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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef __ASM_CSKY_UACCESS_H
#define __ASM_CSKY_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/version.h>
#include <asm/segment.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
static inline int access_ok(int type, const void *addr, unsigned long size)
{
unsigned long limit = current_thread_info()->addr_limit.seg;
return (((unsigned long)addr < limit) &&
((unsigned long)(addr + size) < limit));
}
static inline int verify_area(int type, const void *addr, unsigned long size)
{
return access_ok(type, addr, size) ? 0 : -EFAULT;
}
#define __addr_ok(addr) (access_ok(VERIFY_READ, addr, 0))
extern int __put_user_bad(void);
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the ugliness from the user.
*
* The "__xxx" versions of the user access functions are versions that
* do not verify the address space, that must have been done previously
* with a separate "access_ok()" call (this is used when we do multiple
* accesses to the same area of user memory).
*
* As we use the same address space for kernel and user data on
* Ckcore, we can just do these as direct assignments. (Of course, the
* exception handling means that it's no longer "just"...)
*/
#define put_user(x, ptr) \
__put_user_check((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
__put_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __ptr(x) ((unsigned long *)(x))
#define get_user(x, ptr) \
__get_user_check((x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err = 0; \
typeof(*(ptr)) *__pu_addr = (ptr); \
typeof(*(ptr)) __pu_val = (typeof(*(ptr)))(x); \
if (__pu_addr) \
__put_user_size(__pu_val, (__pu_addr), (size), \
__pu_err); \
__pu_err; \
})
#define __put_user_check(x, ptr, size) \
({ \
long __pu_err = -EFAULT; \
typeof(*(ptr)) *__pu_addr = (ptr); \
typeof(*(ptr)) __pu_val = (typeof(*(ptr)))(x); \
if (access_ok(VERIFY_WRITE, __pu_addr, size) && __pu_addr) \
__put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
__pu_err; \
})
#define __put_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
switch (size) { \
case 1: \
__put_user_asm_b(x, ptr, retval); \
break; \
case 2: \
__put_user_asm_h(x, ptr, retval); \
break; \
case 4: \
__put_user_asm_w(x, ptr, retval); \
break; \
case 8: \
__put_user_asm_64(x, ptr, retval); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
/*
* We don't tell gcc that we are accessing memory, but this is OK
* because we do not write to any memory gcc knows about, so there
* are no aliasing issues.
*
* Note that PC at a fault is the address *after* the faulting
* instruction.
*/
#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; \
typeof(*(ptr))src = (typeof(*(ptr)))x; \
typeof(*(ptr))*psrc = &src; \
\
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"(psrc), "=r"(ptr), \
"=r"(tmp), "=r"(errcode) \
: "0"(err), "1"(psrc), "2"(ptr), "3"(0), "4"(-EFAULT) \
: "memory"); \
} while (0)
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err; \
__get_user_size(x, (ptr), (size), __gu_err); \
__gu_err; \
})
#define __get_user_check(x, ptr, size) \
({ \
int __gu_err = -EFAULT; \
const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
if (access_ok(VERIFY_READ, __gu_ptr, size) && __gu_ptr) \
__get_user_size(x, __gu_ptr, size, __gu_err); \
__gu_err; \
})
#define __get_user_size(x, ptr, size, retval) \
do { \
switch (size) { \
case 1: \
__get_user_asm_common((x), ptr, "ldb", retval); \
break; \
case 2: \
__get_user_asm_common((x), ptr, "ldh", retval); \
break; \
case 4: \
__get_user_asm_common((x), ptr, "ldw", retval); \
break; \
default: \
x = 0; \
(retval) = __get_user_bad(); \
} \
} while (0)
#define __get_user_asm_common(x, ptr, ins, err) \
do { \
int errcode; \
asm volatile( \
"1: " ins " %1, (%4,0) \n" \
" br 3f \n" \
/* Fix up codes */ \
"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)
extern int __get_user_bad(void);
#define __copy_user(to, from, n) \
do { \
int w0, w1, w2, w3; \
asm volatile( \
"0: cmpnei %1, 0 \n" \
" bf 8f \n" \
" mov %3, %1 \n" \
" or %3, %2 \n" \
" andi %3, 3 \n" \
" cmpnei %3, 0 \n" \
" bf 1f \n" \
" br 5f \n" \
"1: cmplti %0, 16 \n" /* 4W */ \
" bt 3f \n" \
" ldw %3, (%2, 0) \n" \
" ldw %4, (%2, 4) \n" \
" ldw %5, (%2, 8) \n" \
" ldw %6, (%2, 12) \n" \
"2: stw %3, (%1, 0) \n" \
"9: stw %4, (%1, 4) \n" \
"10: stw %5, (%1, 8) \n" \
"11: stw %6, (%1, 12) \n" \
" addi %2, 16 \n" \
" addi %1, 16 \n" \
" subi %0, 16 \n" \
" br 1b \n" \
"3: cmplti %0, 4 \n" /* 1W */ \
" bt 5f \n" \
" ldw %3, (%2, 0) \n" \
"4: stw %3, (%1, 0) \n" \
" addi %2, 4 \n" \
" addi %1, 4 \n" \
" subi %0, 4 \n" \
" br 3b \n" \
"5: cmpnei %0, 0 \n" /* 1B */ \
" bf 8f \n" \
" ldb %3, (%2, 0) \n" \
"6: stb %3, (%1, 0) \n" \
" addi %2, 1 \n" \
" addi %1, 1 \n" \
" subi %0, 1 \n" \
" br 5b \n" \
"7: br 8f \n" \
".section __ex_table, \"a\" \n" \
".align 2 \n" \
".long 2b, 7b \n" \
".long 9b, 7b \n" \
".long 10b, 7b \n" \
".long 11b, 7b \n" \
".long 4b, 7b \n" \
".long 6b, 7b \n" \
".previous \n" \
"8: \n" \
: "=r"(n), "=r"(to), "=r"(from), "=r"(w0), \
"=r"(w1), "=r"(w2), "=r"(w3) \
: "0"(n), "1"(to), "2"(from) \
: "memory"); \
} while (0)
#define __copy_user_zeroing(to, from, n) \
do { \
int tmp; \
int nsave; \
asm volatile( \
"0: cmpnei %1, 0 \n" \
" bf 7f \n" \
" mov %3, %1 \n" \
" or %3, %2 \n" \
" andi %3, 3 \n" \
" cmpnei %3, 0 \n" \
" bf 1f \n" \
" br 5f \n" \
"1: cmplti %0, 16 \n" \
" bt 3f \n" \
"2: ldw %3, (%2, 0) \n" \
"10: ldw %4, (%2, 4) \n" \
" stw %3, (%1, 0) \n" \
" stw %4, (%1, 4) \n" \
"11: ldw %3, (%2, 8) \n" \
"12: ldw %4, (%2, 12) \n" \
" stw %3, (%1, 8) \n" \
" stw %4, (%1, 12) \n" \
" addi %2, 16 \n" \
" addi %1, 16 \n" \
" subi %0, 16 \n" \
" br 1b \n" \
"3: cmplti %0, 4 \n" \
" bt 5f \n" \
"4: ldw %3, (%2, 0) \n" \
" stw %3, (%1, 0) \n" \
" addi %2, 4 \n" \
" addi %1, 4 \n" \
" subi %0, 4 \n" \
" br 3b \n" \
"5: cmpnei %0, 0 \n" \
" bf 7f \n" \
"6: ldb %3, (%2, 0) \n" \
" stb %3, (%1, 0) \n" \
" addi %2, 1 \n" \
" addi %1, 1 \n" \
" subi %0, 1 \n" \
" br 5b \n" \
"8: mov %3, %0 \n" \
" movi %4, 0 \n" \
"9: stb %4, (%1, 0) \n" \
" addi %1, 1 \n" \
" subi %3, 1 \n" \
" cmpnei %3, 0 \n" \
" bt 9b \n" \
" br 7f \n" \
".section __ex_table, \"a\" \n" \
".align 2 \n" \
".long 2b, 8b \n" \
".long 10b, 8b \n" \
".long 11b, 8b \n" \
".long 12b, 8b \n" \
".long 4b, 8b \n" \
".long 6b, 8b \n" \
".previous \n" \
"7: \n" \
: "=r"(n), "=r"(to), "=r"(from), "=r"(nsave), \
"=r"(tmp) \
: "0"(n), "1"(to), "2"(from) \
: "memory"); \
} while (0)
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 *to, unsigned long n);
unsigned long __clear_user(void __user *to, unsigned long n);
long strncpy_from_user(char *dst, const char *src, long count);
long __strncpy_from_user(char *dst, const char *src, long count);
/*
* Return the size of a string (including the ending 0)
*
* Return 0 on exception, a value greater than N if too long
*/
long strnlen_user(const char *src, long n);
#define strlen_user(str) strnlen_user(str, 32767)
struct exception_table_entry {
unsigned long insn;
unsigned long nextinsn;
};
extern int fixup_exception(struct pt_regs *regs);
#endif /* __ASM_CSKY_UACCESS_H */
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