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 */