131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
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* Crasher module for kdump testing
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright © IBM Corporation 2007
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include <linux/version.h>
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#include <linux/uaccess.h>
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MODULE_LICENSE("GPL");
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int crasher_init(void);
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void crasher_exit(void);
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module_init(crasher_init);
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module_exit(crasher_exit);
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#define CRASH "crasher" /* name of /proc entry file */
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
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static int crasher_read(char *buf, char **start, off_t offset, int len,
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int *eof, void *data)
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#else
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static ssize_t crasher_read(struct file *file, char __user *buf, size_t len,
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loff_t *offset)
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#endif
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{
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return (sprintf(buf, "\n"));
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}
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
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static int crasher_write(struct file *file, const char *buffer,
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unsigned long count, void *data)
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#else
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static ssize_t crasher_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *data)
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#endif
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{
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char value, *a;
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DEFINE_SPINLOCK(mylock);
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/* grab the first byte the user gave us, ignore the rest */
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if (copy_from_user(&value, buffer, 1))
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return -EFAULT;
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switch (value) {
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case '0': /* panic the system */
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panic("KDUMP test panic\n");
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break;
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case '1': /* BUG() test */
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BUG();
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break;
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case '2': /* panic_on_oops test */
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a = 0;
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a[1] = 'A';
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break;
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case '3': /* hang w/double spinlock */
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spin_lock_irq(&mylock);
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spin_lock_irq(&mylock);
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break;
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default:
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printk("crasher: Bad command\n");
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}
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return count; /* tell the user we read all his data,
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somtimes white lies are ok */
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}
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/* create a directory in /proc and a debug file in the new directory */
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
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static const struct file_operations crasher_proc_fops = {
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.owner = THIS_MODULE,
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.read = crasher_read,
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.write = crasher_write,
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};
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#endif
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int crasher_init(void)
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{
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struct proc_dir_entry *crasher_proc;
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printk("loaded crasher module\n");
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/* build a crasher file that can be set */
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
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if ((crasher_proc = create_proc_entry(CRASH, 0, NULL)) == NULL) {
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return -ENOMEM;
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}
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crasher_proc->owner = THIS_MODULE
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crasher_proc->read_proc = crasher_read;
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crasher_proc->write_proc = crasher_write;
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#else
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crasher_proc = proc_create_data(CRASH, 0, NULL,
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&crasher_proc_fops, NULL);
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if (!crasher_proc)
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return -ENOMEM;
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#endif
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return 0;
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}
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void crasher_exit(void)
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{
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remove_proc_entry(CRASH, NULL);
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printk("removed crasher module\n");
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}
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