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Diffstat (limited to 'kernel/trace/trace_kprobe.c')
-rw-r--r--kernel/trace/trace_kprobe.c139
1 files changed, 62 insertions, 77 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 6178abf3637..1251e367bae 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -635,12 +635,12 @@ static int create_trace_probe(int argc, char **argv)
event = strchr(group, '/') + 1;
event[-1] = '\0';
if (strlen(group) == 0) {
- pr_info("Group name is not specifiled\n");
+ pr_info("Group name is not specified\n");
return -EINVAL;
}
}
if (strlen(event) == 0) {
- pr_info("Event name is not specifiled\n");
+ pr_info("Event name is not specified\n");
return -EINVAL;
}
}
@@ -673,7 +673,7 @@ static int create_trace_probe(int argc, char **argv)
return -EINVAL;
}
/* an address specified */
- ret = strict_strtoul(&argv[0][2], 0, (unsigned long *)&addr);
+ ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr);
if (ret) {
pr_info("Failed to parse address.\n");
return ret;
@@ -1155,86 +1155,66 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
return 0;
}
-static int __probe_event_show_format(struct trace_seq *s,
- struct trace_probe *tp, const char *fmt,
- const char *arg)
+static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
{
int i;
+ int pos = 0;
- /* Show format */
- if (!trace_seq_printf(s, "\nprint fmt: \"%s", fmt))
- return 0;
+ const char *fmt, *arg;
- for (i = 0; i < tp->nr_args; i++)
- if (!trace_seq_printf(s, " %s=%%lx", tp->args[i].name))
- return 0;
+ if (!probe_is_return(tp)) {
+ fmt = "(%lx)";
+ arg = "REC->" FIELD_STRING_IP;
+ } else {
+ fmt = "(%lx <- %lx)";
+ arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
+ }
- if (!trace_seq_printf(s, "\", %s", arg))
- return 0;
+ /* When len=0, we just calculate the needed length */
+#define LEN_OR_ZERO (len ? len - pos : 0)
- for (i = 0; i < tp->nr_args; i++)
- if (!trace_seq_printf(s, ", REC->%s", tp->args[i].name))
- return 0;
+ pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
- return trace_seq_puts(s, "\n");
-}
+ for (i = 0; i < tp->nr_args; i++) {
+ pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%%lx",
+ tp->args[i].name);
+ }
-#undef SHOW_FIELD
-#define SHOW_FIELD(type, item, name) \
- do { \
- ret = trace_seq_printf(s, "\tfield:" #type " %s;\t" \
- "offset:%u;\tsize:%u;\tsigned:%d;\n", name,\
- (unsigned int)offsetof(typeof(field), item),\
- (unsigned int)sizeof(type), \
- is_signed_type(type)); \
- if (!ret) \
- return 0; \
- } while (0)
+ pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
-static int kprobe_event_show_format(struct ftrace_event_call *call,
- struct trace_seq *s)
-{
- struct kprobe_trace_entry field __attribute__((unused));
- int ret, i;
- struct trace_probe *tp = (struct trace_probe *)call->data;
-
- SHOW_FIELD(unsigned long, ip, FIELD_STRING_IP);
- SHOW_FIELD(int, nargs, FIELD_STRING_NARGS);
+ for (i = 0; i < tp->nr_args; i++) {
+ pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
+ tp->args[i].name);
+ }
- /* Show fields */
- for (i = 0; i < tp->nr_args; i++)
- SHOW_FIELD(unsigned long, args[i], tp->args[i].name);
- trace_seq_puts(s, "\n");
+#undef LEN_OR_ZERO
- return __probe_event_show_format(s, tp, "(%lx)",
- "REC->" FIELD_STRING_IP);
+ /* return the length of print_fmt */
+ return pos;
}
-static int kretprobe_event_show_format(struct ftrace_event_call *call,
- struct trace_seq *s)
+static int set_print_fmt(struct trace_probe *tp)
{
- struct kretprobe_trace_entry field __attribute__((unused));
- int ret, i;
- struct trace_probe *tp = (struct trace_probe *)call->data;
+ int len;
+ char *print_fmt;
- SHOW_FIELD(unsigned long, func, FIELD_STRING_FUNC);
- SHOW_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP);
- SHOW_FIELD(int, nargs, FIELD_STRING_NARGS);
+ /* First: called with 0 length to calculate the needed length */
+ len = __set_print_fmt(tp, NULL, 0);
+ print_fmt = kmalloc(len + 1, GFP_KERNEL);
+ if (!print_fmt)
+ return -ENOMEM;
- /* Show fields */
- for (i = 0; i < tp->nr_args; i++)
- SHOW_FIELD(unsigned long, args[i], tp->args[i].name);
- trace_seq_puts(s, "\n");
+ /* Second: actually write the @print_fmt */
+ __set_print_fmt(tp, print_fmt, len + 1);
+ tp->call.print_fmt = print_fmt;
- return __probe_event_show_format(s, tp, "(%lx <- %lx)",
- "REC->" FIELD_STRING_FUNC
- ", REC->" FIELD_STRING_RETIP);
+ return 0;
}
#ifdef CONFIG_PERF_EVENTS
/* Kprobe profile handler */
-static __kprobes void kprobe_profile_func(struct kprobe *kp,
+static __kprobes void kprobe_perf_func(struct kprobe *kp,
struct pt_regs *regs)
{
struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
@@ -1247,11 +1227,11 @@ static __kprobes void kprobe_profile_func(struct kprobe *kp,
__size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE,
+ if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
"profile buffer not large enough"))
return;
- entry = ftrace_perf_buf_prepare(size, call->id, &rctx, &irq_flags);
+ entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
if (!entry)
return;
@@ -1260,11 +1240,11 @@ static __kprobes void kprobe_profile_func(struct kprobe *kp,
for (i = 0; i < tp->nr_args; i++)
entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
- ftrace_perf_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags);
+ perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags, regs);
}
/* Kretprobe profile handler */
-static __kprobes void kretprobe_profile_func(struct kretprobe_instance *ri,
+static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
@@ -1277,11 +1257,11 @@ static __kprobes void kretprobe_profile_func(struct kretprobe_instance *ri,
__size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE,
+ if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
"profile buffer not large enough"))
return;
- entry = ftrace_perf_buf_prepare(size, call->id, &rctx, &irq_flags);
+ entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
if (!entry)
return;
@@ -1291,10 +1271,11 @@ static __kprobes void kretprobe_profile_func(struct kretprobe_instance *ri,
for (i = 0; i < tp->nr_args; i++)
entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
- ftrace_perf_buf_submit(entry, size, rctx, entry->ret_ip, 1, irq_flags);
+ perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1,
+ irq_flags, regs);
}
-static int probe_profile_enable(struct ftrace_event_call *call)
+static int probe_perf_enable(struct ftrace_event_call *call)
{
struct trace_probe *tp = (struct trace_probe *)call->data;
@@ -1306,7 +1287,7 @@ static int probe_profile_enable(struct ftrace_event_call *call)
return enable_kprobe(&tp->rp.kp);
}
-static void probe_profile_disable(struct ftrace_event_call *call)
+static void probe_perf_disable(struct ftrace_event_call *call)
{
struct trace_probe *tp = (struct trace_probe *)call->data;
@@ -1331,7 +1312,7 @@ int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
kprobe_trace_func(kp, regs);
#ifdef CONFIG_PERF_EVENTS
if (tp->flags & TP_FLAG_PROFILE)
- kprobe_profile_func(kp, regs);
+ kprobe_perf_func(kp, regs);
#endif
return 0; /* We don't tweek kernel, so just return 0 */
}
@@ -1345,7 +1326,7 @@ int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
kretprobe_trace_func(ri, regs);
#ifdef CONFIG_PERF_EVENTS
if (tp->flags & TP_FLAG_PROFILE)
- kretprobe_profile_func(ri, regs);
+ kretprobe_perf_func(ri, regs);
#endif
return 0; /* We don't tweek kernel, so just return 0 */
}
@@ -1359,30 +1340,33 @@ static int register_probe_event(struct trace_probe *tp)
if (probe_is_return(tp)) {
tp->event.trace = print_kretprobe_event;
call->raw_init = probe_event_raw_init;
- call->show_format = kretprobe_event_show_format;
call->define_fields = kretprobe_event_define_fields;
} else {
tp->event.trace = print_kprobe_event;
call->raw_init = probe_event_raw_init;
- call->show_format = kprobe_event_show_format;
call->define_fields = kprobe_event_define_fields;
}
+ if (set_print_fmt(tp) < 0)
+ return -ENOMEM;
call->event = &tp->event;
call->id = register_ftrace_event(&tp->event);
- if (!call->id)
+ if (!call->id) {
+ kfree(call->print_fmt);
return -ENODEV;
+ }
call->enabled = 0;
call->regfunc = probe_event_enable;
call->unregfunc = probe_event_disable;
#ifdef CONFIG_PERF_EVENTS
- call->profile_enable = probe_profile_enable;
- call->profile_disable = probe_profile_disable;
+ call->perf_event_enable = probe_perf_enable;
+ call->perf_event_disable = probe_perf_disable;
#endif
call->data = tp;
ret = trace_add_event_call(call);
if (ret) {
pr_info("Failed to register kprobe event: %s\n", call->name);
+ kfree(call->print_fmt);
unregister_ftrace_event(&tp->event);
}
return ret;
@@ -1392,6 +1376,7 @@ static void unregister_probe_event(struct trace_probe *tp)
{
/* tp->event is unregistered in trace_remove_event_call() */
trace_remove_event_call(&tp->call);
+ kfree(tp->call.print_fmt);
}
/* Make a debugfs interface for controling probe points */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-02-26 04:11:12 +0000