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/*
* Dynamic Binary Instrumentation Module based on KProbes
* modules/ks_manager/ks_manager.c
*
* 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 (C) Samsung Electronics, 2013
*
* 2013 Vyacheslav Cherkashin <v.cherkashin@samsung.com>
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <kprobe/swap_kprobes.h>
#include <kprobe/swap_kprobes_deps.h>
#include "ks_manager.h"
struct probe {
struct hlist_node hlist;
struct kern_probe p;
};
static HLIST_HEAD(list_probes);
static struct probe *create_probe(unsigned long addr, void *pre_handler,
void *jp_handler, void *rp_handler)
{
struct probe *p = kzalloc(sizeof(*p), GFP_KERNEL);
p->p.jp.kp.addr = p->p.rp.kp.addr = (void *)addr;
p->p.jp.pre_entry = pre_handler;
p->p.jp.entry = jp_handler;
p->p.rp.handler = rp_handler;
INIT_HLIST_NODE(&p->hlist);
return p;
}
static void free_probe(struct probe *p)
{
kfree(p);
}
static void add_probe_to_list(struct probe *p)
{
hlist_add_head(&p->hlist, &list_probes);
}
static void remove_probe_to_list(struct probe *p)
{
hlist_del(&p->hlist);
}
static struct probe *find_probe(unsigned long addr)
{
struct probe *p;
DECLARE_NODE_PTR_FOR_HLIST(node);
/* check if such probe does exist */
swap_hlist_for_each_entry(p, node, &list_probes, hlist)
if ((unsigned long)p->p.jp.kp.addr == addr)
return p;
return NULL;
}
int ksm_register_probe(unsigned long addr, void *pre_handler,
void *jp_handler, void *rp_handler)
{
int ret;
struct probe *p;
p = create_probe(addr, pre_handler, jp_handler, rp_handler);
if (!p)
return -ENOMEM;
ret = swap_register_jprobe(&p->p.jp);
if (ret)
goto free;
ret = swap_register_kretprobe(&p->p.rp);
if (ret)
goto unregister_jprobe;
add_probe_to_list(p);
return 0;
unregister_jprobe:
swap_unregister_jprobe(&p->p.jp);
free:
free_probe(p);
return ret;
}
EXPORT_SYMBOL_GPL(ksm_register_probe);
static void do_ksm_unregister_probe(struct probe *p)
{
remove_probe_to_list(p);
swap_unregister_kretprobe(&p->p.rp);
swap_unregister_jprobe(&p->p.jp);
free_probe(p);
}
int ksm_unregister_probe(unsigned long addr)
{
struct probe *p;
p = find_probe(addr);
if (p == NULL)
return -EINVAL;
do_ksm_unregister_probe(p);
return 0;
}
EXPORT_SYMBOL_GPL(ksm_unregister_probe);
int ksm_unregister_probe_all(void)
{
struct probe *p;
struct hlist_node *n;
DECLARE_NODE_PTR_FOR_HLIST(node);
swap_hlist_for_each_entry_safe(p, node, n, &list_probes, hlist) {
do_ksm_unregister_probe(p);
}
return 0;
}
EXPORT_SYMBOL_GPL(ksm_unregister_probe_all);
static int __init init_ks_manager(void)
{
return 0;
}
static void __exit exit_ks_manager(void)
{
ksm_unregister_probe_all();
}
module_init(init_ks_manager);
module_exit(exit_ks_manager);
MODULE_LICENSE ("GPL");
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