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/* SPDX-License-Identifier: GPL-2.0 */
/*
* S390 version
* Copyright IBM Corp. 1999, 2000
* Author(s): Hartmut Penner (hp@de.ibm.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Derived from "include/asm-i386/uaccess.h"
*/
#ifndef __S390_UACCESS_H
#define __S390_UACCESS_H
/*
* User space memory access functions
*/
#include <asm/asm-extable.h>
#include <asm/processor.h>
#include <asm/ctl_reg.h>
#include <asm/extable.h>
#include <asm/facility.h>
#include <asm-generic/access_ok.h>
void debug_user_asce(int exit);
unsigned long __must_check
raw_copy_from_user(void *to, const void __user *from, unsigned long n);
unsigned long __must_check
raw_copy_to_user(void __user *to, const void *from, unsigned long n);
#ifndef CONFIG_KASAN
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
#endif
unsigned long __must_check
_copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key);
static __always_inline unsigned long __must_check
copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key)
{
if (check_copy_size(to, n, false))
n = _copy_from_user_key(to, from, n, key);
return n;
}
unsigned long __must_check
_copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned long key);
static __always_inline unsigned long __must_check
copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned long key)
{
if (check_copy_size(from, n, true))
n = _copy_to_user_key(to, from, n, key);
return n;
}
union oac {
unsigned int val;
struct {
struct {
unsigned short key : 4;
unsigned short : 4;
unsigned short as : 2;
unsigned short : 4;
unsigned short k : 1;
unsigned short a : 1;
} oac1;
struct {
unsigned short key : 4;
unsigned short : 4;
unsigned short as : 2;
unsigned short : 4;
unsigned short k : 1;
unsigned short a : 1;
} oac2;
};
};
int __noreturn __put_user_bad(void);
#define __put_user_asm(to, from, size) \
({ \
union oac __oac_spec = { \
.oac1.as = PSW_BITS_AS_SECONDARY, \
.oac1.a = 1, \
}; \
int __rc; \
\
asm volatile( \
" lr 0,%[spec]\n" \
"0: mvcos %[_to],%[_from],%[_size]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
: [rc] "=&d" (__rc), [_to] "+Q" (*(to)) \
: [_size] "d" (size), [_from] "Q" (*(from)), \
[spec] "d" (__oac_spec.val) \
: "cc", "0"); \
__rc; \
})
static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
int rc;
switch (size) {
case 1:
rc = __put_user_asm((unsigned char __user *)ptr,
(unsigned char *)x,
size);
break;
case 2:
rc = __put_user_asm((unsigned short __user *)ptr,
(unsigned short *)x,
size);
break;
case 4:
rc = __put_user_asm((unsigned int __user *)ptr,
(unsigned int *)x,
size);
break;
case 8:
rc = __put_user_asm((unsigned long __user *)ptr,
(unsigned long *)x,
size);
break;
default:
__put_user_bad();
break;
}
return rc;
}
int __noreturn __get_user_bad(void);
#define __get_user_asm(to, from, size) \
({ \
union oac __oac_spec = { \
.oac2.as = PSW_BITS_AS_SECONDARY, \
.oac2.a = 1, \
}; \
int __rc; \
\
asm volatile( \
" lr 0,%[spec]\n" \
"0: mvcos 0(%[_to]),%[_from],%[_size]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
EX_TABLE_UA_LOAD_MEM(0b, 2b, %[rc], %[_to], %[_ksize]) \
EX_TABLE_UA_LOAD_MEM(1b, 2b, %[rc], %[_to], %[_ksize]) \
: [rc] "=&d" (__rc), "=Q" (*(to)) \
: [_size] "d" (size), [_from] "Q" (*(from)), \
[spec] "d" (__oac_spec.val), [_to] "a" (to), \
[_ksize] "K" (size) \
: "cc", "0"); \
__rc; \
})
static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
int rc;
switch (size) {
case 1:
rc = __get_user_asm((unsigned char *)x,
(unsigned char __user *)ptr,
size);
break;
case 2:
rc = __get_user_asm((unsigned short *)x,
(unsigned short __user *)ptr,
size);
break;
case 4:
rc = __get_user_asm((unsigned int *)x,
(unsigned int __user *)ptr,
size);
break;
case 8:
rc = __get_user_asm((unsigned long *)x,
(unsigned long __user *)ptr,
size);
break;
default:
__get_user_bad();
break;
}
return rc;
}
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __x = (x); \
int __pu_err = -EFAULT; \
\
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
case 8: \
__pu_err = __put_user_fn(&__x, ptr, sizeof(*(ptr))); \
break; \
default: \
__put_user_bad(); \
break; \
} \
__builtin_expect(__pu_err, 0); \
})
#define put_user(x, ptr) \
({ \
might_fault(); \
__put_user(x, ptr); \
})
#define __get_user(x, ptr) \
({ \
int __gu_err = -EFAULT; \
\
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: { \
unsigned char __x; \
\
__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *)&__x; \
break; \
}; \
case 2: { \
unsigned short __x; \
\
__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *)&__x; \
break; \
}; \
case 4: { \
unsigned int __x; \
\
__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *)&__x; \
break; \
}; \
case 8: { \
unsigned long __x; \
\
__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *)&__x; \
break; \
}; \
default: \
__get_user_bad(); \
break; \
} \
__builtin_expect(__gu_err, 0); \
})
#define get_user(x, ptr) \
({ \
might_fault(); \
__get_user(x, ptr); \
})
/*
* Copy a null terminated string from userspace.
*/
long __must_check strncpy_from_user(char *dst, const char __user *src, long count);
long __must_check strnlen_user(const char __user *src, long count);
/*
* Zero Userspace
*/
unsigned long __must_check __clear_user(void __user *to, unsigned long size);
static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
{
might_fault();
return __clear_user(to, n);
}
void *s390_kernel_write(void *dst, const void *src, size_t size);
int __noreturn __put_kernel_bad(void);
#define __put_kernel_asm(val, to, insn) \
({ \
int __rc; \
\
asm volatile( \
"0: " insn " %[_val],%[_to]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
: [rc] "=d" (__rc), [_to] "+Q" (*(to)) \
: [_val] "d" (val) \
: "cc"); \
__rc; \
})
#define __put_kernel_nofault(dst, src, type, err_label) \
do { \
unsigned long __x = (unsigned long)(*((type *)(src))); \
int __pk_err; \
\
switch (sizeof(type)) { \
case 1: \
__pk_err = __put_kernel_asm(__x, (type *)(dst), "stc"); \
break; \
case 2: \
__pk_err = __put_kernel_asm(__x, (type *)(dst), "sth"); \
break; \
case 4: \
__pk_err = __put_kernel_asm(__x, (type *)(dst), "st"); \
break; \
case 8: \
__pk_err = __put_kernel_asm(__x, (type *)(dst), "stg"); \
break; \
default: \
__pk_err = __put_kernel_bad(); \
break; \
} \
if (unlikely(__pk_err)) \
goto err_label; \
} while (0)
int __noreturn __get_kernel_bad(void);
#define __get_kernel_asm(val, from, insn) \
({ \
int __rc; \
\
asm volatile( \
"0: " insn " %[_val],%[_from]\n" \
"1: xr %[rc],%[rc]\n" \
"2:\n" \
EX_TABLE_UA_LOAD_REG(0b, 2b, %[rc], %[_val]) \
EX_TABLE_UA_LOAD_REG(1b, 2b, %[rc], %[_val]) \
: [rc] "=d" (__rc), [_val] "=d" (val) \
: [_from] "Q" (*(from)) \
: "cc"); \
__rc; \
})
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
int __gk_err; \
\
switch (sizeof(type)) { \
case 1: { \
unsigned char __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "ic"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
case 2: { \
unsigned short __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "lh"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
case 4: { \
unsigned int __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "l"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
case 8: { \
unsigned long __x; \
\
__gk_err = __get_kernel_asm(__x, (type *)(src), "lg"); \
*((type *)(dst)) = (type)__x; \
break; \
}; \
default: \
__gk_err = __get_kernel_bad(); \
break; \
} \
if (unlikely(__gk_err)) \
goto err_label; \
} while (0)
#endif /* __S390_UACCESS_H */
|
