97de50c0ad
Remove the deprecated (and unused) verify_area() from various uaccess.h headers. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
595 lines
14 KiB
C
595 lines
14 KiB
C
/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 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 __user *p, unsigned long size)
|
||
{
|
||
unsigned long addr = (unsigned long)p;
|
||
return __access_ok(addr, size);
|
||
}
|
||
|
||
/*
|
||
* 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((__typeof__(*(ptr)))(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_size(x,ptr,size,retval) \
|
||
do { \
|
||
retval = 0; \
|
||
switch (size) { \
|
||
case 1: \
|
||
__get_user_asm(x, ptr, retval, "b"); \
|
||
break; \
|
||
case 2: \
|
||
__get_user_asm(x, ptr, retval, "w"); \
|
||
break; \
|
||
case 4: \
|
||
__get_user_asm(x, ptr, retval, "l"); \
|
||
break; \
|
||
default: \
|
||
__get_user_unknown(); \
|
||
break; \
|
||
} \
|
||
} while (0)
|
||
|
||
#define __get_user_nocheck(x,ptr,size) \
|
||
({ \
|
||
long __gu_err, __gu_val; \
|
||
__get_user_size(__gu_val, (ptr), (size), __gu_err); \
|
||
(x) = (__typeof__(*(ptr)))__gu_val; \
|
||
__gu_err; \
|
||
})
|
||
|
||
#define __get_user_check(x,ptr,size) \
|
||
({ \
|
||
long __gu_err, __gu_val; \
|
||
switch (size) { \
|
||
case 1: \
|
||
__get_user_1(__gu_val, (ptr), __gu_err); \
|
||
break; \
|
||
case 2: \
|
||
__get_user_2(__gu_val, (ptr), __gu_err); \
|
||
break; \
|
||
case 4: \
|
||
__get_user_4(__gu_val, (ptr), __gu_err); \
|
||
break; \
|
||
default: \
|
||
__get_user_unknown(); \
|
||
break; \
|
||
} \
|
||
\
|
||
(x) = (__typeof__(*(ptr)))__gu_val; \
|
||
__gu_err; \
|
||
})
|
||
|
||
#define __get_user_1(x,addr,err) ({ \
|
||
__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" (err), "=&r" (x) \
|
||
: "r" (addr) \
|
||
: "t"); \
|
||
})
|
||
|
||
#define __get_user_2(x,addr,err) ({ \
|
||
__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" (err), "=&r" (x) \
|
||
: "r" (addr) \
|
||
: "t"); \
|
||
})
|
||
|
||
#define __get_user_4(x,addr,err) ({ \
|
||
__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" (err), "=&r" (x) \
|
||
: "r" (addr) \
|
||
: "t"); \
|
||
})
|
||
|
||
#define __get_user_asm(x, addr, err, 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" (err), "=&r" (x) \
|
||
:"m" (__m(addr)), "i" (-EFAULT)); })
|
||
|
||
extern void __get_user_unknown(void);
|
||
|
||
#define __put_user_size(x,ptr,size,retval) \
|
||
do { \
|
||
retval = 0; \
|
||
switch (size) { \
|
||
case 1: \
|
||
__put_user_asm(x, ptr, retval, "b"); \
|
||
break; \
|
||
case 2: \
|
||
__put_user_asm(x, ptr, retval, "w"); \
|
||
break; \
|
||
case 4: \
|
||
__put_user_asm(x, ptr, retval, "l"); \
|
||
break; \
|
||
case 8: \
|
||
__put_user_u64(x, ptr, retval); \
|
||
break; \
|
||
default: \
|
||
__put_user_unknown(); \
|
||
} \
|
||
} while (0)
|
||
|
||
#define __put_user_nocheck(x,ptr,size) \
|
||
({ \
|
||
long __pu_err; \
|
||
__put_user_size((x),(ptr),(size),__pu_err); \
|
||
__pu_err; \
|
||
})
|
||
|
||
#define __put_user_check(x,ptr,size) \
|
||
({ \
|
||
long __pu_err = -EFAULT; \
|
||
__typeof__(*(ptr)) *__pu_addr = (ptr); \
|
||
\
|
||
if (__access_ok((unsigned long)__pu_addr,size)) \
|
||
__put_user_size((x),__pu_addr,(size),__pu_err); \
|
||
__pu_err; \
|
||
})
|
||
|
||
#define __put_user_asm(x, addr, err, 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" (err) \
|
||
:"r" (x), "m" (__m(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_to_user_inatomic __copy_to_user
|
||
#define __copy_from_user_inatomic __copy_from_user
|
||
|
||
|
||
#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 __user __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 __user *__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 __user *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 __user *s)
|
||
{
|
||
if (!access_ok(VERIFY_READ, s, 0))
|
||
return 0;
|
||
else
|
||
return __strnlen_user(s, ~0UL >> 1);
|
||
}
|
||
|
||
/*
|
||
* 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);
|
||
|
||
#endif /* __ASM_SH_UACCESS_H */
|