1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_GENERIC_TERMIOS_H
3#define _ASM_GENERIC_TERMIOS_H
4
5
6#include <linux/uaccess.h>
7#include <uapi/asm-generic/termios.h>
8
9/* intr=^C quit=^\ erase=del kill=^U
10 eof=^D vtime=\0 vmin=\1 sxtc=\0
11 start=^Q stop=^S susp=^Z eol=\0
12 reprint=^R discard=^U werase=^W lnext=^V
13 eol2=\0
14*/
15#define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0"
16
17/*
18 * Translate a "termio" structure into a "termios". Ugh.
19 */
20static inline int user_termio_to_kernel_termios(struct ktermios *termios,
21 const struct termio __user *termio)
22{
23 unsigned short tmp;
24
25 if (get_user(tmp, &termio->c_iflag) < 0)
26 goto fault;
27 termios->c_iflag = (0xffff0000 & termios->c_iflag) | tmp;
28
29 if (get_user(tmp, &termio->c_oflag) < 0)
30 goto fault;
31 termios->c_oflag = (0xffff0000 & termios->c_oflag) | tmp;
32
33 if (get_user(tmp, &termio->c_cflag) < 0)
34 goto fault;
35 termios->c_cflag = (0xffff0000 & termios->c_cflag) | tmp;
36
37 if (get_user(tmp, &termio->c_lflag) < 0)
38 goto fault;
39 termios->c_lflag = (0xffff0000 & termios->c_lflag) | tmp;
40
41 if (get_user(termios->c_line, &termio->c_line) < 0)
42 goto fault;
43
44 if (copy_from_user(termios->c_cc, termio->c_cc, NCC) != 0)
45 goto fault;
46
47 return 0;
48
49 fault:
50 return -EFAULT;
51}
52
53/*
54 * Translate a "termios" structure into a "termio". Ugh.
55 */
56static inline int kernel_termios_to_user_termio(struct termio __user *termio,
57 struct ktermios *termios)
58{
59 if (put_user(termios->c_iflag, &termio->c_iflag) < 0 ||
60 put_user(termios->c_oflag, &termio->c_oflag) < 0 ||
61 put_user(termios->c_cflag, &termio->c_cflag) < 0 ||
62 put_user(termios->c_lflag, &termio->c_lflag) < 0 ||
63 put_user(termios->c_line, &termio->c_line) < 0 ||
64 copy_to_user(termio->c_cc, termios->c_cc, NCC) != 0)
65 return -EFAULT;
66
67 return 0;
68}
69
70#ifdef TCGETS2
71static inline int user_termios_to_kernel_termios(struct ktermios *k,
72 struct termios2 __user *u)
73{
74 return copy_from_user(k, u, sizeof(struct termios2));
75}
76
77static inline int kernel_termios_to_user_termios(struct termios2 __user *u,
78 struct ktermios *k)
79{
80 return copy_to_user(u, k, sizeof(struct termios2));
81}
82
83static inline int user_termios_to_kernel_termios_1(struct ktermios *k,
84 struct termios __user *u)
85{
86 return copy_from_user(k, u, sizeof(struct termios));
87}
88
89static inline int kernel_termios_to_user_termios_1(struct termios __user *u,
90 struct ktermios *k)
91{
92 return copy_to_user(u, k, sizeof(struct termios));
93}
94#else /* TCGETS2 */
95static inline int user_termios_to_kernel_termios(struct ktermios *k,
96 struct termios __user *u)
97{
98 return copy_from_user(k, u, sizeof(struct termios));
99}
100
101static inline int kernel_termios_to_user_termios(struct termios __user *u,
102 struct ktermios *k)
103{
104 return copy_to_user(u, k, sizeof(struct termios));
105}
106#endif /* TCGETS2 */
107
108#endif /* _ASM_GENERIC_TERMIOS_H */
109