android13/external/ltp/testcases/kdump/lib/crasher/crasher.c

131 lines
3.2 KiB
C

/*
* Crasher module for kdump testing
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright © IBM Corporation 2007
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/version.h>
#include <linux/uaccess.h>
MODULE_LICENSE("GPL");
int crasher_init(void);
void crasher_exit(void);
module_init(crasher_init);
module_exit(crasher_exit);
#define CRASH "crasher" /* name of /proc entry file */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
static int crasher_read(char *buf, char **start, off_t offset, int len,
int *eof, void *data)
#else
static ssize_t crasher_read(struct file *file, char __user *buf, size_t len,
loff_t *offset)
#endif
{
return (sprintf(buf, "\n"));
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
static int crasher_write(struct file *file, const char *buffer,
unsigned long count, void *data)
#else
static ssize_t crasher_write(struct file *file, const char __user *buffer,
size_t count, loff_t *data)
#endif
{
char value, *a;
DEFINE_SPINLOCK(mylock);
/* grab the first byte the user gave us, ignore the rest */
if (copy_from_user(&value, buffer, 1))
return -EFAULT;
switch (value) {
case '0': /* panic the system */
panic("KDUMP test panic\n");
break;
case '1': /* BUG() test */
BUG();
break;
case '2': /* panic_on_oops test */
a = 0;
a[1] = 'A';
break;
case '3': /* hang w/double spinlock */
spin_lock_irq(&mylock);
spin_lock_irq(&mylock);
break;
default:
printk("crasher: Bad command\n");
}
return count; /* tell the user we read all his data,
somtimes white lies are ok */
}
/* create a directory in /proc and a debug file in the new directory */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
static const struct file_operations crasher_proc_fops = {
.owner = THIS_MODULE,
.read = crasher_read,
.write = crasher_write,
};
#endif
int crasher_init(void)
{
struct proc_dir_entry *crasher_proc;
printk("loaded crasher module\n");
/* build a crasher file that can be set */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
if ((crasher_proc = create_proc_entry(CRASH, 0, NULL)) == NULL) {
return -ENOMEM;
}
crasher_proc->owner = THIS_MODULE
crasher_proc->read_proc = crasher_read;
crasher_proc->write_proc = crasher_write;
#else
crasher_proc = proc_create_data(CRASH, 0, NULL,
&crasher_proc_fops, NULL);
if (!crasher_proc)
return -ENOMEM;
#endif
return 0;
}
void crasher_exit(void)
{
remove_proc_entry(CRASH, NULL);
printk("removed crasher module\n");
}