kernel debug tools...

2026-09-22 20:53:34 +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 +1,75 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/debugfs.h> /* this is for DebugFS libraries */
+#include <linux/fs.h>
+
+// http://opensourceforu.com/2010/10/debugging-linux-kernel-with-debugfs/
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Surya Prabhakar <surya_prabhakar@dell.com>");
+MODULE_DESCRIPTION("sample code for DebugFS functionality");
+
+#define len 200
+
+u64                 intvalue,hexvalue;
+struct dentry       *dirret,*fileret,*u64int,*u64hex;
+char                ker_buf[len];
+int                 filevalue;
+
+
+/* read file operation */
+static ssize_t myreader(struct file *fp,
+                        char __user *user_buffer,
+                        size_t count,
+                        loff_t *position)
+{
+     return simple_read_from_buffer(user_buffer, count, position, ker_buf, len);
+}
+
+/* write file operation */
+static ssize_t mywriter(struct file *fp, const char __user *user_buffer,
+                                size_t count, loff_t *position)
+{
+        if(count > len)
+                return -EINVAL;
+
+        return simple_write_to_buffer(ker_buf, len, position, user_buffer, count);
+}
+
+static const struct file_operations fops_debug = {
+        .read = myreader,
+        .write = mywriter,
+};
+
+static int __init init_debug(void)
+{
+    /* create a directory by the name dell in /sys/kernel/debugfs */
+    dirret = debugfs_create_dir("gatieme_mydebug", NULL);
+
+    /* create a file in the above directory
+    This requires read and write file operations */
+    fileret = debugfs_create_file("text", 0644, dirret, &filevalue, &fops_debug);
+
+    /* create a file which takes in a int(64) value */
+    u64int = debugfs_create_u64("number", 0644, dirret, &intvalue);
+    if (!u64int) {
+        printk("error creating int file");
+        return (-ENODEV);
+    }
+    /* takes a hex decimal value */
+    u64hex = debugfs_create_x64("hexnum", 0644, dirret, &hexvalue );
+    if (!u64hex) {
+        printk("error creating hex file");
+        return (-ENODEV);
+    }
+
+    return (0);
+}
+module_init(init_debug);
+
+static void __exit exit_debug(void)
+{
+    /* removing the directory recursively which
+    in turn cleans all the file */
+    debugfs_remove_recursive(dirret);
+}
+module_exit(exit_debug);