From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Sat, 17 Sep 2011 17:28:35 +0000 (-0400)
Subject: Use different event name for compat syscalls
X-Git-Tag: v2.0-pre9~32
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=b76dc1a0b1f4eb9f7ae754d2b44a431d9a24b1a5;p=lttng-modules.git

Use different event name for compat syscalls

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/instrumentation/syscalls/headers/syscalls_unknown.h b/instrumentation/syscalls/headers/syscalls_unknown.h
index 4b82f15d..7050387f 100644
--- a/instrumentation/syscalls/headers/syscalls_unknown.h
+++ b/instrumentation/syscalls/headers/syscalls_unknown.h
@@ -22,6 +22,19 @@ TRACE_EVENT(sys_unknown,
 	),
 	TP_printk()
 )
+TRACE_EVENT(compat_sys_unknown,
+	TP_PROTO(unsigned int id, unsigned long *args),
+	TP_ARGS(id, args),
+	TP_STRUCT__entry(
+		__field(unsigned int, id)
+		__array(unsigned long, args, UNKNOWN_SYSCALL_NRARGS)
+	),
+	TP_fast_assign(
+		tp_assign(id, id)
+		tp_memcpy(args, args, UNKNOWN_SYSCALL_NRARGS * sizeof(*args))
+	),
+	TP_printk()
+)
 /* 
  * This is going to hook on sys_exit in the kernel.
  * We change the name so we don't clash with the sys_exit syscall entry
diff --git a/ltt-events.h b/ltt-events.h
index dfab9a5f..e00714d0 100644
--- a/ltt-events.h
+++ b/ltt-events.h
@@ -243,6 +243,7 @@ struct ltt_channel {
 	struct ltt_transport *transport;
 	struct ltt_event **sc_table;	/* for syscall tracing */
 	struct ltt_event *sc_unknown;	/* for unknown syscalls */
+	struct ltt_event *sc_compat_unknown;
 	struct ltt_event *sc_exit;	/* for syscall exit */
 	int header_type;		/* 0: unset, 1: compact, 2: large */
 	int metadata_dumped:1;
diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 40bf9575..b712502b 100644
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -77,13 +77,11 @@ static struct trace_syscall_entry sc_table[] = {
 
 #undef CREATE_SYSCALL_TABLE
 
-static void syscall_entry_unknown(struct ltt_channel *chan,
+static void syscall_entry_unknown(struct ltt_event *event,
 	struct pt_regs *regs, unsigned int id)
 {
 	unsigned long args[UNKNOWN_SYSCALL_NRARGS];
-	struct ltt_event *event;
 
-	event = chan->sc_unknown;
 	syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args);
 	__event_probe__sys_unknown(event, id, args);
 }
@@ -99,13 +97,17 @@ static void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
 	struct ltt_channel *chan = __data;
 	struct ltt_event *event;
 
-	if (unlikely(is_compat_task() || id >= ARRAY_SIZE(sc_table))) {
-		syscall_entry_unknown(chan, regs, id);
+	if (unlikely(is_compat_task())) {
+		syscall_entry_unknown(chan->sc_compat_unknown, regs, id);
+		return;
+	}
+	if (unlikely(id >= ARRAY_SIZE(sc_table))) {
+		syscall_entry_unknown(chan->sc_unknown, regs, id);
 		return;
 	}
 	event = chan->sc_table[id];
 	if (unlikely(!event)) {
-		syscall_entry_unknown(chan, regs, id);
+		syscall_entry_unknown(chan->sc_unknown, regs, id);
 		return;
 	}
 	entry = &sc_table[id];
@@ -230,6 +232,22 @@ int lttng_syscalls_register(struct ltt_channel *chan, void *filter)
 		}
 	}
 
+	if (!chan->sc_compat_unknown) {
+		struct lttng_kernel_event ev;
+		const struct lttng_event_desc *desc =
+			&__event_desc___compat_sys_unknown;
+
+		memset(&ev, 0, sizeof(ev));
+		strncpy(ev.name, desc->name, LTTNG_SYM_NAME_LEN);
+		ev.name[LTTNG_SYM_NAME_LEN - 1] = '\0';
+		ev.instrumentation = LTTNG_KERNEL_NOOP;
+		chan->sc_compat_unknown = ltt_event_create(chan, &ev, filter,
+							   desc);
+		if (!chan->sc_compat_unknown) {
+			return -EINVAL;
+		}
+	}
+
 	if (!chan->sc_exit) {
 		struct lttng_kernel_event ev;
 		const struct lttng_event_desc *desc =