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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_CSKY_UACCESS_H
#define __ASM_CSKY_UACCESS_H
#define user_addr_max() (current_thread_info()->addr_limit.seg)
static inline int __access_ok(unsigned long addr, unsigned long size)
{
unsigned long limit = user_addr_max();
return (size <= limit) && (addr <= (limit - size));
}
#define __access_ok __access_ok
/*
* __put_user_fn
*/
extern int __put_user_bad(void);
#define __put_user_asm_b(x, ptr, err) \
do { \
int errcode; \
__asm__ __volatile__( \
"1: stb %1, (%2,0) \n" \
" br 3f \n" \
"2: mov %0, %3 \n" \
" br 3f \n" \
".section __ex_table, \"a\" \n" \
".align 2 \n" \
".long 1b,2b \n" \
".previous \n" \
"3: \n" \
: "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \
: "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \
: "memory"); \
} while (0)
#define __put_user_asm_h(x, ptr, err) \
do { \
int errcode; \
__asm__ __volatile__( \
"1: sth %1, (%2,0) \n" \
" br 3f \n" \
"2: mov %0, %3 \n" \
" br 3f \n" \
".section __ex_table, \"a\" \n" \
".align 2 \n" \
".long 1b,2b \n" \
".previous \n" \
"3: \n" \
: "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \
: "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \
: "memory"); \
} while (0)
#define __put_user_asm_w(x, ptr, err) \
do { \
int errcode; \
__asm__ __volatile__( \
"1: stw %1, (%2,0) \n" \
" br 3f \n" \
"2: mov %0, %3 \n" \
" br 3f \n" \
".section __ex_table,\"a\" \n" \
".align 2 \n" \
".long 1b, 2b \n" \
".previous \n" \
"3: \n" \
: "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \
: "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \
: "memory"); \
} while (0)
#define __put_user_asm_64(x, ptr, err) \
do { \
int tmp; \
int errcode; \
\
__asm__ __volatile__( \
" ldw %3, (%1, 0) \n" \
"1: stw %3, (%2, 0) \n" \
" ldw %3, (%1, 4) \n" \
"2: stw %3, (%2, 4) \n" \
" br 4f \n" \
"3: mov %0, %4 \n" \
" br 4f \n" \
".section __ex_table, \"a\" \n" \
".align 2 \n" \
".long 1b, 3b \n" \
".long 2b, 3b \n" \
".previous \n" \
"4: \n" \
: "=r"(err), "=r"(x), "=r"(ptr), \
"=r"(tmp), "=r"(errcode) \
: "0"(err), "1"(x), "2"(ptr), "3"(0), \
"4"(-EFAULT) \
: "memory"); \
} while (0)
static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
{
int retval = 0;
u32 tmp;
switch (size) {
case 1:
tmp = *(u8 *)x;
__put_user_asm_b(tmp, ptr, retval);
break;
case 2:
tmp = *(u16 *)x;
__put_user_asm_h(tmp, ptr, retval);
break;
case 4:
tmp = *(u32 *)x;
__put_user_asm_w(tmp, ptr, retval);
break;
case 8:
__put_user_asm_64(x, (u64 *)ptr, retval);
break;
}
return retval;
}
#define __put_user_fn __put_user_fn
/*
* __get_user_fn
*/
extern int __get_user_bad(void);
#define __get_user_asm_common(x, ptr, ins, err) \
do { \
int errcode; \
__asm__ __volatile__( \
"1: " ins " %1, (%4, 0) \n" \
" br 3f \n" \
"2: mov %0, %2 \n" \
" movi %1, 0 \n" \
" br 3f \n" \
".section __ex_table,\"a\" \n" \
".align 2 \n" \
".long 1b, 2b \n" \
".previous \n" \
"3: \n" \
: "=r"(err), "=r"(x), "=r"(errcode) \
: "0"(0), "r"(ptr), "2"(-EFAULT) \
: "memory"); \
} while (0)
#define __get_user_asm_64(x, ptr, err) \
do { \
int tmp; \
int errcode; \
\
__asm__ __volatile__( \
"1: ldw %3, (%2, 0) \n" \
" stw %3, (%1, 0) \n" \
"2: ldw %3, (%2, 4) \n" \
" stw %3, (%1, 4) \n" \
" br 4f \n" \
"3: mov %0, %4 \n" \
" br 4f \n" \
".section __ex_table, \"a\" \n" \
".align 2 \n" \
".long 1b, 3b \n" \
".long 2b, 3b \n" \
".previous \n" \
"4: \n" \
: "=r"(err), "=r"(x), "=r"(ptr), \
"=r"(tmp), "=r"(errcode) \
: "0"(err), "1"(x), "2"(ptr), "3"(0), \
"4"(-EFAULT) \
: "memory"); \
} while (0)
static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
{
int retval;
u32 tmp;
switch (size) {
case 1:
__get_user_asm_common(tmp, ptr, "ldb", retval);
*(u8 *)x = (u8)tmp;
break;
case 2:
__get_user_asm_common(tmp, ptr, "ldh", retval);
*(u16 *)x = (u16)tmp;
break;
case 4:
__get_user_asm_common(tmp, ptr, "ldw", retval);
*(u32 *)x = (u32)tmp;
break;
case 8:
__get_user_asm_64(x, ptr, retval);
break;
}
return retval;
}
#define __get_user_fn __get_user_fn
unsigned long raw_copy_from_user(void *to, const void *from, unsigned long n);
unsigned long raw_copy_to_user(void *to, const void *from, unsigned long n);
unsigned long __clear_user(void __user *to, unsigned long n);
#define __clear_user __clear_user
#include <asm/segment.h>
#include <asm-generic/uaccess.h>
#endif /* __ASM_CSKY_UACCESS_H */