From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 23 Oct 2015 23:29:34 +0000 (-0400)
Subject: Instrument x86 page faults
X-Git-Tag: v2.8.0-rc1~61
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=da0f6c58f715087f5091551070bf4350bf2768bf;p=lttng-modules.git

Instrument x86 page faults

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

diff --git a/instrumentation/events/lttng-module/arch/x86/exceptions.h b/instrumentation/events/lttng-module/arch/x86/exceptions.h
new file mode 100644
index 00000000..222841e3
--- /dev/null
+++ b/instrumentation/events/lttng-module/arch/x86/exceptions.h
@@ -0,0 +1,52 @@
+#if !defined(LTTNG_TRACE_EXCEPTIONS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define LTTNG_TRACE_EXCEPTIONS_H
+
+#include "../../../../../probes/lttng-tracepoint-event.h"
+#include <linux/version.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM x86_exceptions
+
+LTTNG_TRACEPOINT_EVENT_CLASS(x86_exceptions_class,
+
+	TP_PROTO(unsigned long address, struct pt_regs *regs,
+		unsigned long error_code),
+
+	TP_ARGS(address, regs, error_code),
+
+	TP_FIELDS(
+		ctf_integer_hex(unsigned long, address, address)
+		ctf_integer_hex(unsigned long, ip, regs->ip)
+		/*
+		 * Note: we cast error_code from unsigned long
+		 * to unsigned char to save space in the trace.
+		 * Currently, only 5 low bits are used. Should be made
+		 * larger if error codes are added to the kernel.
+		 */
+		ctf_integer_hex(unsigned char, error_code, error_code)
+	)
+)
+
+#define LTTNG_EXCEPTIONS_TRACEPOINT_EVENT_INSTANCE_MAP(name, map)	\
+LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(x86_exceptions_class,		\
+	name,								\
+	map,								\
+	TP_PROTO(unsigned long address, struct pt_regs *regs,		\
+		unsigned long error_code),				\
+	TP_ARGS(address, regs, error_code)				\
+)
+
+LTTNG_EXCEPTIONS_TRACEPOINT_EVENT_INSTANCE_MAP(page_fault_user,
+		x86_exceptions_page_fault_user)
+LTTNG_EXCEPTIONS_TRACEPOINT_EVENT_INSTANCE_MAP(page_fault_kernel,
+		x86_exceptions_page_fault_kernel)
+
+#endif /* LTTNG_TRACE_EXCEPTIONS_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../instrumentation/events/lttng-module/arch/x86
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE exceptions
+
+/* This part must be outside protection */
+#include "../../../../../probes/define_trace.h"
diff --git a/probes/Makefile b/probes/Makefile
index 9fbae81f..8a068c16 100644
--- a/probes/Makefile
+++ b/probes/Makefile
@@ -49,10 +49,17 @@ endif
 endif
 
 ifneq ($(CONFIG_X86),)
+
 x86_irq_vectors_dep = $(srctree)/arch/x86/include/asm/trace/irq_vectors.h
 ifneq ($(wildcard $(x86_irq_vectors_dep)),)
 obj-m += lttng-probe-x86-irq-vectors.o
 endif
+
+x86_exceptions_dep = $(srctree)/arch/x86/include/asm/trace/exceptions.h
+ifneq ($(wildcard $(x86_exceptions_dep)),)
+obj-m += lttng-probe-x86-exceptions.o
+endif
+
 endif
 
 obj-m +=  $(shell \
diff --git a/probes/lttng-probe-x86-exceptions.c b/probes/lttng-probe-x86-exceptions.c
new file mode 100644
index 00000000..a8c9bf32
--- /dev/null
+++ b/probes/lttng-probe-x86-exceptions.c
@@ -0,0 +1,52 @@
+/*
+ * probes/lttng-probe-x86-exceptions.c
+ *
+ * LTTng x86 exceptions probes.
+ *
+ * Copyright (C) 2010-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include "../lttng-tracer.h"
+
+/*
+ * Create the tracepoint static inlines from the kernel to validate that our
+ * trace event macros match the kernel we run on.
+ */
+#include <asm/trace/exceptions.h>
+
+#include "../wrapper/tracepoint.h"
+
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+
+/*
+ * Create LTTng tracepoint probes.
+ */
+#define LTTNG_PACKAGE_BUILD
+#define CREATE_TRACE_POINTS
+#define TRACE_INCLUDE_PATH ../instrumentation/events/lttng-module/arch/x86
+
+#include "../instrumentation/events/lttng-module/arch/x86/exceptions.h"
+
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
+MODULE_DESCRIPTION("LTTng x86 exceptions probes");
+MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
+	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
+	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
+	LTTNG_MODULES_EXTRAVERSION);