115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <asm/pgtable.h>
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static int ptdump_show(struct seq_file *m, void *v)
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{
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ptdump_walk_pgd_level_debugfs(m, NULL, false);
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return 0;
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}
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static int ptdump_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, ptdump_show, NULL);
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}
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static const struct file_operations ptdump_fops = {
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.owner = THIS_MODULE,
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.open = ptdump_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int ptdump_show_curknl(struct seq_file *m, void *v)
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{
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if (current->mm->pgd) {
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down_read(¤t->mm->mmap_sem);
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ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, false);
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up_read(¤t->mm->mmap_sem);
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}
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return 0;
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}
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static int ptdump_open_curknl(struct inode *inode, struct file *filp)
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{
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return single_open(filp, ptdump_show_curknl, NULL);
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}
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static const struct file_operations ptdump_curknl_fops = {
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.owner = THIS_MODULE,
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.open = ptdump_open_curknl,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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static struct dentry *pe_curusr;
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static int ptdump_show_curusr(struct seq_file *m, void *v)
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{
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if (current->mm->pgd) {
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down_read(¤t->mm->mmap_sem);
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ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, true);
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up_read(¤t->mm->mmap_sem);
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}
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return 0;
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}
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static int ptdump_open_curusr(struct inode *inode, struct file *filp)
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{
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return single_open(filp, ptdump_show_curusr, NULL);
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}
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static const struct file_operations ptdump_curusr_fops = {
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.owner = THIS_MODULE,
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.open = ptdump_open_curusr,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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static struct dentry *dir, *pe_knl, *pe_curknl;
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static int __init pt_dump_debug_init(void)
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{
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dir = debugfs_create_dir("page_tables", NULL);
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if (!dir)
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return -ENOMEM;
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pe_knl = debugfs_create_file("kernel", 0400, dir, NULL,
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&ptdump_fops);
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if (!pe_knl)
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goto err;
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pe_curknl = debugfs_create_file("current_kernel", 0400,
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dir, NULL, &ptdump_curknl_fops);
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if (!pe_curknl)
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goto err;
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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pe_curusr = debugfs_create_file("current_user", 0400,
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dir, NULL, &ptdump_curusr_fops);
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if (!pe_curusr)
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goto err;
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#endif
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return 0;
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err:
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debugfs_remove_recursive(dir);
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return -ENOMEM;
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}
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static void __exit pt_dump_debug_exit(void)
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{
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debugfs_remove_recursive(dir);
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}
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module_init(pt_dump_debug_init);
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module_exit(pt_dump_debug_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
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MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");
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