插入我的内核模块时,INSMOD 退出并出现错误 "bad address",警告 "Kernel mismatch"
While inserting my kernel module INSMOD exits with error "bad address", warns about "Kernel mismatch"
我正在为自定义设备开发此模块,实际上,这是一个连接到 ISA 总线的 4*8 位 i-o 端口,地址为 0x0120 - 0x0123。此驱动程序基于 Alessandro Rubini 和 Jonathan Corbet 的 "scull"。我的 OS 是 Ubuntu 10.04,内核是 2.6.32-74 generic,我使用内置的面向控制台的编译器 gcc。
使用 "insmod" 插入已编译模块时出现错误 "bad address" 并且未加载模块。我尝试使用 "printk" 调试它,发现我的模块成功获取了一系列 i-o 端口、主要和次要编号,然后,当尝试执行 "Reset_Port" 功能时,它会生成错误 "bad address" 并退出。
谁能告诉我,我做错了什么?
这是我模块的 __exit 和 __init 功能
void __exit ET3201_exit(void)
{
int i;
dev_t devno = MKDEV(ET3201_major, ET3201_minor);
/* Get rid of our char dev entries */
if (ET3201_devices) {
for (i = 0; i < ET3201_nr_devs; i++) {
ET3201_trim(ET3201_devices + i);
cdev_del(&ET3201_devices[i].cdev);
}
kfree(ET3201_devices);
}
#ifdef ET3201_DEBUG /* use proc only if debugging */
ET3201_remove_proc();
#endif
/* cleanup_module is never called if registering failed */
unregister_chrdev_region(devno, ET3201_nr_devs);
if ( ! port ) release_region(BaseIO, 8);
printk(KERN_INFO "Goodbye, cruel world - ET3201 is unloaded\n");
/* and call the cleanup functions for friend devices */
/*ET3201_access_cleanup();*/
}
/*----------------------------------------------------------------------------*/
/* Set up the char_dev structure for this device. */
static void ET3201_setup_cdev(struct ET3201_dev *dev, int index)
{
int err, devno = MKDEV(ET3201_major, ET3201_minor + index);
cdev_init(&dev->cdev, &ET3201_fops);
dev->cdev.owner = THIS_MODULE;
dev->cdev.ops = &ET3201_fops;
dev->CAMAC_Module_Number = CAMAC_Nmod;
dev->CAMAC_Command_Adress = CAMAC_Adcom;
dev->Driver_Number = ET3201_minor + index;
err = cdev_add (&dev->cdev, devno, 1);
/* Fail gracefully if need be */
if (err)
printk(KERN_NOTICE "Error %d adding ET3201%d", err, index);
}
/*----------------------------------------------------------------------------*/
int __init ET3201_init(void)
{
int result = 0;
int i;
dev_t dev = 0;
BaseIO = Base;
/* Get a range of minor numbers to work with, asking for a dynamic
major unless directed otherwise at load time. */
if (ET3201_major) {
dev = MKDEV(ET3201_major, ET3201_minor);
result = register_chrdev_region(dev, ET3201_nr_devs, "ET3201");
} else {
result = alloc_chrdev_region(&dev, ET3201_minor, ET3201_nr_devs, "ET3201");
ET3201_major = MAJOR(dev);
}
if (result < 0) {
printk(KERN_WARNING "ET3201: can't get major %d\n", ET3201_major);
return result;
}
port = request_region(BaseIO, 8, "ET3201");
if ( port == NULL ) {
printk(KERN_WARNING "ET3201 cannot reserve i-o ports %lu \n", BaseIO);
return -ENODEV;
goto fail;
}
/*
* allocate the devices -- we can't have them static, as the number
* can be specified at load time
*/
ET3201_devices = kmalloc(ET3201_nr_devs * sizeof(struct ET3201_dev), GFP_KERNEL);
if (! ET3201_devices) {
result = -ENOMEM;
printk(KERN_ALERT "ET3201: can't get memory \n");
goto fail; /* Fail gracefully if need be */
}
memset(ET3201_devices, 0, ET3201_nr_devs * sizeof(struct ET3201_dev));
/* Initialize each device. */
for (i = 0; i < ET3201_nr_devs; i++) {
ET3201_devices[i].quantum = ET3201_quantum;
ET3201_devices[i].qset = ET3201_qset;
init_MUTEX(&ET3201_devices[i].sem);
ET3201_setup_cdev(&ET3201_devices[i], i);
}
/* At this point call the init function for any friend device */
dev = MKDEV(ET3201_major, ET3201_minor + ET3201_nr_devs);
/*dev += ET3201_access_init(dev);*/
printk(KERN_INFO "ET3201 is initialized with major %d\n", ET3201_major);
if ( port != NULL ){
printk(KERN_INFO "ET3201 is trying to reset %d devices\n", ET3201_nr_devs);
result = Reset_Port();
}
if ( result != 0 ) {
printk(KERN_ALERT "ET3201: device cannot reset with result %d\n", result);
result = -EFAULT;
goto fail;
}
#ifdef ET3201_DEBUG /* only when debugging */
ET3201_create_proc();
#endif
return 0; /* succeed */
fail:
ET3201_exit();
return result;
}
/*----------------------------------------------------------------------------*/
module_init(ET3201_init);
module_exit(ET3201_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(ET3201_minor);
接下来是 Reset_Port()
static int Reset_Port(void)
{
int result = -EIO;
int count;
if (port == NULL) goto fail;
for ( count = 0; count < ET3201_nr_devs; count++ )
{
outb(0x00, ports[count]);
}
wmb(); /*write memory barrier*/
LastOp = E_Reset;
result = 0; /* success */
fail:
return result;
}
EXPORT_SYMBOL(Reset_Port);
现在,在修复 'int Reset_Port(void)' 之后我遇到了另一个问题 -
'WARNING: modpost: Found 1 section mismatch(es).'
调试后我看到这是调用 'ET3201_exit()' 的结果
来自 'module_init()' - 当我评论这个电话时,警告消失了。
令人惊讶的是,在受人尊敬的作者的 "scull" 驱动程序中进行了完全相同的调用 - 而且它有效。
问题:什么会导致此代码中的内核不匹配?
是的!该错误已修复 - 在声明“int Reset_Port(void)”后,模块已成功插入和删除。我想,(但这是错误的)所有可以从“module_init()”中调用的函数都不能声明为静态的。
我正在为自定义设备开发此模块,实际上,这是一个连接到 ISA 总线的 4*8 位 i-o 端口,地址为 0x0120 - 0x0123。此驱动程序基于 Alessandro Rubini 和 Jonathan Corbet 的 "scull"。我的 OS 是 Ubuntu 10.04,内核是 2.6.32-74 generic,我使用内置的面向控制台的编译器 gcc。 使用 "insmod" 插入已编译模块时出现错误 "bad address" 并且未加载模块。我尝试使用 "printk" 调试它,发现我的模块成功获取了一系列 i-o 端口、主要和次要编号,然后,当尝试执行 "Reset_Port" 功能时,它会生成错误 "bad address" 并退出。
谁能告诉我,我做错了什么?
这是我模块的 __exit 和 __init 功能
void __exit ET3201_exit(void)
{
int i;
dev_t devno = MKDEV(ET3201_major, ET3201_minor);
/* Get rid of our char dev entries */
if (ET3201_devices) {
for (i = 0; i < ET3201_nr_devs; i++) {
ET3201_trim(ET3201_devices + i);
cdev_del(&ET3201_devices[i].cdev);
}
kfree(ET3201_devices);
}
#ifdef ET3201_DEBUG /* use proc only if debugging */
ET3201_remove_proc();
#endif
/* cleanup_module is never called if registering failed */
unregister_chrdev_region(devno, ET3201_nr_devs);
if ( ! port ) release_region(BaseIO, 8);
printk(KERN_INFO "Goodbye, cruel world - ET3201 is unloaded\n");
/* and call the cleanup functions for friend devices */
/*ET3201_access_cleanup();*/
}
/*----------------------------------------------------------------------------*/
/* Set up the char_dev structure for this device. */
static void ET3201_setup_cdev(struct ET3201_dev *dev, int index)
{
int err, devno = MKDEV(ET3201_major, ET3201_minor + index);
cdev_init(&dev->cdev, &ET3201_fops);
dev->cdev.owner = THIS_MODULE;
dev->cdev.ops = &ET3201_fops;
dev->CAMAC_Module_Number = CAMAC_Nmod;
dev->CAMAC_Command_Adress = CAMAC_Adcom;
dev->Driver_Number = ET3201_minor + index;
err = cdev_add (&dev->cdev, devno, 1);
/* Fail gracefully if need be */
if (err)
printk(KERN_NOTICE "Error %d adding ET3201%d", err, index);
}
/*----------------------------------------------------------------------------*/
int __init ET3201_init(void)
{
int result = 0;
int i;
dev_t dev = 0;
BaseIO = Base;
/* Get a range of minor numbers to work with, asking for a dynamic
major unless directed otherwise at load time. */
if (ET3201_major) {
dev = MKDEV(ET3201_major, ET3201_minor);
result = register_chrdev_region(dev, ET3201_nr_devs, "ET3201");
} else {
result = alloc_chrdev_region(&dev, ET3201_minor, ET3201_nr_devs, "ET3201");
ET3201_major = MAJOR(dev);
}
if (result < 0) {
printk(KERN_WARNING "ET3201: can't get major %d\n", ET3201_major);
return result;
}
port = request_region(BaseIO, 8, "ET3201");
if ( port == NULL ) {
printk(KERN_WARNING "ET3201 cannot reserve i-o ports %lu \n", BaseIO);
return -ENODEV;
goto fail;
}
/*
* allocate the devices -- we can't have them static, as the number
* can be specified at load time
*/
ET3201_devices = kmalloc(ET3201_nr_devs * sizeof(struct ET3201_dev), GFP_KERNEL);
if (! ET3201_devices) {
result = -ENOMEM;
printk(KERN_ALERT "ET3201: can't get memory \n");
goto fail; /* Fail gracefully if need be */
}
memset(ET3201_devices, 0, ET3201_nr_devs * sizeof(struct ET3201_dev));
/* Initialize each device. */
for (i = 0; i < ET3201_nr_devs; i++) {
ET3201_devices[i].quantum = ET3201_quantum;
ET3201_devices[i].qset = ET3201_qset;
init_MUTEX(&ET3201_devices[i].sem);
ET3201_setup_cdev(&ET3201_devices[i], i);
}
/* At this point call the init function for any friend device */
dev = MKDEV(ET3201_major, ET3201_minor + ET3201_nr_devs);
/*dev += ET3201_access_init(dev);*/
printk(KERN_INFO "ET3201 is initialized with major %d\n", ET3201_major);
if ( port != NULL ){
printk(KERN_INFO "ET3201 is trying to reset %d devices\n", ET3201_nr_devs);
result = Reset_Port();
}
if ( result != 0 ) {
printk(KERN_ALERT "ET3201: device cannot reset with result %d\n", result);
result = -EFAULT;
goto fail;
}
#ifdef ET3201_DEBUG /* only when debugging */
ET3201_create_proc();
#endif
return 0; /* succeed */
fail:
ET3201_exit();
return result;
}
/*----------------------------------------------------------------------------*/
module_init(ET3201_init);
module_exit(ET3201_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(ET3201_minor);
接下来是 Reset_Port()
static int Reset_Port(void)
{
int result = -EIO;
int count;
if (port == NULL) goto fail;
for ( count = 0; count < ET3201_nr_devs; count++ )
{
outb(0x00, ports[count]);
}
wmb(); /*write memory barrier*/
LastOp = E_Reset;
result = 0; /* success */
fail:
return result;
}
EXPORT_SYMBOL(Reset_Port);
现在,在修复 'int Reset_Port(void)' 之后我遇到了另一个问题 -
'WARNING: modpost: Found 1 section mismatch(es).'
调试后我看到这是调用 'ET3201_exit()' 的结果
来自 'module_init()' - 当我评论这个电话时,警告消失了。
令人惊讶的是,在受人尊敬的作者的 "scull" 驱动程序中进行了完全相同的调用 - 而且它有效。
问题:什么会导致此代码中的内核不匹配?
是的!该错误已修复 - 在声明“int Reset_Port(void)”后,模块已成功插入和删除。我想,(但这是错误的)所有可以从“module_init()”中调用的函数都不能声明为静态的。