kernel debug tools...

2026-09-21 03:43:38 +08:00 · 2017-03-30 13:07:38 +08:00
parent 62b53701c3
commit 94b32eff7c
57 changed files with 108 additions and 0 deletions
@@ -0,0 +1,83 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+ROOT=..
+#PLATFORM=$(shell $(ROOT)/systype.sh)
+#include $(ROOT)/Make.defines.$(PLATFORM)
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := my_debugfs
+MODCFLAGS:=-O6 -Wall -DMODULE -D__KERNEL__ -DLINUX -std=c99
+
+
+
+ifneq ($(KERNELRELEASE),)
+
+#CFG_FLAGS += -O2  -I./
+#EXTRA_CFLAGS  += $(C_FLAGS) $(CFG_INC) $(CFG_INC)
+
+
+
+obj-m := $(MODULE_NAME).o #print_vmarea.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+modules:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	cat /sys/kernel/debug/mydebug/a
+	cat /sys/kernel/debug/mydebug/b
+	cat /sys/kernel/debug/mydebug/subdir/c
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
+
+endif
+
@@ -0,0 +1,108 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <asm/uaccess.h>
+
+//  http://files.cnblogs.com/wwang/debugfs.zip
+
+struct dentry *my_debugfs_root;
+
+u8                          a           = 0;
+char                        hello[32]   = "Hello world!\n";
+struct debugfs_blob_wrapper b;
+
+static int c_open(struct inode *inode, struct file *filp)
+{
+	filp->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t c_read(struct file *filp, char __user *buffer,
+		size_t count, loff_t *ppos)
+{
+	if (*ppos >= 32)
+		return 0;
+	if (*ppos + count > 32)
+		count = 32 - *ppos;
+
+	if (copy_to_user(buffer, hello + *ppos, count))
+		return -EFAULT;
+
+	*ppos += count;
+
+	return count;
+}
+
+static ssize_t c_write(struct file *filp, const char __user *buffer,
+		size_t count, loff_t *ppos)
+{
+	if (*ppos >= 32)
+		return 0;
+	if (*ppos + count > 32)
+		count = 32 - *ppos;
+
+	if (copy_from_user(hello + *ppos, buffer, count))
+		return -EFAULT;
+
+	*ppos += count;
+
+	return count;
+}
+
+struct file_operations c_fops = {
+	.owner = THIS_MODULE,
+	.open = c_open,
+	.read = c_read,
+	.write = c_write,
+};
+
+static int __init mydebugfs_init(void)
+{
+	struct dentry *sub_dir, *r_a, *r_b, *s_c;
+
+        printk(KERN_INFO "mydebugfs_init\n");
+
+	my_debugfs_root = debugfs_create_dir("gatieme_mydebug", NULL);
+	if (!my_debugfs_root)
+		return -ENOENT;
+
+	r_a = debugfs_create_u8("a", 0644, my_debugfs_root, &a);
+	if (!r_a)
+		goto Fail;
+
+	b.data = (void *)hello;
+	b.size = strlen(hello) + 1;
+	r_b = debugfs_create_blob("b", 0644, my_debugfs_root, &b);
+	if (!r_b)
+		goto Fail;
+
+	sub_dir = debugfs_create_dir("subdir", my_debugfs_root);
+	if (!sub_dir)
+		goto Fail;
+
+	s_c = debugfs_create_file("c", 0644, sub_dir, NULL, &c_fops);
+	if (!s_c)
+		goto Fail;
+
+        return 0;
+
+Fail:
+	debugfs_remove_recursive(my_debugfs_root);
+	my_debugfs_root = NULL;
+	return -ENOENT;
+}
+
+static void __exit mydebugfs_exit(void)
+{
+    printk(KERN_INFO "mydebugfs_exit\n");
+	debugfs_remove_recursive(my_debugfs_root);
+
+    return;
+}
+
+module_init(mydebugfs_init);
+module_exit(mydebugfs_exit);
+
+MODULE_LICENSE("GPL");
+