#include "util/strlist.h"
#include "util/event.h"
#include "util/debug.h"
+#include "util/debugfs.h"
+#include "util/symbol.h"
+#include "util/thread.h"
#include "util/parse-options.h"
#include "util/parse-events.h" /* For debugfs_path */
#include "util/probe-finder.h"
#include "util/probe-event.h"
-/* Default vmlinux search paths */
-#define NR_SEARCH_PATH 4
-const char *default_search_path[NR_SEARCH_PATH] = {
-"/lib/modules/%s/build/vmlinux", /* Custom build kernel */
-"/usr/lib/debug/lib/modules/%s/vmlinux", /* Red Hat debuginfo */
-"/boot/vmlinux-debug-%s", /* Ubuntu */
-"./vmlinux", /* CWD */
-};
-
#define MAX_PATH_LEN 256
-#define MAX_PROBES 128
/* Session management structure */
static struct {
- char *vmlinux;
- char *release;
bool need_dwarf;
bool list_events;
+ bool force_add;
+ bool show_lines;
int nr_probe;
struct probe_point probes[MAX_PROBES];
struct strlist *dellist;
+ struct map_groups kmap_groups;
+ struct map *kmaps[MAP__NR_TYPES];
+ struct line_range line_range;
} session;
return 0;
}
-#ifndef NO_LIBDWARF
-static int open_default_vmlinux(void)
+/* Currently just checking function name from symbol map */
+static void evaluate_probe_point(struct probe_point *pp)
{
- struct utsname uts;
- char fname[MAX_PATH_LEN];
- int fd, ret, i;
-
- ret = uname(&uts);
- if (ret) {
- pr_debug("uname() failed.\n");
- return -errno;
- }
- session.release = uts.release;
- for (i = 0; i < NR_SEARCH_PATH; i++) {
- ret = snprintf(fname, MAX_PATH_LEN,
- default_search_path[i], session.release);
- if (ret >= MAX_PATH_LEN || ret < 0) {
- pr_debug("Filename(%d,%s) is too long.\n", i,
- uts.release);
- errno = E2BIG;
- return -E2BIG;
- }
- pr_debug("try to open %s\n", fname);
- fd = open(fname, O_RDONLY);
- if (fd >= 0)
- break;
+ struct symbol *sym;
+ sym = map__find_symbol_by_name(session.kmaps[MAP__FUNCTION],
+ pp->function, NULL);
+ if (!sym)
+ die("Kernel symbol \'%s\' not found - probe not added.",
+ pp->function);
+}
+
+#ifndef NO_DWARF_SUPPORT
+static int open_vmlinux(void)
+{
+ if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) {
+ pr_debug("Failed to load kernel map.\n");
+ return -EINVAL;
}
- return fd;
+ pr_debug("Try to open %s\n",
+ session.kmaps[MAP__FUNCTION]->dso->long_name);
+ return open(session.kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
+}
+
+static int opt_show_lines(const struct option *opt __used,
+ const char *str, int unset __used)
+{
+ if (str)
+ parse_line_range_desc(str, &session.line_range);
+ INIT_LIST_HEAD(&session.line_range.line_list);
+ session.show_lines = true;
+ return 0;
}
#endif
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
+#ifndef NO_DWARF_SUPPORT
+ "perf probe --line 'LINEDESC'",
+#endif
NULL
};
static const struct option options[] = {
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show parsed arguments, etc)"),
-#ifndef NO_LIBDWARF
- OPT_STRING('k', "vmlinux", &session.vmlinux, "file",
- "vmlinux/module pathname"),
+#ifndef NO_DWARF_SUPPORT
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
#endif
OPT_BOOLEAN('l', "list", &session.list_events,
"list up current probe events"),
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
-#ifdef NO_LIBDWARF
- "FUNC[+OFFS|%return] [ARG ...]",
+#ifdef NO_DWARF_SUPPORT
+ "[EVENT=]FUNC[+OFF|%return] [ARG ...]",
#else
- "FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
+ "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
+ " [ARG ...]",
#endif
"probe point definition, where\n"
- "\t\tGRP:\tGroup name (optional)\n"
- "\t\tNAME:\tEvent name\n"
+ "\t\tGROUP:\tGroup name (optional)\n"
+ "\t\tEVENT:\tEvent name\n"
"\t\tFUNC:\tFunction name\n"
- "\t\tOFFS:\tOffset from function entry (in byte)\n"
+ "\t\tOFF:\tOffset from function entry (in byte)\n"
"\t\t%return:\tPut the probe at function return\n"
-#ifdef NO_LIBDWARF
+#ifdef NO_DWARF_SUPPORT
"\t\tARG:\tProbe argument (only \n"
#else
"\t\tSRC:\tSource code path\n"
- "\t\tRLN:\tRelative line number from function entry.\n"
- "\t\tALN:\tAbsolute line number in file.\n"
+ "\t\tRL:\tRelative line number from function entry.\n"
+ "\t\tAL:\tAbsolute line number in file.\n"
+ "\t\tPT:\tLazy expression of line code.\n"
"\t\tARG:\tProbe argument (local variable name or\n"
#endif
"\t\t\tkprobe-tracer argument format.)\n",
opt_add_probe_event),
+ OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
+ " with existing name"),
+#ifndef NO_DWARF_SUPPORT
+ OPT_CALLBACK('L', "line", NULL,
+ "FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
+ "Show source code lines.", opt_show_lines),
+#endif
OPT_END()
};
+/* Initialize symbol maps for vmlinux */
+static void init_vmlinux(void)
+{
+ symbol_conf.sort_by_name = true;
+ if (symbol_conf.vmlinux_name == NULL)
+ symbol_conf.try_vmlinux_path = true;
+ else
+ pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
+ if (symbol__init() < 0)
+ die("Failed to init symbol map.");
+
+ map_groups__init(&session.kmap_groups);
+ if (map_groups__create_kernel_maps(&session.kmap_groups,
+ session.kmaps) < 0)
+ die("Failed to create kernel maps.");
+}
+
int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
int i, ret;
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
int fd;
#endif
struct probe_point *pp;
argc = parse_options(argc, argv, options, probe_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
- if (argc > 0)
+ if (argc > 0) {
+ if (strcmp(argv[0], "-") == 0) {
+ pr_warning(" Error: '-' is not supported.\n");
+ usage_with_options(probe_usage, options);
+ }
parse_probe_event_argv(argc, argv);
+ }
- if ((!session.nr_probe && !session.dellist && !session.list_events))
+ if ((!session.nr_probe && !session.dellist && !session.list_events &&
+ !session.show_lines))
usage_with_options(probe_usage, options);
+ if (debugfs_valid_mountpoint(debugfs_path) < 0)
+ die("Failed to find debugfs path.");
+
if (session.list_events) {
if (session.nr_probe != 0 || session.dellist) {
pr_warning(" Error: Don't use --list with"
" --add/--del.\n");
usage_with_options(probe_usage, options);
}
+ if (session.show_lines) {
+ pr_warning(" Error: Don't use --list with --line.\n");
+ usage_with_options(probe_usage, options);
+ }
show_perf_probe_events();
return 0;
}
+#ifndef NO_DWARF_SUPPORT
+ if (session.show_lines) {
+ if (session.nr_probe != 0 || session.dellist) {
+ pr_warning(" Error: Don't use --line with"
+ " --add/--del.\n");
+ usage_with_options(probe_usage, options);
+ }
+ init_vmlinux();
+ fd = open_vmlinux();
+ if (fd < 0)
+ die("Could not open debuginfo file.");
+ ret = find_line_range(fd, &session.line_range);
+ if (ret <= 0)
+ die("Source line is not found.\n");
+ close(fd);
+ show_line_range(&session.line_range);
+ return 0;
+ }
+#endif
+
if (session.dellist) {
del_trace_kprobe_events(session.dellist);
strlist__delete(session.dellist);
return 0;
}
+ /* Add probes */
+ init_vmlinux();
+
if (session.need_dwarf)
-#ifdef NO_LIBDWARF
+#ifdef NO_DWARF_SUPPORT
die("Debuginfo-analysis is not supported");
-#else /* !NO_LIBDWARF */
+#else /* !NO_DWARF_SUPPORT */
pr_debug("Some probes require debuginfo.\n");
- if (session.vmlinux) {
- pr_debug("Try to open %s.", session.vmlinux);
- fd = open(session.vmlinux, O_RDONLY);
- } else
- fd = open_default_vmlinux();
+ fd = open_vmlinux();
if (fd < 0) {
if (session.need_dwarf)
die("Could not open debuginfo file.");
continue;
lseek(fd, SEEK_SET, 0);
- ret = find_probepoint(fd, pp);
- if (ret < 0) {
- if (session.need_dwarf)
- die("Could not analyze debuginfo.");
-
- pr_warning("An error occurred in debuginfo analysis. Try to use symbols.\n");
- break;
+ ret = find_probe_point(fd, pp);
+ if (ret > 0)
+ continue;
+ if (ret == 0) { /* No error but failed to find probe point. */
+ synthesize_perf_probe_point(pp);
+ die("Probe point '%s' not found. - probe not added.",
+ pp->probes[0]);
}
- if (ret == 0) /* No error but failed to find probe point. */
- die("No probe point found.");
+ /* Error path */
+ if (session.need_dwarf) {
+ if (ret == -ENOENT)
+ pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
+ die("Could not analyze debuginfo.");
+ }
+ pr_debug("An error occurred in debuginfo analysis."
+ " Try to use symbols.\n");
+ break;
}
close(fd);
end_dwarf:
-#endif /* !NO_LIBDWARF */
+#endif /* !NO_DWARF_SUPPORT */
/* Synthesize probes without dwarf */
for (i = 0; i < session.nr_probe; i++) {
if (pp->found) /* This probe is already found. */
continue;
+ evaluate_probe_point(pp);
ret = synthesize_trace_kprobe_event(pp);
if (ret == -E2BIG)
die("probe point definition becomes too long.");
}
/* Settng up probe points */
- add_trace_kprobe_events(session.probes, session.nr_probe);
+ add_trace_kprobe_events(session.probes, session.nr_probe,
+ session.force_add);
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff