/* $Id: uaccess.h,v 1.9 2003/05/06 23:28:51 lethal Exp $
*
* User space memory access functions
*
* Copyright (C) 1999, 2002 Niibe Yutaka
* Copyright (C) 2003 Paul Mundt
*
* Based on:
* MIPS implementation version 1.15 by
* Copyright (C) 1996, 1997, 1998 by Ralf Baechle
* and i386 version.
*/
#ifndef __ASM_SH_UACCESS_H
#define __ASM_SH_UACCESS_H
#include <linux/errno.h>
#include <linux/sched.h>
/*
* NOTE: Macro/functions in this file depends on threads_info.h implementation.
* Assumes:
* TI_FLAGS == 8
* TIF_USERSPACE == 31
* USER_ADDR_LIMIT == 0x80000000
*/
#define VERIFY_READ 0
#define VERIFY_WRITE 1
typedef struct {
unsigned int is_user_space;
} mm_segment_t;
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons (Data Segment Register?), these macros are misnamed.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define segment_eq(a,b) ((a).is_user_space == (b).is_user_space)
#define USER_ADDR_LIMIT 0x80000000
#define KERNEL_DS MAKE_MM_SEG(0)
#define USER_DS MAKE_MM_SEG(1)
#define get_ds() (KERNEL_DS)
#if !defined(CONFIG_MMU)
static inline mm_segment_t get_fs(void)
{
return USER_DS;
}
static inline void set_fs(mm_segment_t s)
{
}
/*
* __access_ok: Check if address with size is OK or not.
*
* If we don't have an MMU (or if its disabled) the only thing we really have
* to look out for is if the address resides somewhere outside of what
* available RAM we have.
*
* TODO: This check could probably also stand to be restricted somewhat more..
* though it still does the Right Thing(tm) for the time being.
*/
static inline int __access_ok(unsigned long addr, unsigned long size)
{
extern unsigned long memory_start, memory_end;
return ((addr >= memory_start) && ((addr + size) < memory_end));
}
#else /* CONFIG_MMU */
static inline mm_segment_t get_fs(void)
{
return MAKE_MM_SEG(test_thread_flag(TIF_USERSPACE));
}
static inline void set_fs(mm_segment_t s)
{
unsigned long ti, flag;
__asm__ __volatile__(
"stc r7_bank, %0\n\t"
"mov.l @(8,%0), %1\n\t"
"shal %1\n\t"
"cmp/pl %2\n\t"
"rotcr %1\n\t"
"mov.l %1, @(8,%0)"
: "=&r" (ti), "=&r" (flag)
: "r" (s.is_user_space)
: "t");
/****
if (s.is_user_space)
set_thread_flag(TIF_USERSPACE);
else
clear_thread_flag(TIF_USERSPACE);
****/
}
/*
* __access_ok: Check if address with size is OK or not.
*
* We do three checks:
* (1) is it user space?
* (2) addr + size --> carry?
* (3) addr + size >= 0x80000000 (USER_ADDR_LIMIT)
*
* (1) (2) (3) | RESULT
* 0 0 0 | ok
* 0 0 1 | ok
* 0 1 0 | bad
* 0 1 1 | bad
* 1 0 0 | ok
* 1 0 1 | bad
* 1 1 0 | bad
* 1 1 1 | bad
*/
static inline int __access_ok(unsigned long addr, unsigned long size)
{
unsigned long flag, tmp;
__asm__("stc r7_bank, %0\n\t"
"mov.l @(8,%0), %0\n\t"
"clrt\n\t"
"addc %2, %1\n\t"
"and %1, %0\n\t"
"rotcl %0\n\t"
"rotcl %0\n\t"
"and #3, %0"
: "=&z" (flag), "=r" (tmp)
: "r" (addr), "1" (size)
: "t");
return flag == 0;
}
#endif /* CONFIG_MMU */
static inline int access_ok(int type, const void *p, unsigned long size)
{
unsigned long addr = (unsigned long)p;
return __access_ok(addr, size);
}
static inline int verify_area(int type, const void * addr, unsigned long size)
{
return access_ok(type,addr,size) ? 0 : -EFAULT;
}
/*
* Uh, these should become the main single-value transfer routines ...
* They automatically use the right size if we just have the right
* pointer type ...
*
* As SuperH uses the same address space for kernel and user data, we
* can just do these as direct assignments.
*
* Careful to not
* (a) re-use the arguments for side effects (sizeof is ok)
* (b) require any knowledge of processes at this stage
*/
#define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr)))
#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
/*
* The "__xxx" versions do not do address space checking, useful when
* doing multiple accesses to the same area (the user has to do the
* checks by hand with "access_ok()")
*/
#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))
#define __get_user_nocheck(x,ptr,size) ({ \
long __gu_err; \
__typeof(*(ptr)) __gu_val; \
long __gu_addr; \
__asm__("":"=r" (__gu_val)); \
__gu_addr = (long) (ptr); \
__asm__("":"=r" (__gu_err)); \
switch (size) { \
case 1: __get_user_asm("b"); break; \
case 2: __get_user_asm("w"); break; \
case 4: __get_user_asm("l"); break; \
default: __get_user_unknown(); break; \
} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
#define __get_user_check(x,ptr,size) \
({ __typeof__(*(ptr)) __val; long __err; \
switch(size) { \
case 1: __err = __get_user_1(__val, ptr); break; \
case 2: __err = __get_user_2(__val, ptr); break; \
case 4: __err = __get_user_4(__val, ptr); break; \
default: __get_user_unknown(); break; \
} \
(x) = __val; __err; })
#define __get_user_1(x,ptr) ({ \
long __gu_err; \
__typeof__(*(ptr)) __gu_val; \
long __gu_addr = (long) (ptr); \
__asm__("stc r7_bank, %1\n\t" \
"mov.l @(8,%1), %1\n\t" \
"and %2, %1\n\t" \
"cmp/pz %1\n\t" \
"bt/s 1f\n\t" \
" mov #0, %0\n\t" \
"0:\n" \
"mov #-14, %0\n\t" \
"bra 2f\n\t" \
" mov #0, %1\n" \
"1:\n\t" \
"mov.b @%2, %1\n\t" \
"extu.b %1, %1\n" \
"2:\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 0b\n\t" \
".previous" \
: "=&r" (__gu_err), "=&r" (__gu_val) \
: "r" (__gu_addr) \
: "t"); \
x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
#define __get_user_2(x,ptr) ({ \
long __gu_err; \
__typeof__(*(ptr)) __gu_val; \
long __gu_addr = (long) (ptr); \
__asm__("stc r7_bank, %1\n\t" \
"mov.l @(8,%1), %1\n\t" \
"and %2, %1\n\t" \
"cmp/pz %1\n\t" \
"bt/s 1f\n\t" \
" mov #0, %0\n\t" \
"0:\n" \
"mov #-14, %0\n\t" \
"bra 2f\n\t" \
" mov #0, %1\n" \
"1:\n\t" \
"mov.w @%2, %1\n\t" \
"extu.w %1, %1\n" \
"2:\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 0b\n\t" \
".previous" \
: "=&r" (__gu_err), "=&r" (__gu_val) \
: "r" (__gu_addr) \
: "t"); \
x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
#define __get_user_4(x,ptr) ({ \
long __gu_err; \
__typeof__(*(ptr)) __gu_val; \
long __gu_addr = (long) (ptr); \
__asm__("stc r7_bank, %1\n\t" \
"mov.l @(8,%1), %1\n\t" \
"and %2, %1\n\t" \
"cmp/pz %1\n\t" \
"bt/s 1f\n\t" \
" mov #0, %0\n\t" \
"0:\n" \
"mov #-14, %0\n\t" \
"bra 2f\n\t" \
" mov #0, %1\n" \
"1:\n\t" \
"mov.l @%2, %1\n\t" \
"2:\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 0b\n\t" \
".previous" \
: "=&r" (__gu_err), "=&r" (__gu_val) \
: "r" (__gu_addr) \
: "t"); \
x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
#define __get_user_asm(insn) \
({ \
__asm__ __volatile__( \
"1:\n\t" \
"mov." insn " %2, %1\n\t" \
"mov #0, %0\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3:\n\t" \
"mov #0, %1\n\t" \
"mov.l 4f, %0\n\t" \
"jmp @%0\n\t" \
" mov %3, %0\n" \
"4: .long 2b\n\t" \
".previous\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 3b\n\t" \
".previous" \
:"=&r" (__gu_err), "=&r" (__gu_val) \
:"m" (__m(__gu_addr)), "i" (-EFAULT)); })
extern void __get_user_unknown(void);
#define __put_user_nocheck(x,ptr,size) ({ \
long __pu_err; \
__typeof__(*(ptr)) __pu_val; \
long __pu_addr; \
__pu_val = (x); \
__pu_addr = (long) (ptr); \
__asm__("":"=r" (__pu_err)); \
switch (size) { \
case 1: __put_user_asm("b"); break; \
case 2: __put_user_asm("w"); break; \
case 4: __put_user_asm("l"); break; \
case 8: __put_user_u64(__pu_val,__pu_addr,__pu_err); break; \
default: __put_user_unknown(); break; \
} __pu_err; })
#define __put_user_check(x,ptr,size) ({ \
long __pu_err; \
__typeof__(*(ptr)) __pu_val; \
long __pu_addr; \
__pu_val = (x); \
__pu_addr = (long) (ptr); \
__asm__("":"=r" (__pu_err)); \
if (__access_ok(__pu_addr,size)) { \
switch (size) { \
case 1: __put_user_asm("b"); break; \
case 2: __put_user_asm("w"); break; \
case 4: __put_user_asm("l"); break; \
case 8: __put_user_u64(__pu_val,__pu_addr,__pu_err); break; \
default: __put_user_unknown(); break; \
} } __pu_err; })
#define __put_user_asm(insn) \
({ \
__asm__ __volatile__( \
"1:\n\t" \
"mov." insn " %1, %2\n\t" \
"mov #0, %0\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3:\n\t" \
"nop\n\t" \
"mov.l 4f, %0\n\t" \
"jmp @%0\n\t" \
"mov %3, %0\n" \
"4: .long 2b\n\t" \
".previous\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 3b\n\t" \
".previous" \
:"=&r" (__pu_err) \
:"r" (__pu_val), "m" (__m(__pu_addr)), "i" (-EFAULT) \
:"memory"); })
#if defined(__LITTLE_ENDIAN__)
#define __put_user_u64(val,addr,retval) \
({ \
__asm__ __volatile__( \
"1:\n\t" \
"mov.l %R1,%2\n\t" \
"mov.l %S1,%T2\n\t" \
"mov #0,%0\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3:\n\t" \
"nop\n\t" \
"mov.l 4f,%0\n\t" \
"jmp @%0\n\t" \
" mov %3,%0\n" \
"4: .long 2b\n\t" \
".previous\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 3b\n\t" \
".previous" \
: "=r" (retval) \
: "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
: "memory"); })
#else
#define __put_user_u64(val,addr,retval) \
({ \
__asm__ __volatile__( \
"1:\n\t" \
"mov.l %S1,%2\n\t" \
"mov.l %R1,%T2\n\t" \
"mov #0,%0\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3:\n\t" \
"nop\n\t" \
"mov.l 4f,%0\n\t" \
"jmp @%0\n\t" \
" mov %3,%0\n" \
"4: .long 2b\n\t" \
".previous\n" \
".section __ex_table,\"a\"\n\t" \
".long 1b, 3b\n\t" \
".previous" \
: "=r" (retval) \
: "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
: "memory"); })
#endif
extern void __put_user_unknown(void);
/* Generic arbitrary sized copy. */
/* Return the number of bytes NOT copied */
extern __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
#define copy_to_user(to,from,n) ({ \
void *__copy_to = (void *) (to); \
__kernel_size_t __copy_size = (__kernel_size_t) (n); \
__kernel_size_t __copy_res; \
if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \
__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \
} else __copy_res = __copy_size; \
__copy_res; })
#define __copy_to_user(to,from,n) \
__copy_user((void *)(to), \
(void *)(from), n)
#define copy_from_user(to,from,n) ({ \
void *__copy_to = (void *) (to); \
void *__copy_from = (void *) (from); \
__kernel_size_t __copy_size = (__kernel_size_t) (n); \
__kernel_size_t __copy_res; \
if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \
__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \
} else __copy_res = __copy_size; \
__copy_res; })
#define __copy_from_user(to,from,n) \
__copy_user((void *)(to), \
(void *)(from), n)
/*
* Clear the area and return remaining number of bytes
* (on failure. Usually it's 0.)
*/
extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
#define clear_user(addr,n) ({ \
void * __cl_addr = (addr); \
unsigned long __cl_size = (n); \
if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
__cl_size = __clear_user(__cl_addr, __cl_size); \
__cl_size; })
static __inline__ int
__strncpy_from_user(unsigned long __dest, unsigned long __src, int __count)
{
__kernel_size_t res;
unsigned long __dummy, _d, _s;
__asm__ __volatile__(
"9:\n"
"mov.b @%2+, %1\n\t"
"cmp/eq #0, %1\n\t"
"bt/s 2f\n"
"1:\n"
"mov.b %1, @%3\n\t"
"dt %7\n\t"
"bf/s 9b\n\t"
" add #1, %3\n\t"
"2:\n\t"
"sub %7, %0\n"
"3:\n"
".section .fixup,\"ax\"\n"
"4:\n\t"
"mov.l 5f, %1\n\t"
"jmp @%1\n\t"
" mov %8, %0\n\t"
".balign 4\n"
"5: .long 3b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .balign 4\n"
" .long 9b,4b\n"
".previous"
: "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d)
: "0" (__count), "2" (__src), "3" (__dest), "r" (__count),
"i" (-EFAULT)
: "memory", "t");
return res;
}
#define strncpy_from_user(dest,src,count) ({ \
unsigned long __sfu_src = (unsigned long) (src); \
int __sfu_count = (int) (count); \
long __sfu_res = -EFAULT; \
if(__access_ok(__sfu_src, __sfu_count)) { \
__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
} __sfu_res; })
/*
* Return the size of a string (including the ending 0!)
*/
static __inline__ long __strnlen_user(const char *__s, long __n)
{
unsigned long res;
unsigned long __dummy;
__asm__ __volatile__(
"9:\n"
"cmp/eq %4, %0\n\t"
"bt 2f\n"
"1:\t"
"mov.b @(%0,%3), %1\n\t"
"tst %1, %1\n\t"
"bf/s 9b\n\t"
" add #1, %0\n"
"2:\n"
".section .fixup,\"ax\"\n"
"3:\n\t"
"mov.l 4f, %1\n\t"
"jmp @%1\n\t"
" mov %5, %0\n"
".balign 4\n"
"4: .long 2b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .balign 4\n"
" .long 1b,3b\n"
".previous"
: "=z" (res), "=&r" (__dummy)
: "0" (0), "r" (__s), "r" (__n), "i" (-EFAULT)
: "t");
return res;
}
static __inline__ long strnlen_user(const char *s, long n)
{
if (!access_ok(VERIFY_READ, s, n))
return 0;
else
return __strnlen_user(s, n);
}
static __inline__ long strlen_user(const char *s)
{
if (!access_ok(VERIFY_READ, s, 0))
return 0;
else
return __strnlen_user(s, ~0UL >> 1);
}
struct exception_table_entry
{
unsigned long insn, fixup;
};
#endif /* __ASM_SH_UACCESS_H */
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