init

Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>

Makefile

@@ -1,12 +1,13 @@
-KDIR=/usr/src/kernels/$(shell uname -r)
+KDIR=/mnt/mainline
+#KDIR=/usr/src/kernels/$(shell uname -r)
 
 obj-m += demo.o
 obj-m += blk_kprobe.o
 obj-m += kobject-example.o
+obj-m += kprobe_trace.o
 
 all:
 	make -C $(KDIR) M=$(shell pwd) modules
 
 clean:
 	make -C $(KDIR) M=$(shell pwd) clean
-

kprobe_trace.c

@@ -0,0 +1,86 @@
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+struct test_struct {
+	int val;
+	int arr[3];
+	int *parr;
+	char name[8];
+	char *pname;
+};
+
+void test_func1(struct test_struct *p);
+void test_func2(struct test_struct p);
+
+void test_func1(struct test_struct *p)
+{
+	printk("%s\n", p->name);
+	printk("%s\n", p->pname);
+	printk("%d\n", p->arr[1]);
+	printk("%d\n", p->parr[1]);
+}
+
+void test_func2(struct test_struct p)
+{
+	printk("%s\n", p.name);
+	printk("%s\n", p.pname);
+	printk("%d\n", p.arr[1]);
+	printk("%d\n", p.parr[1]);
+}
+
+static ssize_t foo_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+	struct test_struct a;
+
+	a.val = 10;
+	sprintf(a.name, "hwc");
+	a.pname="njit";
+
+	for (int i = 0; i < 3; i++)
+		a.arr[i] = i;
+	a.parr = a.arr;
+
+	test_func1(&a);
+	test_func2(a);
+
+	return 0;
+}
+
+static struct kobj_attribute foo_attribute =
+	__ATTR(foo, 0444, foo_show, NULL);
+
+static struct attribute *attrs[] = {
+	&foo_attribute.attr,
+	NULL,
+};
+
+static struct attribute_group attr_group = {
+	.attrs = attrs,
+};
+
+static struct kobject *example_kobj;
+static int __init example_init(void)
+{
+	int retval;
+
+	example_kobj = kobject_create_and_add("kprobe_ftrace", kernel_kobj);
+	if (!example_kobj)
+		return -ENOMEM;
+
+	retval = sysfs_create_group(example_kobj, &attr_group);
+	if (retval)
+		kobject_put(example_kobj);
+
+	return retval;
+}
+static void __exit example_exit(void)
+{
+	kobject_put(example_kobj);
+}
+module_init(example_init);
+module_exit(example_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>");

probe.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+echo 0 > /sys/kernel/debug/tracing/tracing_on
+if [ -f /sys/kernel/debug/tracing/events/kprobes/enable ]; then
+	echo 0 > /sys/kernel/debug/tracing/events/kprobes/enable
+fi
+echo > /sys/kernel/debug/tracing/kprobe_events
+
+# struct test_struct {
+# 	int val;
+# 	int arr[3];
+# 	int *parr;
+# 	char name[8];
+# 	char *pname;
+# };
+# void test_func1(struct test_struct *p);
+# void test_func2(struct test_struct p);
+
+echo 'p:test_func1 test_func1 val=+0($arg1):s32 arr=+4($arg1):s32[3] parr=+0(+16($arg1)):s32[3] name=+24($arg1):string pname=+0(+32($arg1)):string' >> /sys/kernel/debug/tracing/kprobe_events
+echo 'p:test_func2 test_func2 val=+0($arg1):s32 arr=+4($arg1):s32[3] parr=+0(+16($arg1)):s32[3] name=+24($arg1):string pname=+0(+32($arg1)):string' >> /sys/kernel/debug/tracing/kprobe_events
+
+echo 1 > /sys/kernel/debug/tracing/options/sym-offset
+echo 0 > /sys/kernel/debug/tracing/options/stacktrace
+echo 1 > /sys/kernel/debug/tracing/events/kprobes/enable
+echo 1 > /sys/kernel/debug/tracing/tracing_on
+