point
*tp
= &tev
->point
;
2031 /* Uprobes must have tp->module */
2032 if (tev
->uprobes
&& !tp
->module
)
2035 if (strbuf_init(&buf
, 32) < 0)
2038 if (strbuf_addf(&buf
, "%c:%s/%s ", tp
->retprobe
? 'r' : 'p',
2039 tev
->group
, tev
->event
) < 0)
2042 * If tp->address == 0, then this point must be a
2043 * absolute address uprobe.
2044 * try_to_find_absolute_address() should have made
2045 * tp->symbol to "0x0".
2047 if (tev
->uprobes
&& !tp
->address
) {
2048 if (!tp
->symbol
|| strcmp(tp
->symbol
, "0x0"))
2052 /* Use the tp->address for uprobes */
2054 err
= strbuf_addf(&buf
, "%s:0x%lx", tp
->module
, tp
->address
);
2055 else if (!strncmp(tp
->symbol
, "0x", 2))
2056 /* Absolute address. See try_to_find_absolute_address() */
2057 err
= strbuf_addf(&buf
, "%s%s0x%lx", tp
->module
?: "",
2058 tp
->module
? ":" : "", tp
->address
);
2060 err
= strbuf_addf(&buf
, "%s%s%s+%lu", tp
->module
?: "",
2061 tp
->module
? ":" : "", tp
->symbol
, tp
->offset
);
2065 for (i
= 0; i
< tev
->nargs
; i
++)
2066 if (synthesize_probe_trace_arg(&tev
->args
[i
], &buf
) < 0)
2069 ret
= strbuf_detach(&buf
, NULL
);
2071 strbuf_release(&buf
);
2075 static int find_perf_probe_point_from_map(struct probe_trace_point
*tp
,
2076 struct perf_probe_point
*pp
,
2079 struct symbol
*sym
= NULL
;
2080 struct map
*map
= NULL
;
2081 u64 addr
= tp
->address
;
2085 map
= dso__new_map(tp
->module
);
2088 sym
= map__find_symbol(map
, addr
);
2090 if (tp
->symbol
&& !addr
) {
2091 if (kernel_get_symbol_address_by_name(tp
->symbol
,
2092 &addr
, true, false) < 0)
2097 sym
= __find_kernel_function(addr
, &map
);
2104 pp
->retprobe
= tp
->retprobe
;
2105 pp
->offset
= addr
- map
->unmap_ip(map
, sym
->start
);
2106 pp
->function
= strdup(sym
->name
);
2107 ret
= pp
->function
? 0 : -ENOMEM
;
2110 if (map
&& !is_kprobe
) {
2117 static int convert_to_perf_probe_point(struct probe_trace_point
*tp
,
2118 struct perf_probe_point
*pp
,
2124 ret
= find_perf_probe_point_from_dwarf(tp
, pp
, is_kprobe
);
2127 ret
= find_perf_probe_point_from_map(tp
, pp
, is_kprobe
);
2131 pr_debug("Failed to find probe point from both of dwarf and map.\n");
2134 pp
->function
= strdup(tp
->symbol
);
2135 pp
->offset
= tp
->offset
;
2137 ret
= e_snprintf(buf
, 128, "0x%" PRIx64
, (u64
)tp
->address
);
2140 pp
->function
= strdup(buf
);
2143 if (pp
->function
== NULL
)
2146 pp
->retprobe
= tp
->retprobe
;
2151 static int convert_to_perf_probe_event(struct probe_trace_event
*tev
,
2152 struct perf_probe_event
*pev
, bool is_kprobe
)
2154 struct strbuf buf
= STRBUF_INIT
;
2157 /* Convert event/group name */
2158 pev
->event
= strdup(tev
->event
);
2159 pev
->group
= strdup(tev
->group
);
2160 if (pev
->event
== NULL
|| pev
->group
== NULL
)
2163 /* Convert trace_point to probe_point */
2164 ret
= convert_to_perf_probe_point(&tev
->point
, &pev
->point
, is_kprobe
);
2168 /* Convert trace_arg to probe_arg */
2169 pev
->nargs
= tev
->nargs
;
2170 pev
->args
= zalloc(sizeof(struct perf_probe_arg
) * pev
->nargs
);
2171 if (pev
->args
== NULL
)
2173 for (i
= 0; i
< tev
->nargs
&& ret
>= 0; i
++) {
2174 if (tev
->args
[i
].name
)
2175 pev
->args
[i
].name
= strdup(tev
->args
[i
].name
);
2177 if ((ret
= strbuf_init(&buf
, 32)) < 0)
2179 ret
= synthesize_probe_trace_arg(&tev
->args
[i
], &buf
);
2180 pev
->args
[i
].name
= strbuf_detach(&buf
, NULL
);
2182 if (pev
->args
[i
].name
== NULL
&& ret
>= 0)
2187 clear_perf_probe_event(pev
);
2192 void clear_perf_probe_event(struct perf_probe_event
*pev
)
2194 struct perf_probe_arg_field
*field
, *next
;
2200 clear_perf_probe_point(&pev
->point
);
2202 for (i
= 0; i
< pev
->nargs
; i
++) {
2203 free(pev
->args
[i
].name
);
2204 free(pev
->args
[i
].var
);
2205 free(pev
->args
[i
].type
);
2206 field
= pev
->args
[i
].field
;
2209 zfree(&field
->name
);
2215 memset(pev
, 0, sizeof(*pev
));
2218 #define strdup_or_goto(str, label) \
2219 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
2221 static int perf_probe_point__copy(struct perf_probe_point
*dst
,
2222 struct perf_probe_point
*src
)
2224 dst
->file
= strdup_or_goto(src
->file
, out_err
);
2225 dst
->function
= strdup_or_goto(src
->function
, out_err
);
2226 dst
->lazy_line
= strdup_or_goto(src
->lazy_line
, out_err
);
2227 dst
->line
= src
->line
;
2228 dst
->retprobe
= src
->retprobe
;
2229 dst
->offset
= src
->offset
;
2233 clear_perf_probe_point(dst
);
2237 static int perf_probe_arg__copy(struct perf_probe_arg
*dst
,
2238 struct perf_probe_arg
*src
)
2240 struct perf_probe_arg_field
*field
, **ppfield
;
2242 dst
->name
= strdup_or_goto(src
->name
, out_err
);
2243 dst
->var
= strdup_or_goto(src
->var
, out_err
);
2244 dst
->type
= strdup_or_goto(src
->type
, out_err
);
2247 ppfield
= &(dst
->field
);
2249 *ppfield
= zalloc(sizeof(*field
));
2252 (*ppfield
)->name
= strdup_or_goto(field
->name
, out_err
);
2253 (*ppfield
)->index
= field
->index
;
2254 (*ppfield
)->ref
= field
->ref
;
2255 field
= field
->next
;
2256 ppfield
= &((*ppfield
)->next
);
2263 int perf_probe_event__copy(struct perf_probe_event
*dst
,
2264 struct perf_probe_event
*src
)
2268 dst
->event
= strdup_or_goto(src
->event
, out_err
);
2269 dst
->group
= strdup_or_goto(src
->group
, out_err
);
2270 dst
->target
= strdup_or_goto(src
->target
, out_err
);
2271 dst
->uprobes
= src
->uprobes
;
2273 if (perf_probe_point__copy(&dst
->point
, &src
->point
) < 0)
2276 dst
->args
= zalloc(sizeof(struct perf_probe_arg
) * src
->nargs
);
2279 dst
->nargs
= src
->nargs
;
2281 for (i
= 0; i
< src
->nargs
; i
++)
2282 if (perf_probe_arg__copy(&dst
->args
[i
], &src
->args
[i
]) < 0)
2287 clear_perf_probe_event(dst
);
2291 void clear_probe_trace_event(struct probe_trace_event
*tev
)
2293 struct probe_trace_arg_ref
*ref
, *next
;
2298 free(tev
->point
.symbol
);
2299 free(tev
->point
.realname
);
2300 free(tev
->point
.module
);
2301 for (i
= 0; i
< tev
->nargs
; i
++) {
2302 free(tev
->args
[i
].name
);
2303 free(tev
->args
[i
].value
);
2304 free(tev
->args
[i
].type
);
2305 ref
= tev
->args
[i
].ref
;
2313 memset(tev
, 0, sizeof(*tev
));
2316 struct kprobe_blacklist_node
{
2317 struct list_head list
;
2318 unsigned long start
;
2323 static void kprobe_blacklist__delete(struct list_head
*blacklist
)
2325 struct kprobe_blacklist_node
*node
;
2327 while (!list_empty(blacklist
)) {
2328 node
= list_first_entry(blacklist
,
2329 struct kprobe_blacklist_node
, list
);
2330 list_del(&node
->list
);
2336 static int kprobe_blacklist__load(struct list_head
*blacklist
)
2338 struct kprobe_blacklist_node
*node
;
2339 const char *__debugfs
= debugfs__mountpoint();
2340 char buf
[PATH_MAX
], *p
;
2344 if (__debugfs
== NULL
)
2347 ret
= e_snprintf(buf
, PATH_MAX
, "%s/kprobes/blacklist", __debugfs
);
2351 fp
= fopen(buf
, "r");
2356 while (fgets(buf
, PATH_MAX
, fp
)) {
2357 node
= zalloc(sizeof(*node
));
2362 INIT_LIST_HEAD(&node
->list
);
2363 list_add_tail(&node
->list
, blacklist
);
2364 if (sscanf(buf
, "0x%lx-0x%lx", &node
->start
, &node
->end
) != 2) {
2368 p
= strchr(buf
, '\t');
2371 if (p
[strlen(p
) - 1] == '\n')
2372 p
[strlen(p
) - 1] = '\0';
2374 p
= (char *)"unknown";
2375 node
->symbol
= strdup(p
);
2376 if (!node
->symbol
) {
2380 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
2381 node
->start
, node
->end
, node
->symbol
);
2385 kprobe_blacklist__delete(blacklist
);
2391 static struct kprobe_blacklist_node
*
2392 kprobe_blacklist__find_by_address(struct list_head
*blacklist
,
2393 unsigned long address
)
2395 struct kprobe_blacklist_node
*node
;
2397 list_for_each_entry(node
, blacklist
, list
) {
2398 if (node
->start
<= address
&& address
< node
->end
)
2405 static LIST_HEAD(kprobe_blacklist
);
2407 static void kprobe_blacklist__init(void)
2409 if (!list_empty(&kprobe_blacklist
))
2412 if (kprobe_blacklist__load(&kprobe_blacklist
) < 0)
2413 pr_debug("No kprobe blacklist support, ignored\n");
2416 static void kprobe_blacklist__release(void)
2418 kprobe_blacklist__delete(&kprobe_blacklist
);
2421 static bool kprobe_blacklist__listed(unsigned long address
)
2423 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist
, address
);
2426 static int perf_probe_event__sprintf(const char *group
, const char *event
,
2427 struct perf_probe_event
*pev
,
2429 struct strbuf
*result
)
2434 if (asprintf(&buf
, "%s:%s", group
, event
) < 0)
2436 ret
= strbuf_addf(result
, " %-20s (on ", buf
);
2441 /* Synthesize only event probe point */
2442 buf
= synthesize_perf_probe_point(&pev
->point
);
2445 ret
= strbuf_addstr(result
, buf
);
2449 ret
= strbuf_addf(result
, " in %s", module
);
2451 if (!ret
&& pev
->nargs
> 0) {
2452 ret
= strbuf_add(result
, " with", 5);
2453 for (i
= 0; !ret
&& i
< pev
->nargs
; i
++) {
2454 buf
= synthesize_perf_probe_arg(&pev
->args
[i
]);
2457 ret
= strbuf_addf(result
, " %s", buf
);
2462 ret
= strbuf_addch(result
, ')');
2468 int show_perf_probe_event(const char *group
, const char *event
,
2469 struct perf_probe_event
*pev
,
2470 const char *module
, bool use_stdout
)
2472 struct strbuf buf
= STRBUF_INIT
;
2475 ret
= perf_probe_event__sprintf(group
, event
, pev
, module
, &buf
);
2478 printf("%s\n", buf
.buf
);
2480 pr_info("%s\n", buf
.buf
);
2482 strbuf_release(&buf
);
2487 static bool filter_probe_trace_event(struct probe_trace_event
*tev
,
2488 struct strfilter
*filter
)
2492 /* At first, check the event name itself */
2493 if (strfilter__compare(filter
, tev
->event
))
2496 /* Next, check the combination of name and group */
2497 if (e_snprintf(tmp
, 128, "%s:%s", tev
->group
, tev
->event
) < 0)
2499 return strfilter__compare(filter
, tmp
);
2502 static int __show_perf_probe_events(int fd
, bool is_kprobe
,
2503 struct strfilter
*filter
)
2506 struct probe_trace_event tev
;
2507 struct perf_probe_event pev
;
2508 struct strlist
*rawlist
;
2509 struct str_node
*ent
;
2511 memset(&tev
, 0, sizeof(tev
));
2512 memset(&pev
, 0, sizeof(pev
));
2514 rawlist
= probe_file__get_rawlist(fd
);
2518 strlist__for_each_entry(ent
, rawlist
) {
2519 ret
= parse_probe_trace_command(ent
->s
, &tev
);
2521 if (!filter_probe_trace_event(&tev
, filter
))
2523 ret
= convert_to_perf_probe_event(&tev
, &pev
,
2527 ret
= show_perf_probe_event(pev
.group
, pev
.event
,
2528 &pev
, tev
.point
.module
,
2532 clear_perf_probe_event(&pev
);
2533 clear_probe_trace_event(&tev
);
2537 strlist__delete(rawlist
);
2538 /* Cleanup cached debuginfo if needed */
2539 debuginfo_cache__exit();
2544 /* List up current perf-probe events */
2545 int show_perf_probe_events(struct strfilter
*filter
)
2547 int kp_fd
, up_fd
, ret
;
2551 if (probe_conf
.cache
)
2552 return probe_cache__show_all_caches(filter
);
2554 ret
= init_probe_symbol_maps(false);
2558 ret
= probe_file__open_both(&kp_fd
, &up_fd
, 0);
2563 ret
= __show_perf_probe_events(kp_fd
, true, filter
);
2564 if (up_fd
>= 0 && ret
>= 0)
2565 ret
= __show_perf_probe_events(up_fd
, false, filter
);
2570 exit_probe_symbol_maps();
2575 static int get_new_event_name(char *buf
, size_t len
, const char *base
,
2576 struct strlist
*namelist
, bool allow_suffix
)
2583 nbase
= strdup(base
);
2587 /* Cut off the dot suffixes (e.g. .const, .isra)*/
2588 p
= strchr(nbase
, '.');
2589 if (p
&& p
!= nbase
)
2592 /* Try no suffix number */
2593 ret
= e_snprintf(buf
, len
, "%s", nbase
);
2595 pr_debug("snprintf() failed: %d\n", ret
);
2598 if (!strlist__has_entry(namelist
, buf
))
2601 if (!allow_suffix
) {
2602 pr_warning("Error: event \"%s\" already exists.\n"
2603 " Hint: Remove existing event by 'perf probe -d'\n"
2604 " or force duplicates by 'perf probe -f'\n"
2605 " or set 'force=yes' in BPF source.\n",
2611 /* Try to add suffix */
2612 for (i
= 1; i
< MAX_EVENT_INDEX
; i
++) {
2613 ret
= e_snprintf(buf
, len
, "%s_%d", nbase
, i
);
2615 pr_debug("snprintf() failed: %d\n", ret
);
2618 if (!strlist__has_entry(namelist
, buf
))
2621 if (i
== MAX_EVENT_INDEX
) {
2622 pr_warning("Too many events are on the same function.\n");
2631 /* Warn if the current kernel's uprobe implementation is old */
2632 static void warn_uprobe_event_compat(struct probe_trace_event
*tev
)
2635 char *buf
= synthesize_probe_trace_command(tev
);
2637 /* Old uprobe event doesn't support memory dereference */
2638 if (!tev
->uprobes
|| tev
->nargs
== 0 || !buf
)
2641 for (i
= 0; i
< tev
->nargs
; i
++)
2642 if (strglobmatch(tev
->args
[i
].value
, "[$@+-]*")) {
2643 pr_warning("Please upgrade your kernel to at least "
2644 "3.14 to have access to feature %s\n",
2645 tev
->args
[i
].value
);
2652 /* Set new name from original perf_probe_event and namelist */
2653 static int probe_trace_event__set_name(struct probe_trace_event
*tev
,
2654 struct perf_probe_event
*pev
,
2655 struct strlist
*namelist
,
2658 const char *event
, *group
;
2662 /* If probe_event or trace_event already have the name, reuse it */
2663 if (pev
->event
&& !pev
->sdt
)
2665 else if (tev
->event
)
2668 /* Or generate new one from probe point */
2669 if (pev
->point
.function
&&
2670 (strncmp(pev
->point
.function
, "0x", 2) != 0) &&
2671 !strisglob(pev
->point
.function
))
2672 event
= pev
->point
.function
;
2674 event
= tev
->point
.realname
;
2676 if (pev
->group
&& !pev
->sdt
)
2678 else if (tev
->group
)
2681 group
= PERFPROBE_GROUP
;
2683 /* Get an unused new event name */
2684 ret
= get_new_event_name(buf
, 64, event
,
2685 namelist
, allow_suffix
);
2691 tev
->event
= strdup(event
);
2692 tev
->group
= strdup(group
);
2693 if (tev
->event
== NULL
|| tev
->group
== NULL
)
2696 /* Add added event name to namelist */
2697 strlist__add(namelist
, event
);
2701 static int __open_probe_file_and_namelist(bool uprobe
,
2702 struct strlist
**namelist
)
2706 fd
= probe_file__open(PF_FL_RW
| (uprobe
? PF_FL_UPROBE
: 0));
2710 /* Get current event names */
2711 *namelist
= probe_file__get_namelist(fd
);
2713 pr_debug("Failed to get current event list.\n");
2720 static int __add_probe_trace_events(struct perf_probe_event
*pev
,
2721 struct probe_trace_event
*tevs
,
2722 int ntevs
, bool allow_suffix
)
2724 int i
, fd
[2] = {-1, -1}, up
, ret
;
2725 struct probe_trace_event
*tev
= NULL
;
2726 struct probe_cache
*cache
= NULL
;
2727 struct strlist
*namelist
[2] = {NULL
, NULL
};
2728 struct nscookie nsc
;
2730 up
= pev
->uprobes
? 1 : 0;
2731 fd
[up
] = __open_probe_file_and_namelist(up
, &namelist
[up
]);
2736 for (i
= 0; i
< ntevs
; i
++) {
2738 up
= tev
->uprobes
? 1 : 0;
2739 if (fd
[up
] == -1) { /* Open the kprobe/uprobe_events */
2740 fd
[up
] = __open_probe_file_and_namelist(up
,
2745 /* Skip if the symbol is out of .text or blacklisted */
2746 if (!tev
->point
.symbol
&& !pev
->uprobes
)
2749 /* Set new name for tev (and update namelist) */
2750 ret
= probe_trace_event__set_name(tev
, pev
, namelist
[up
],
2755 nsinfo__mountns_enter(pev
->nsi
, &nsc
);
2756 ret
= probe_file__add_event(fd
[up
], tev
);
2757 nsinfo__mountns_exit(&nsc
);
2762 * Probes after the first probe which comes from same
2763 * user input are always allowed to add suffix, because
2764 * there might be several addresses corresponding to
2767 allow_suffix
= true;
2769 if (ret
== -EINVAL
&& pev
->uprobes
)
2770 warn_uprobe_event_compat(tev
);
2771 if (ret
== 0 && probe_conf
.cache
) {
2772 cache
= probe_cache__new(pev
->target
, pev
->nsi
);
2774 probe_cache__add_entry(cache
, pev
, tevs
, ntevs
) < 0 ||
2775 probe_cache__commit(cache
) < 0)
2776 pr_warning("Failed to add event to probe cache\n");
2777 probe_cache__delete(cache
);
2781 for (up
= 0; up
< 2; up
++) {
2782 strlist__delete(namelist
[up
]);
2789 static int find_probe_functions(struct map
*map
, char *name
,
2790 struct symbol
**syms
)
2794 struct rb_node
*tmp
;
2796 if (map__load(map
) < 0)
2799 map__for_each_symbol(map
, sym
, tmp
) {
2800 if (strglobmatch(sym
->name
, name
)) {
2802 if (syms
&& found
< probe_conf
.max_probes
)
2803 syms
[found
- 1] = sym
;
2810 void __weak
arch__fix_tev_from_maps(struct perf_probe_event
*pev __maybe_unused
,
2811 struct probe_trace_event
*tev __maybe_unused
,
2812 struct map
*map __maybe_unused
,
2813 struct symbol
*sym __maybe_unused
) { }
2816 * Find probe function addresses from map.
2817 * Return an error or the number of found probe_trace_event
2819 static int find_probe_trace_events_from_map(struct perf_probe_event
*pev
,
2820 struct probe_trace_event
**tevs
)
2822 struct map
*map
= NULL
;
2823 struct ref_reloc_sym
*reloc_sym
= NULL
;
2825 struct symbol
**syms
= NULL
;
2826 struct probe_trace_event
*tev
;
2827 struct perf_probe_point
*pp
= &pev
->point
;
2828 struct probe_trace_point
*tp
;
2829 int num_matched_functions
;
2830 int ret
, i
, j
, skipped
= 0;
2833 map
= get_target_map(pev
->target
, pev
->nsi
, pev
->uprobes
);
2839 syms
= malloc(sizeof(struct symbol
*) * probe_conf
.max_probes
);
2846 * Load matched symbols: Since the different local symbols may have
2847 * same name but different addresses, this lists all the symbols.
2849 num_matched_functions
= find_probe_functions(map
, pp
->function
, syms
);
2850 if (num_matched_functions
== 0) {
2851 pr_err("Failed to find symbol %s in %s\n", pp
->function
,
2852 pev
->target
? : "kernel");
2855 } else if (num_matched_functions
> probe_conf
.max_probes
) {
2856 pr_err("Too many functions matched in %s\n",
2857 pev
->target
? : "kernel");
2862 /* Note that the symbols in the kmodule are not relocated */
2863 if (!pev
->uprobes
&& !pev
->target
&&
2864 (!pp
->retprobe
|| kretprobe_offset_is_supported())) {
2865 reloc_sym
= kernel_get_ref_reloc_sym();
2867 pr_warning("Relocated base symbol is not found!\n");
2873 /* Setup result trace-probe-events */
2874 *tevs
= zalloc(sizeof(*tev
) * num_matched_functions
);
2882 for (j
= 0; j
< num_matched_functions
; j
++) {
2885 tev
= (*tevs
) + ret
;
2887 if (ret
== num_matched_functions
) {
2888 pr_warning("Too many symbols are listed. Skip it.\n");
2893 if (pp
->offset
> sym
->end
- sym
->start
) {
2894 pr_warning("Offset %ld is bigger than the size of %s\n",
2895 pp
->offset
, sym
->name
);
2899 /* Add one probe point */
2900 tp
->address
= map
->unmap_ip(map
, sym
->start
) + pp
->offset
;
2902 /* Check the kprobe (not in module) is within .text */
2903 if (!pev
->uprobes
&& !pev
->target
&&
2904 kprobe_warn_out_range(sym
->name
, tp
->address
)) {
2905 tp
->symbol
= NULL
; /* Skip it */
2907 } else if (reloc_sym
) {
2908 tp
->symbol
= strdup_or_goto(reloc_sym
->name
, nomem_out
);
2909 tp
->offset
= tp
->address
- reloc_sym
->addr
;
2911 tp
->symbol
= strdup_or_goto(sym
->name
, nomem_out
);
2912 tp
->offset
= pp
->offset
;
2914 tp
->realname
= strdup_or_goto(sym
->name
, nomem_out
);
2916 tp
->retprobe
= pp
->retprobe
;
2919 tev
->point
.module
= strdup_or_goto(pev
->target
,
2922 mod_name
= find_module_name(pev
->target
);
2924 strdup(mod_name
? mod_name
: pev
->target
);
2926 if (!tev
->point
.module
)
2930 tev
->uprobes
= pev
->uprobes
;
2931 tev
->nargs
= pev
->nargs
;
2933 tev
->args
= zalloc(sizeof(struct probe_trace_arg
) *
2935 if (tev
->args
== NULL
)
2938 for (i
= 0; i
< tev
->nargs
; i
++) {
2939 if (pev
->args
[i
].name
)
2941 strdup_or_goto(pev
->args
[i
].name
,
2944 tev
->args
[i
].value
= strdup_or_goto(pev
->args
[i
].var
,
2946 if (pev
->args
[i
].type
)
2948 strdup_or_goto(pev
->args
[i
].type
,
2951 arch__fix_tev_from_maps(pev
, tev
, map
, sym
);
2953 if (ret
== skipped
) {
2966 clear_probe_trace_events(*tevs
, num_matched_functions
);
2971 static int try_to_find_absolute_address(struct perf_probe_event
*pev
,
2972 struct probe_trace_event
**tevs
)
2974 struct perf_probe_point
*pp
= &pev
->point
;
2975 struct probe_trace_event
*tev
;
2976 struct probe_trace_point
*tp
;
2979 if (!(pev
->point
.function
&& !strncmp(pev
->point
.function
, "0x", 2)))
2981 if (perf_probe_event_need_dwarf(pev
))
2985 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at
2988 * Only one tev can be generated by this.
2990 *tevs
= zalloc(sizeof(*tev
));
2998 * Don't use tp->offset, use address directly, because
2999 * in synthesize_probe_trace_command() address cannot be
3002 tp
->address
= pev
->point
.abs_address
;
3003 tp
->retprobe
= pp
->retprobe
;
3004 tev
->uprobes
= pev
->uprobes
;
3008 * Give it a '0x' leading symbol name.
3009 * In __add_probe_trace_events, a NULL symbol is interpreted as
3012 if (asprintf(&tp
->symbol
, "0x%lx", tp
->address
) < 0)
3015 /* For kprobe, check range */
3016 if ((!tev
->uprobes
) &&
3017 (kprobe_warn_out_range(tev
->point
.symbol
,
3018 tev
->point
.address
))) {
3023 if (asprintf(&tp
->realname
, "abs_%lx", tp
->address
) < 0)
3027 tp
->module
= strdup(pev
->target
);
3033 tev
->group
= strdup(pev
->group
);
3039 tev
->event
= strdup(pev
->event
);
3044 tev
->nargs
= pev
->nargs
;
3045 tev
->args
= zalloc(sizeof(struct probe_trace_arg
) * tev
->nargs
);
3049 for (i
= 0; i
< tev
->nargs
; i
++)
3050 copy_to_probe_trace_arg(&tev
->args
[i
], &pev
->args
[i
]);
3055 clear_probe_trace_events(*tevs
, 1);
3060 /* Concatinate two arrays */
3061 static void *memcat(void *a
, size_t sz_a
, void *b
, size_t sz_b
)
3065 ret
= malloc(sz_a
+ sz_b
);
3067 memcpy(ret
, a
, sz_a
);
3068 memcpy(ret
+ sz_a
, b
, sz_b
);
3074 concat_probe_trace_events(struct probe_trace_event
**tevs
, int *ntevs
,
3075 struct probe_trace_event
**tevs2
, int ntevs2
)
3077 struct probe_trace_event
*new_tevs
;
3087 if (*ntevs
+ ntevs2
> probe_conf
.max_probes
)
3090 /* Concatinate the array of probe_trace_event */
3091 new_tevs
= memcat(*tevs
, (*ntevs
) * sizeof(**tevs
),
3092 *tevs2
, ntevs2
* sizeof(**tevs2
));
3102 clear_probe_trace_events(*tevs2
, ntevs2
);
3109 * Try to find probe_trace_event from given probe caches. Return the number
3110 * of cached events found, if an error occurs return the error.
3112 static int find_cached_events(struct perf_probe_event
*pev
,
3113 struct probe_trace_event
**tevs
,
3116 struct probe_cache
*cache
;
3117 struct probe_cache_entry
*entry
;
3118 struct probe_trace_event
*tmp_tevs
= NULL
;
3122 cache
= probe_cache__new(target
, pev
->nsi
);
3123 /* Return 0 ("not found") if the target has no probe cache. */
3127 for_each_probe_cache_entry(entry
, cache
) {
3128 /* Skip the cache entry which has no name */
3129 if (!entry
->pev
.event
|| !entry
->pev
.group
)
3131 if ((!pev
->group
|| strglobmatch(entry
->pev
.group
, pev
->group
)) &&
3132 strglobmatch(entry
->pev
.event
, pev
->event
)) {
3133 ret
= probe_cache_entry__get_event(entry
, &tmp_tevs
);
3135 ret
= concat_probe_trace_events(tevs
, &ntevs
,
3141 probe_cache__delete(cache
);
3143 clear_probe_trace_events(*tevs
, ntevs
);
3147 if (ntevs
> 0 && target
&& target
[0] == '/')
3148 pev
->uprobes
= true;
3154 /* Try to find probe_trace_event from all probe caches */
3155 static int find_cached_events_all(struct perf_probe_event
*pev
,
3156 struct probe_trace_event
**tevs
)
3158 struct probe_trace_event
*tmp_tevs
= NULL
;
3159 struct strlist
*bidlist
;
3160 struct str_node
*nd
;
3165 /* Get the buildid list of all valid caches */
3166 bidlist
= build_id_cache__list_all(true);
3169 pr_debug("Failed to get buildids: %d\n", ret
);
3174 strlist__for_each_entry(nd
, bidlist
) {
3175 pathname
= build_id_cache__origname(nd
->s
);
3176 ret
= find_cached_events(pev
, &tmp_tevs
, pathname
);
3177 /* In the case of cnt == 0, we just skip it */
3179 ret
= concat_probe_trace_events(tevs
, &ntevs
,
3185 strlist__delete(bidlist
);
3188 clear_probe_trace_events(*tevs
, ntevs
);
3196 static int find_probe_trace_events_from_cache(struct perf_probe_event
*pev
,
3197 struct probe_trace_event
**tevs
)
3199 struct probe_cache
*cache
;
3200 struct probe_cache_entry
*entry
;
3201 struct probe_trace_event
*tev
;
3202 struct str_node
*node
;
3206 /* For SDT/cached events, we use special search functions */
3208 return find_cached_events_all(pev
, tevs
);
3210 return find_cached_events(pev
, tevs
, pev
->target
);
3212 cache
= probe_cache__new(pev
->target
, pev
->nsi
);
3216 entry
= probe_cache__find(cache
, pev
);
3218 /* SDT must be in the cache */
3219 ret
= pev
->sdt
? -ENOENT
: 0;
3223 ret
= strlist__nr_entries(entry
->tevlist
);
3224 if (ret
> probe_conf
.max_probes
) {
3225 pr_debug("Too many entries matched in the cache of %s\n",
3226 pev
->target
? : "kernel");
3231 *tevs
= zalloc(ret
* sizeof(*tev
));
3238 strlist__for_each_entry(node
, entry
->tevlist
) {
3239 tev
= &(*tevs
)[i
++];
3240 ret
= parse_probe_trace_command(node
->s
, tev
);
3243 /* Set the uprobes attribute as same as original */
3244 tev
->uprobes
= pev
->uprobes
;
3249 probe_cache__delete(cache
);
3253 static int convert_to_probe_trace_events(struct perf_probe_event
*pev
,
3254 struct probe_trace_event
**tevs
)
3258 if (!pev
->group
&& !pev
->sdt
) {
3259 /* Set group name if not given */
3260 if (!pev
->uprobes
) {
3261 pev
->group
= strdup(PERFPROBE_GROUP
);
3262 ret
= pev
->group
? 0 : -ENOMEM
;
3264 ret
= convert_exec_to_group(pev
->target
, &pev
->group
);
3266 pr_warning("Failed to make a group name.\n");
3271 ret
= try_to_find_absolute_address(pev
, tevs
);
3275 /* At first, we need to lookup cache entry */
3276 ret
= find_probe_trace_events_from_cache(pev
, tevs
);
3277 if (ret
> 0 || pev
->sdt
) /* SDT can be found only in the cache */
3278 return ret
== 0 ? -ENOENT
: ret
; /* Found in probe cache */
3280 /* Convert perf_probe_event with debuginfo */
3281 ret
= try_to_find_probe_trace_events(pev
, tevs
);
3283 return ret
; /* Found in debuginfo or got an error */
3285 return find_probe_trace_events_from_map(pev
, tevs
);
3288 int convert_perf_probe_events(struct perf_probe_event
*pevs
, int npevs
)
3292 /* Loop 1: convert all events */
3293 for (i
= 0; i
< npevs
; i
++) {
3294 /* Init kprobe blacklist if needed */
3295 if (!pevs
[i
].uprobes
)
3296 kprobe_blacklist__init();
3297 /* Convert with or without debuginfo */
3298 ret
= convert_to_probe_trace_events(&pevs
[i
], &pevs
[i
].tevs
);
3301 pevs
[i
].ntevs
= ret
;
3303 /* This just release blacklist only if allocated */
3304 kprobe_blacklist__release();
3309 static int show_probe_trace_event(struct probe_trace_event
*tev
)
3311 char *buf
= synthesize_probe_trace_command(tev
);
3314 pr_debug("Failed to synthesize probe trace event.\n");
3318 /* Showing definition always go stdout */
3319 printf("%s\n", buf
);
3325 int show_probe_trace_events(struct perf_probe_event
*pevs
, int npevs
)
3327 struct strlist
*namelist
= strlist__new(NULL
, NULL
);
3328 struct probe_trace_event
*tev
;
3329 struct perf_probe_event
*pev
;
3335 for (j
= 0; j
< npevs
&& !ret
; j
++) {
3337 for (i
= 0; i
< pev
->ntevs
&& !ret
; i
++) {
3338 tev
= &pev
->tevs
[i
];
3339 /* Skip if the symbol is out of .text or blacklisted */
3340 if (!tev
->point
.symbol
&& !pev
->uprobes
)
3343 /* Set new name for tev (and update namelist) */
3344 ret
= probe_trace_event__set_name(tev
, pev
,
3347 ret
= show_probe_trace_event(tev
);
3350 strlist__delete(namelist
);
3355 int apply_perf_probe_events(struct perf_probe_event
*pevs
, int npevs
)
3359 /* Loop 2: add all events */
3360 for (i
= 0; i
< npevs
; i
++) {
3361 ret
= __add_probe_trace_events(&pevs
[i
], pevs
[i
].tevs
,
3363 probe_conf
.force_add
);
3370 void cleanup_perf_probe_events(struct perf_probe_event
*pevs
, int npevs
)
3373 struct perf_probe_event
*pev
;
3375 /* Loop 3: cleanup and free trace events */
3376 for (i
= 0; i
< npevs
; i
++) {
3378 for (j
= 0; j
< pevs
[i
].ntevs
; j
++)
3379 clear_probe_trace_event(&pevs
[i
].tevs
[j
]);
3380 zfree(&pevs
[i
].tevs
);
3382 nsinfo__zput(pev
->nsi
);
3383 clear_perf_probe_event(&pevs
[i
]);
3387 int add_perf_probe_events(struct perf_probe_event
*pevs
, int npevs
)
3391 ret
= init_probe_symbol_maps(pevs
->uprobes
);
3395 ret
= convert_perf_probe_events(pevs
, npevs
);
3397 ret
= apply_perf_probe_events(pevs
, npevs
);
3399 cleanup_perf_probe_events(pevs
, npevs
);
3401 exit_probe_symbol_maps();
3405 int del_perf_probe_events(struct strfilter
*filter
)
3407 int ret
, ret2
, ufd
= -1, kfd
= -1;
3408 char *str
= strfilter__string(filter
);
3413 /* Get current event names */
3414 ret
= probe_file__open_both(&kfd
, &ufd
, PF_FL_RW
);
3418 ret
= probe_file__del_events(kfd
, filter
);
3419 if (ret
< 0 && ret
!= -ENOENT
)
3422 ret2
= probe_file__del_events(ufd
, filter
);
3423 if (ret2
< 0 && ret2
!= -ENOENT
) {
3440 int show_available_funcs(const char *target
, struct nsinfo
*nsi
,
3441 struct strfilter
*_filter
, bool user
)
3447 ret
= init_probe_symbol_maps(user
);
3451 /* Get a symbol map */
3452 map
= get_target_map(target
, nsi
, user
);
3454 pr_err("Failed to get a map for %s\n", (target
) ? : "kernel");
3458 ret
= map__load(map
);
3461 char *str
= strfilter__string(_filter
);
3462 pr_err("Failed to find symbols matched to \"%s\"\n",
3466 pr_err("Failed to load symbols in %s\n",
3467 (target
) ? : "kernel");
3470 if (!dso__sorted_by_name(map
->dso
, map
->type
))
3471 dso__sort_by_name(map
->dso
, map
->type
);
3473 /* Show all (filtered) symbols */
3476 for (nd
= rb_first(&map
->dso
->symbol_names
[map
->type
]); nd
; nd
= rb_next(nd
)) {
3477 struct symbol_name_rb_node
*pos
= rb_entry(nd
, struct symbol_name_rb_node
, rb_node
);
3479 if (strfilter__compare(_filter
, pos
->sym
.name
))
3480 printf("%s\n", pos
->sym
.name
);
3485 exit_probe_symbol_maps();
3490 int copy_to_probe_trace_arg(struct probe_trace_arg
*tvar
,
3491 struct perf_probe_arg
*pvar
)
3493 tvar
->value
= strdup(pvar
->var
);
3494 if (tvar
->value
== NULL
)
3497 tvar
->type
= strdup(pvar
->type
);
3498 if (tvar
->type
== NULL
)
3502 tvar
->name
= strdup(pvar
->name
);
3503 if (tvar
->name
== NULL
)