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kaslr.c
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kaslr.c
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/*
* Procedures for exposing kaslr debugging information.
*
* Jia Ma, Samsung Research America, Sep 2015
* Copyright (C) 2015 Jia Ma.
*
* 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.
*/
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#if defined(CONFIG_DEBUG_FS)
static int kaslr_debug_show(struct seq_file *m, void *private)
{
#define TEXT_OFFSET 0x80000
u64 const kernel_offset = kimage_vaddr - KIMAGE_VADDR;
u64 kernel_addr = SZ_2G + TEXT_OFFSET + kernel_offset;
seq_printf(m, "0x%016llx..0x%016llx..\n",
kernel_addr, kernel_offset);
return 0;
}
static int kaslr_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, kaslr_debug_show, inode->i_private);
}
static const struct file_operations kaslr_debug_fops = {
.open = kaslr_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init kaslr_init_debugfs(void)
{
struct dentry *root = debugfs_create_dir("kaslr", NULL);
if (!root)
return -ENXIO;
debugfs_create_file("kaslr", 0400, root, NULL, &kaslr_debug_fops);
return 0;
}
device_initcall(kaslr_init_debugfs);
#endif /*CONFIG_DEBUG_FS*/