1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* termios.h: generic termios/termio user copying/translation
3 */
4
5 #ifndef _ASM_GENERIC_TERMIOS_BASE_H
6 #define _ASM_GENERIC_TERMIOS_BASE_H
7
8 #include <linux/uaccess.h>
9
10 #ifndef __ARCH_TERMIO_GETPUT
11
12 /*
13 * Translate a "termio" structure into a "termios". Ugh.
14 */
user_termio_to_kernel_termios(struct ktermios * termios,struct termio __user * termio)15 static inline int user_termio_to_kernel_termios(struct ktermios *termios,
16 struct termio __user *termio)
17 {
18 unsigned short tmp;
19
20 if (get_user(tmp, &termio->c_iflag) < 0)
21 goto fault;
22 termios->c_iflag = (0xffff0000 & termios->c_iflag) | tmp;
23
24 if (get_user(tmp, &termio->c_oflag) < 0)
25 goto fault;
26 termios->c_oflag = (0xffff0000 & termios->c_oflag) | tmp;
27
28 if (get_user(tmp, &termio->c_cflag) < 0)
29 goto fault;
30 termios->c_cflag = (0xffff0000 & termios->c_cflag) | tmp;
31
32 if (get_user(tmp, &termio->c_lflag) < 0)
33 goto fault;
34 termios->c_lflag = (0xffff0000 & termios->c_lflag) | tmp;
35
36 if (get_user(termios->c_line, &termio->c_line) < 0)
37 goto fault;
38
39 if (copy_from_user(termios->c_cc, termio->c_cc, NCC) != 0)
40 goto fault;
41
42 return 0;
43
44 fault:
45 return -EFAULT;
46 }
47
48 /*
49 * Translate a "termios" structure into a "termio". Ugh.
50 */
kernel_termios_to_user_termio(struct termio __user * termio,struct ktermios * termios)51 static inline int kernel_termios_to_user_termio(struct termio __user *termio,
52 struct ktermios *termios)
53 {
54 if (put_user(termios->c_iflag, &termio->c_iflag) < 0 ||
55 put_user(termios->c_oflag, &termio->c_oflag) < 0 ||
56 put_user(termios->c_cflag, &termio->c_cflag) < 0 ||
57 put_user(termios->c_lflag, &termio->c_lflag) < 0 ||
58 put_user(termios->c_line, &termio->c_line) < 0 ||
59 copy_to_user(termio->c_cc, termios->c_cc, NCC) != 0)
60 return -EFAULT;
61
62 return 0;
63 }
64
65 #ifndef user_termios_to_kernel_termios
66 #define user_termios_to_kernel_termios(k, u) copy_from_user(k, u, sizeof(struct termios))
67 #endif
68
69 #ifndef kernel_termios_to_user_termios
70 #define kernel_termios_to_user_termios(u, k) copy_to_user(u, k, sizeof(struct termios))
71 #endif
72
73 #define user_termios_to_kernel_termios_1(k, u) copy_from_user(k, u, sizeof(struct termios))
74 #define kernel_termios_to_user_termios_1(u, k) copy_to_user(u, k, sizeof(struct termios))
75
76 #endif /* __ARCH_TERMIO_GETPUT */
77
78 #endif /* _ASM_GENERIC_TERMIOS_BASE_H */
79