3 * modules/writer/kernel_operations.h
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Copyright (C) Samsung Electronics, 2013
21 * 2013 Alexander Aksenov <a.aksenov@samsung.com>: SWAP Writer implementation
25 /* Kernel functions wrap */
27 #ifndef __KERNEL_OPERATIONS_H__
28 #define __KERNEL_OPERATIONS_H__
30 #include <linux/kernel.h>
31 #include <asm/ptrace.h>
35 #define print_debug(msg, args...) \
36 printk(KERN_DEBUG "SWAP_WRITER DEBUG : " msg, ##args)
37 #define print_msg(msg, args...) \
38 printk(KERN_INFO "SWAP_WRITER : " msg, ##args)
39 #define print_warn(msg, args...) \
40 printk(KERN_WARNING "SWAP_WRITER WARNING : " msg, ##args)
41 #define print_err(msg, args...) \
42 printk(KERN_ERR "SWAP_WRITER ERROR : " msg, ##args)
43 #define print_crit(msg, args...) \
44 printk(KERN_CRIT "SWAP_WRITER CRITICAL : " msg, ##args)
46 /* ARCH-DEPENDED OPERATIONS */
49 /* Regs manipulations */
50 #if defined(CONFIG_ARM)
52 #define get_regs_ip(regs) regs->ARM_pc
53 #define get_regs_ret_func(regs) regs->ARM_lr
54 #define get_regs_ret_val(regs) regs->ARM_r0
55 #define get_regs_stack_ptr(regs) regs->ARM_sp
57 #elif defined(CONFIG_X86_32)
59 #define get_regs_ip(regs) regs->ip - 1
60 #define get_regs_ret_val(regs) regs->ax
61 #define get_regs_stack_ptr(regs) regs->sp
63 static inline u32 get_regs_ret_func(struct pt_regs *regs)
67 if (user_mode(regs)) {
69 if (get_user(addr, sp))
70 printk("failed to dereference a pointer, sp=%p, "
71 "pc=%lx\n", sp, get_regs_ip(regs));
73 sp = (u32 *)kernel_stack_pointer(regs);
80 #endif /* CONFIG_arch */
82 int get_args(unsigned long args[], int cnt, struct pt_regs *regs);
84 /* Returns shared kernel memory area name if it is found, otherwise - NULL */
85 const char *get_shared_kmem(struct mm_struct *mm, unsigned long *start,
88 #endif /* __KERNEL_OPERATIONS_H__ */