#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 3
#define MAX_PATH_LEN 256
#define MAX_PROBES 128
-#define MAX_PROBE_ARGS 128
-#define PERFPROBE_GROUP "probe"
/* Session management structure */
static struct {
struct probe_point probes[MAX_PROBES];
} session;
-#define semantic_error(msg ...) die("Semantic error :" msg)
-
-/* Parse probe point. Return 1 if return probe */
-static void parse_probe_point(char *arg, struct probe_point *pp)
-{
- char *ptr, *tmp;
- char c, nc = 0;
- /*
- * <Syntax>
- * perf probe SRC:LN
- * perf probe FUNC[+OFFS|%return][@SRC]
- */
-
- ptr = strpbrk(arg, ":+@%");
- if (ptr) {
- nc = *ptr;
- *ptr++ = '\0';
- }
-
- /* Check arg is function or file and copy it */
- if (strchr(arg, '.')) /* File */
- pp->file = strdup(arg);
- else /* Function */
- pp->function = strdup(arg);
- DIE_IF(pp->file == NULL && pp->function == NULL);
-
- /* Parse other options */
- while (ptr) {
- arg = ptr;
- c = nc;
- ptr = strpbrk(arg, ":+@%");
- if (ptr) {
- nc = *ptr;
- *ptr++ = '\0';
- }
- switch (c) {
- case ':': /* Line number */
- pp->line = strtoul(arg, &tmp, 0);
- if (*tmp != '\0')
- semantic_error("There is non-digit charactor"
- " in line number.");
- break;
- case '+': /* Byte offset from a symbol */
- pp->offset = strtoul(arg, &tmp, 0);
- if (*tmp != '\0')
- semantic_error("There is non-digit charactor"
- " in offset.");
- break;
- case '@': /* File name */
- if (pp->file)
- semantic_error("SRC@SRC is not allowed.");
- pp->file = strdup(arg);
- DIE_IF(pp->file == NULL);
- if (ptr)
- semantic_error("@SRC must be the last "
- "option.");
- break;
- case '%': /* Probe places */
- if (strcmp(arg, "return") == 0) {
- pp->retprobe = 1;
- } else /* Others not supported yet */
- semantic_error("%%%s is not supported.", arg);
- break;
- default:
- DIE_IF("Program has a bug.");
- break;
- }
- }
-
- /* Exclusion check */
- if (pp->line && pp->offset)
- semantic_error("Offset can't be used with line number.");
- if (!pp->line && pp->file && !pp->function)
- semantic_error("File always requires line number.");
- if (pp->offset && !pp->function)
- semantic_error("Offset requires an entry function.");
- if (pp->retprobe && !pp->function)
- semantic_error("Return probe requires an entry function.");
- if ((pp->offset || pp->line) && pp->retprobe)
- semantic_error("Offset/Line can't be used with return probe.");
-
- pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n",
- pp->function, pp->file, pp->line, pp->offset, pp->retprobe);
-}
-
/* Parse an event definition. Note that any error must die. */
static void parse_probe_event(const char *str)
{
- char *argv[MAX_PROBE_ARGS + 1]; /* probe + args */
- int argc, i;
struct probe_point *pp = &session.probes[session.nr_probe];
pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
if (++session.nr_probe == MAX_PROBES)
- semantic_error("Too many probes");
-
- /* Separate arguments, similar to argv_split */
- argc = 0;
- do {
- /* Skip separators */
- while (isspace(*str))
- str++;
-
- /* Add an argument */
- if (*str != '\0') {
- const char *s = str;
- /* Check the limit number of arguments */
- if (argc == MAX_PROBE_ARGS + 1)
- semantic_error("Too many arguments");
-
- /* Skip the argument */
- while (!isspace(*str) && *str != '\0')
- str++;
-
- /* Duplicate the argument */
- argv[argc] = strndup(s, str - s);
- if (argv[argc] == NULL)
- die("strndup");
- pr_debug("argv[%d]=%s\n", argc, argv[argc]);
- argc++;
-
- }
- } while (*str != '\0');
- if (!argc)
- semantic_error("An empty argument.");
-
- /* Parse probe point */
- parse_probe_point(argv[0], pp);
- free(argv[0]);
- if (pp->file || pp->line)
- session.need_dwarf = 1;
-
- /* Copy arguments */
- pp->nr_args = argc - 1;
- if (pp->nr_args > 0) {
- pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
- if (!pp->args)
- die("malloc");
- memcpy(pp->args, &argv[1], sizeof(char *) * pp->nr_args);
- }
+ die("Too many probes (> %d) are specified.", MAX_PROBES);
- /* Ensure return probe has no C argument */
- for (i = 0; i < pp->nr_args; i++)
- if (is_c_varname(pp->args[i])) {
- if (pp->retprobe)
- semantic_error("You can't specify local"
- " variable for kretprobe");
- session.need_dwarf = 1;
- }
+ /* Parse perf-probe event into probe_point */
+ session.need_dwarf = parse_perf_probe_event(str, pp);
pr_debug("%d arguments\n", pp->nr_args);
}
"\t\tALN:\tAbsolute line number in file.\n"
"\t\tARG:\tProbe argument (local variable name or\n"
#endif
- "\t\t\tkprobe-tracer argument format is supported.)\n",
+ "\t\t\tkprobe-tracer argument format.)\n",
opt_add_probe_event),
OPT_END()
};
-static int write_new_event(int fd, const char *buf)
-{
- int ret;
-
- ret = write(fd, buf, strlen(buf));
- if (ret <= 0)
- die("Failed to create event.");
- else
- printf("Added new event: %s\n", buf);
-
- return ret;
-}
-
-#define MAX_CMDLEN 256
-
-static int synthesize_probe_event(struct probe_point *pp)
-{
- char *buf;
- int i, len, ret;
- pp->probes[0] = buf = zalloc(MAX_CMDLEN);
- if (!buf)
- die("Failed to allocate memory by zalloc.");
- ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
- if (ret <= 0 || ret >= MAX_CMDLEN)
- goto error;
- len = ret;
-
- for (i = 0; i < pp->nr_args; i++) {
- ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
- pp->args[i]);
- if (ret <= 0 || ret >= MAX_CMDLEN - len)
- goto error;
- len += ret;
- }
- pp->found = 1;
- return pp->found;
-error:
- free(pp->probes[0]);
- if (ret > 0)
- ret = -E2BIG;
- return ret;
-}
-
int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
int i, j, fd, ret;
struct probe_point *pp;
- char buf[MAX_CMDLEN];
argc = parse_options(argc, argv, options, probe_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (session.need_dwarf)
#ifdef NO_LIBDWARF
- semantic_error("Debuginfo-analysis is not supported");
+ die("Debuginfo-analysis is not supported");
#else /* !NO_LIBDWARF */
pr_debug("Some probes require debuginfo.\n");
if (pp->found) /* This probe is already found. */
continue;
- ret = synthesize_probe_event(pp);
+ ret = synthesize_trace_kprobe_event(pp);
if (ret == -E2BIG)
- semantic_error("probe point is too long.");
+ die("probe point definition becomes too long.");
else if (ret < 0)
die("Failed to synthesize a probe point.");
}
/* Settng up probe points */
- snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
- fd = open(buf, O_WRONLY, O_APPEND);
- if (fd < 0) {
- if (errno == ENOENT)
- die("kprobe_events file does not exist - please rebuild with CONFIG_KPROBE_TRACER.");
- else
- die("Could not open kprobe_events file: %s",
- strerror(errno));
- }
- for (j = 0; j < session.nr_probe; j++) {
- pp = &session.probes[j];
- if (pp->found == 1) {
- snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x %s\n",
- pp->retprobe ? 'r' : 'p', PERFPROBE_GROUP,
- pp->function, pp->offset, pp->probes[0]);
- write_new_event(fd, buf);
- } else
- for (i = 0; i < pp->found; i++) {
- snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x_%d %s\n",
- pp->retprobe ? 'r' : 'p',
- PERFPROBE_GROUP,
- pp->function, pp->offset, i,
- pp->probes[i]);
- write_new_event(fd, buf);
- }
- }
- close(fd);
+ add_trace_kprobe_events(session.probes, session.nr_probe);
return 0;
}
--- /dev/null
+/*
+ * probe-event.c : perf-probe definition to kprobe_events format converter
+ *
+ * Written by Masami Hiramatsu <mhiramat@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <sys/utsname.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#undef _GNU_SOURCE
+#include "event.h"
+#include "debug.h"
+#include "parse-events.h" /* For debugfs_path */
+#include "probe-event.h"
+
+#define MAX_CMDLEN 256
+#define MAX_PROBE_ARGS 128
+#define PERFPROBE_GROUP "probe"
+
+#define semantic_error(msg ...) die("Semantic error :" msg)
+
+/* Parse probepoint definition. */
+static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
+{
+ char *ptr, *tmp;
+ char c, nc = 0;
+ /*
+ * <Syntax>
+ * perf probe SRC:LN
+ * perf probe FUNC[+OFFS|%return][@SRC]
+ */
+
+ ptr = strpbrk(arg, ":+@%");
+ if (ptr) {
+ nc = *ptr;
+ *ptr++ = '\0';
+ }
+
+ /* Check arg is function or file and copy it */
+ if (strchr(arg, '.')) /* File */
+ pp->file = strdup(arg);
+ else /* Function */
+ pp->function = strdup(arg);
+ DIE_IF(pp->file == NULL && pp->function == NULL);
+
+ /* Parse other options */
+ while (ptr) {
+ arg = ptr;
+ c = nc;
+ ptr = strpbrk(arg, ":+@%");
+ if (ptr) {
+ nc = *ptr;
+ *ptr++ = '\0';
+ }
+ switch (c) {
+ case ':': /* Line number */
+ pp->line = strtoul(arg, &tmp, 0);
+ if (*tmp != '\0')
+ semantic_error("There is non-digit charactor"
+ " in line number.");
+ break;
+ case '+': /* Byte offset from a symbol */
+ pp->offset = strtoul(arg, &tmp, 0);
+ if (*tmp != '\0')
+ semantic_error("There is non-digit charactor"
+ " in offset.");
+ break;
+ case '@': /* File name */
+ if (pp->file)
+ semantic_error("SRC@SRC is not allowed.");
+ pp->file = strdup(arg);
+ DIE_IF(pp->file == NULL);
+ if (ptr)
+ semantic_error("@SRC must be the last "
+ "option.");
+ break;
+ case '%': /* Probe places */
+ if (strcmp(arg, "return") == 0) {
+ pp->retprobe = 1;
+ } else /* Others not supported yet */
+ semantic_error("%%%s is not supported.", arg);
+ break;
+ default:
+ DIE_IF("Program has a bug.");
+ break;
+ }
+ }
+
+ /* Exclusion check */
+ if (pp->line && pp->offset)
+ semantic_error("Offset can't be used with line number.");
+
+ if (!pp->line && pp->file && !pp->function)
+ semantic_error("File always requires line number.");
+
+ if (pp->offset && !pp->function)
+ semantic_error("Offset requires an entry function.");
+
+ if (pp->retprobe && !pp->function)
+ semantic_error("Return probe requires an entry function.");
+
+ if ((pp->offset || pp->line) && pp->retprobe)
+ semantic_error("Offset/Line can't be used with return probe.");
+
+ pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n",
+ pp->function, pp->file, pp->line, pp->offset, pp->retprobe);
+}
+
+/* Parse perf-probe event definition */
+int parse_perf_probe_event(const char *str, struct probe_point *pp)
+{
+ char *argv[MAX_PROBE_ARGS + 1]; /* probe + args */
+ int argc, i, need_dwarf = 0;
+
+ /* Separate arguments, similar to argv_split */
+ argc = 0;
+ do {
+ /* Skip separators */
+ while (isspace(*str))
+ str++;
+
+ /* Add an argument */
+ if (*str != '\0') {
+ const char *s = str;
+ /* Check the limit number of arguments */
+ if (argc == MAX_PROBE_ARGS + 1)
+ semantic_error("Too many arguments");
+
+ /* Skip the argument */
+ while (!isspace(*str) && *str != '\0')
+ str++;
+
+ /* Duplicate the argument */
+ argv[argc] = strndup(s, str - s);
+ if (argv[argc] == NULL)
+ die("strndup");
+ pr_debug("argv[%d]=%s\n", argc, argv[argc]);
+ argc++;
+ }
+ } while (*str != '\0');
+ if (!argc)
+ semantic_error("An empty argument.");
+
+ /* Parse probe point */
+ parse_perf_probe_probepoint(argv[0], pp);
+ free(argv[0]);
+ if (pp->file || pp->line)
+ need_dwarf = 1;
+
+ /* Copy arguments */
+ pp->nr_args = argc - 1;
+ if (pp->nr_args > 0) {
+ pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
+ if (!pp->args)
+ die("malloc");
+ memcpy(pp->args, &argv[1], sizeof(char *) * pp->nr_args);
+ }
+
+ /* Ensure return probe has no C argument */
+ for (i = 0; i < pp->nr_args; i++)
+ if (is_c_varname(pp->args[i])) {
+ if (pp->retprobe)
+ semantic_error("You can't specify local"
+ " variable for kretprobe");
+ need_dwarf = 1;
+ }
+
+ return need_dwarf;
+}
+
+int synthesize_trace_kprobe_event(struct probe_point *pp)
+{
+ char *buf;
+ int i, len, ret;
+
+ pp->probes[0] = buf = zalloc(MAX_CMDLEN);
+ if (!buf)
+ die("Failed to allocate memory by zalloc.");
+ ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
+ if (ret <= 0 || ret >= MAX_CMDLEN)
+ goto error;
+ len = ret;
+
+ for (i = 0; i < pp->nr_args; i++) {
+ ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
+ pp->args[i]);
+ if (ret <= 0 || ret >= MAX_CMDLEN - len)
+ goto error;
+ len += ret;
+ }
+ pp->found = 1;
+
+ return pp->found;
+error:
+ free(pp->probes[0]);
+ if (ret > 0)
+ ret = -E2BIG;
+
+ return ret;
+}
+
+static int write_trace_kprobe_event(int fd, const char *buf)
+{
+ int ret;
+
+ ret = write(fd, buf, strlen(buf));
+ if (ret <= 0)
+ die("Failed to create event.");
+ else
+ printf("Added new event: %s\n", buf);
+
+ return ret;
+}
+
+void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
+{
+ int i, j, fd;
+ struct probe_point *pp;
+ char buf[MAX_CMDLEN];
+
+ snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
+ fd = open(buf, O_WRONLY, O_APPEND);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ die("kprobe_events file does not exist -"
+ " please rebuild with CONFIG_KPROBE_TRACER.");
+ else
+ die("Could not open kprobe_events file: %s",
+ strerror(errno));
+ }
+
+ for (j = 0; j < nr_probes; j++) {
+ pp = probes + j;
+ if (pp->found == 1) {
+ snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x %s\n",
+ pp->retprobe ? 'r' : 'p', PERFPROBE_GROUP,
+ pp->function, pp->offset, pp->probes[0]);
+ write_trace_kprobe_event(fd, buf);
+ } else
+ for (i = 0; i < pp->found; i++) {
+ snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x_%d %s\n",
+ pp->retprobe ? 'r' : 'p',
+ PERFPROBE_GROUP,
+ pp->function, pp->offset, i,
+ pp->probes[i]);
+ write_trace_kprobe_event(fd, buf);
+ }
+ }
+ close(fd);
+}
projects / kernel.git / commitdiff