293 lines
8 KiB
C
Executable file
293 lines
8 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2005-2017 Andes Technology Corporation
|
|
|
|
#ifndef _ASMANDES_UACCESS_H
|
|
#define _ASMANDES_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/memory.h>
|
|
#include <asm/types.h>
|
|
#include <linux/mm.h>
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
|
|
|
|
/*
|
|
* The exception table consists of pairs of addresses: the first is the
|
|
* address of an instruction that is allowed to fault, and the second is
|
|
* the address at which the program should continue. No registers are
|
|
* modified, so it is entirely up to the continuation code to figure out
|
|
* what to do.
|
|
*
|
|
* All the routines below use bits of fixup code that are out of line
|
|
* with the main instruction path. This means when everything is well,
|
|
* we don't even have to jump over them. Further, they do not intrude
|
|
* on our cache or tlb entries.
|
|
*/
|
|
|
|
struct exception_table_entry {
|
|
unsigned long insn, fixup;
|
|
};
|
|
|
|
extern int fixup_exception(struct pt_regs *regs);
|
|
|
|
#define KERNEL_DS ((mm_segment_t) { ~0UL })
|
|
#define USER_DS ((mm_segment_t) {TASK_SIZE - 1})
|
|
|
|
#define get_ds() (KERNEL_DS)
|
|
#define get_fs() (current_thread_info()->addr_limit)
|
|
#define user_addr_max get_fs
|
|
|
|
static inline void set_fs(mm_segment_t fs)
|
|
{
|
|
current_thread_info()->addr_limit = fs;
|
|
}
|
|
|
|
#define segment_eq(a, b) ((a) == (b))
|
|
|
|
#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))
|
|
|
|
#define access_ok(type, addr, size) \
|
|
__range_ok((unsigned long)addr, (unsigned long)size)
|
|
/*
|
|
* Single-value transfer routines. They automatically use the right
|
|
* size if we just have the right pointer type. Note that the functions
|
|
* which read from user space (*get_*) need to take care not to leak
|
|
* kernel data even if the calling code is buggy and fails to check
|
|
* the return value. This means zeroing out the destination variable
|
|
* or buffer on error. Normally this is done out of line by the
|
|
* fixup code, but there are a few places where it intrudes on the
|
|
* main code path. When we only write to user space, there is no
|
|
* problem.
|
|
*
|
|
* The "__xxx" versions of the user access functions do not verify the
|
|
* address space - it must have been done previously with a separate
|
|
* "access_ok()" call.
|
|
*
|
|
* The "xxx_error" versions set the third argument to EFAULT if an
|
|
* error occurs, and leave it unchanged on success. Note that these
|
|
* versions are void (ie, don't return a value as such).
|
|
*/
|
|
|
|
#define get_user __get_user \
|
|
|
|
#define __get_user(x, ptr) \
|
|
({ \
|
|
long __gu_err = 0; \
|
|
__get_user_check((x), (ptr), __gu_err); \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user_error(x, ptr, err) \
|
|
({ \
|
|
__get_user_check((x), (ptr), (err)); \
|
|
(void)0; \
|
|
})
|
|
|
|
#define __get_user_check(x, ptr, err) \
|
|
({ \
|
|
const __typeof__(*(ptr)) __user *__p = (ptr); \
|
|
might_fault(); \
|
|
if (access_ok(VERIFY_READ, __p, sizeof(*__p))) { \
|
|
__get_user_err((x), __p, (err)); \
|
|
} else { \
|
|
(x) = 0; (err) = -EFAULT; \
|
|
} \
|
|
})
|
|
|
|
#define __get_user_err(x, ptr, err) \
|
|
do { \
|
|
unsigned long __gu_val; \
|
|
__chk_user_ptr(ptr); \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: \
|
|
__get_user_asm("lbi", __gu_val, (ptr), (err)); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm("lhi", __gu_val, (ptr), (err)); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm("lwi", __gu_val, (ptr), (err)); \
|
|
break; \
|
|
case 8: \
|
|
__get_user_asm_dword(__gu_val, (ptr), (err)); \
|
|
break; \
|
|
default: \
|
|
BUILD_BUG(); \
|
|
break; \
|
|
} \
|
|
(x) = (__force __typeof__(*(ptr)))__gu_val; \
|
|
} while (0)
|
|
|
|
#define __get_user_asm(inst, x, addr, err) \
|
|
__asm__ __volatile__ ( \
|
|
"1: "inst" %1,[%2]\n" \
|
|
"2:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .align 2\n" \
|
|
"3: move %0, %3\n" \
|
|
" move %1, #0\n" \
|
|
" b 2b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 3\n" \
|
|
" .long 1b, 3b\n" \
|
|
" .previous" \
|
|
: "+r" (err), "=&r" (x) \
|
|
: "r" (addr), "i" (-EFAULT) \
|
|
: "cc")
|
|
|
|
#ifdef __NDS32_EB__
|
|
#define __gu_reg_oper0 "%H1"
|
|
#define __gu_reg_oper1 "%L1"
|
|
#else
|
|
#define __gu_reg_oper0 "%L1"
|
|
#define __gu_reg_oper1 "%H1"
|
|
#endif
|
|
|
|
#define __get_user_asm_dword(x, addr, err) \
|
|
__asm__ __volatile__ ( \
|
|
"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \
|
|
"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \
|
|
"3:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .align 2\n" \
|
|
"4: move %0, %3\n" \
|
|
" b 3b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 3\n" \
|
|
" .long 1b, 4b\n" \
|
|
" .long 2b, 4b\n" \
|
|
" .previous" \
|
|
: "+r"(err), "=&r"(x) \
|
|
: "r"(addr), "i"(-EFAULT) \
|
|
: "cc")
|
|
|
|
#define put_user __put_user \
|
|
|
|
#define __put_user(x, ptr) \
|
|
({ \
|
|
long __pu_err = 0; \
|
|
__put_user_err((x), (ptr), __pu_err); \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_error(x, ptr, err) \
|
|
({ \
|
|
__put_user_err((x), (ptr), (err)); \
|
|
(void)0; \
|
|
})
|
|
|
|
#define __put_user_check(x, ptr, err) \
|
|
({ \
|
|
__typeof__(*(ptr)) __user *__p = (ptr); \
|
|
might_fault(); \
|
|
if (access_ok(VERIFY_WRITE, __p, sizeof(*__p))) { \
|
|
__put_user_err((x), __p, (err)); \
|
|
} else { \
|
|
(err) = -EFAULT; \
|
|
} \
|
|
})
|
|
|
|
#define __put_user_err(x, ptr, err) \
|
|
do { \
|
|
__typeof__(*(ptr)) __pu_val = (x); \
|
|
__chk_user_ptr(ptr); \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: \
|
|
__put_user_asm("sbi", __pu_val, (ptr), (err)); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm("shi", __pu_val, (ptr), (err)); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm("swi", __pu_val, (ptr), (err)); \
|
|
break; \
|
|
case 8: \
|
|
__put_user_asm_dword(__pu_val, (ptr), (err)); \
|
|
break; \
|
|
default: \
|
|
BUILD_BUG(); \
|
|
break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __put_user_asm(inst, x, addr, err) \
|
|
__asm__ __volatile__ ( \
|
|
"1: "inst" %1,[%2]\n" \
|
|
"2:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .align 2\n" \
|
|
"3: move %0, %3\n" \
|
|
" b 2b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 3\n" \
|
|
" .long 1b, 3b\n" \
|
|
" .previous" \
|
|
: "+r" (err) \
|
|
: "r" (x), "r" (addr), "i" (-EFAULT) \
|
|
: "cc")
|
|
|
|
#ifdef __NDS32_EB__
|
|
#define __pu_reg_oper0 "%H2"
|
|
#define __pu_reg_oper1 "%L2"
|
|
#else
|
|
#define __pu_reg_oper0 "%L2"
|
|
#define __pu_reg_oper1 "%H2"
|
|
#endif
|
|
|
|
#define __put_user_asm_dword(x, addr, err) \
|
|
__asm__ __volatile__ ( \
|
|
"\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \
|
|
"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \
|
|
"3:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .align 2\n" \
|
|
"4: move %0, %3\n" \
|
|
" b 3b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 3\n" \
|
|
" .long 1b, 4b\n" \
|
|
" .long 2b, 4b\n" \
|
|
" .previous" \
|
|
: "+r"(err) \
|
|
: "r"(addr), "r"(x), "i"(-EFAULT) \
|
|
: "cc")
|
|
|
|
extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
|
|
extern long strncpy_from_user(char *dest, const char __user * src, long count);
|
|
extern __must_check long strlen_user(const char __user * str);
|
|
extern __must_check long strnlen_user(const char __user * str, long n);
|
|
extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
|
|
unsigned long n);
|
|
extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
|
|
unsigned long n);
|
|
|
|
#define raw_copy_from_user __arch_copy_from_user
|
|
#define raw_copy_to_user __arch_copy_to_user
|
|
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
static inline unsigned long clear_user(void __user * to, unsigned long n)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, to, n))
|
|
n = __arch_clear_user(to, n);
|
|
return n;
|
|
}
|
|
|
|
static inline unsigned long __clear_user(void __user * to, unsigned long n)
|
|
{
|
|
return __arch_clear_user(to, n);
|
|
}
|
|
|
|
#endif /* _ASMNDS32_UACCESS_H */
|