s390/lib/uaccess.c

34 static unsigned long raw_copy_from_user_key(void *to, const void __user *from,
47 		"0:	mvcos	0(%[to]),0(%[from]),%[size]\n"
51 		"	slgr	%[to],%[val]\n"
58 		"3:	mvcos	0(%[to]),0(%[from]),%[rem]\n"
67 		: [size] "+&a" (size), [from] "+&a" (from), [to] "+&a" (to), [rem] "=&a" (rem)
73 unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
75 	return raw_copy_from_user_key(to, from, n, 0);
79 unsigned long _copy_from_user_key(void *to, const void __user *from,
86 		instrument_copy_from_user_before(to, from, n);
87 		res = raw_copy_from_user_key(to, from, n, key);
88 		instrument_copy_from_user_after(to, from, n, res);
91 		memset(to + (n - res), 0, res);
96 static unsigned long raw_copy_to_user_key(void __user *to, const void *from,
109 		"0:	mvcos	0(%[to]),0(%[from]),%[size]\n"
112 		"	slgr	%[to],%[val]\n"
115 		"2:	la	%[rem],4095(%[to])\n"	/* rem = to + 4095 */
116 		"	nr	%[rem],%[val]\n"	/* rem = (to + 4095) & -4096 */
117 		"	slgr	%[rem],%[to]\n"
120 		"3:	mvcos	0(%[to]),0(%[from]),%[rem]\n"
129 		: [size] "+&a" (size), [to] "+&a" (to), [from] "+&a" (from), [rem] "=&a" (rem)
135 unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
137 	return raw_copy_to_user_key(to, from, n, 0);
141 unsigned long _copy_to_user_key(void __user *to, const void *from,
147 	instrument_copy_to_user(to, from, n);
148 	return raw_copy_to_user_key(to, from, n, key);
152 unsigned long __clear_user(void __user *to, unsigned long size)
162 		"0:	mvcos	0(%[to]),0(%[zeropg]),%[size]\n"
165 		"	slgr	%[to],%[val]\n"
167 		"2:	la	%[rem],4095(%[to])\n"	/* rem = to + 4095 */
168 		"	nr	%[rem],%[val]\n"	/* rem = (to + 4095) & -4096 */
169 		"	slgr	%[rem],%[to]\n"
172 		"3:	mvcos	0(%[to]),0(%[zeropg]),%[rem]\n"
181 		: [size] "+&a" (size), [to] "+&a" (to), [rem] "=&a" (rem)