a8a77573c9
Add general annotations to the FRV arch for sparse. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
319 lines
8.2 KiB
C
319 lines
8.2 KiB
C
/* uaccess.h: userspace accessor functions
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_UACCESS_H
|
|
#define _ASM_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/sections.h>
|
|
|
|
#define HAVE_ARCH_UNMAPPED_AREA /* we decide where to put mmaps */
|
|
|
|
#define __ptr(x) ((unsigned long __force *)(x))
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
#define __addr_ok(addr) ((unsigned long)(addr) < get_addr_limit())
|
|
|
|
/*
|
|
* check that a range of addresses falls within the current address limit
|
|
*/
|
|
static inline int ___range_ok(unsigned long addr, unsigned long size)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
int flag = -EFAULT, tmp;
|
|
|
|
asm volatile (
|
|
" addcc %3,%2,%1,icc0 \n" /* set C-flag if addr+size>4GB */
|
|
" subcc.p %1,%4,gr0,icc1 \n" /* jump if addr+size>limit */
|
|
" bc icc0,#0,0f \n"
|
|
" bhi icc1,#0,0f \n"
|
|
" setlos #0,%0 \n" /* mark okay */
|
|
"0: \n"
|
|
: "=r"(flag), "=&r"(tmp)
|
|
: "r"(addr), "r"(size), "r"(get_addr_limit()), "0"(flag)
|
|
);
|
|
|
|
return flag;
|
|
|
|
#else
|
|
|
|
if (addr < memory_start ||
|
|
addr > memory_end ||
|
|
size > memory_end - memory_start ||
|
|
addr + size > memory_end)
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
#define __range_ok(addr,size) ___range_ok((unsigned long) (addr), (unsigned long) (size))
|
|
|
|
#define access_ok(type,addr,size) (__range_ok((void __user *)(addr), (size)) == 0)
|
|
#define __access_ok(addr,size) (__range_ok((addr), (size)) == 0)
|
|
|
|
/*
|
|
* 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;
|
|
};
|
|
|
|
/* Returns 0 if exception not found and fixup otherwise. */
|
|
extern unsigned long search_exception_table(unsigned long);
|
|
|
|
|
|
/*
|
|
* These are the main single-value transfer routines. They automatically
|
|
* use the right size if we just have the right pointer type.
|
|
*/
|
|
#define __put_user(x, ptr) \
|
|
({ \
|
|
int __pu_err = 0; \
|
|
\
|
|
typeof(*(ptr)) __pu_val = (x); \
|
|
__chk_user_ptr(ptr); \
|
|
\
|
|
switch (sizeof (*(ptr))) { \
|
|
case 1: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, "b", "r"); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, "h", "r"); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, "", "r"); \
|
|
break; \
|
|
case 8: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, "d", "e"); \
|
|
break; \
|
|
default: \
|
|
__pu_err = __put_user_bad(); \
|
|
break; \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define put_user(x, ptr) \
|
|
({ \
|
|
typeof(*(ptr)) __user *_p = (ptr); \
|
|
int _e; \
|
|
\
|
|
_e = __range_ok(_p, sizeof(*_p)); \
|
|
if (_e == 0) \
|
|
_e = __put_user((x), _p); \
|
|
_e; \
|
|
})
|
|
|
|
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.
|
|
*/
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
#define __put_user_asm(err,x,ptr,dsize,constraint) \
|
|
do { \
|
|
asm volatile("1: st"dsize"%I1 %2,%M1 \n" \
|
|
"2: \n" \
|
|
".subsection 2 \n" \
|
|
"3: setlos %3,%0 \n" \
|
|
" bra 2b \n" \
|
|
".previous \n" \
|
|
".section __ex_table,\"a\" \n" \
|
|
" .balign 8 \n" \
|
|
" .long 1b,3b \n" \
|
|
".previous" \
|
|
: "=r" (err) \
|
|
: "m" (*__ptr(ptr)), constraint (x), "i"(-EFAULT), "0"(err) \
|
|
: "memory"); \
|
|
} while (0)
|
|
|
|
#else
|
|
|
|
#define __put_user_asm(err,x,ptr,bwl,con) \
|
|
do { \
|
|
asm(" st"bwl"%I0 %1,%M0 \n" \
|
|
" membar \n" \
|
|
: \
|
|
: "m" (*__ptr(ptr)), con (x) \
|
|
: "memory"); \
|
|
} while (0)
|
|
|
|
#endif
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
*
|
|
*/
|
|
#define __get_user(x, ptr) \
|
|
({ \
|
|
int __gu_err = 0; \
|
|
__chk_user_ptr(ptr); \
|
|
\
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: { \
|
|
unsigned char __gu_val; \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, "ub", "=r"); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
|
|
break; \
|
|
} \
|
|
case 2: { \
|
|
unsigned short __gu_val; \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, "uh", "=r"); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
|
|
break; \
|
|
} \
|
|
case 4: { \
|
|
unsigned int __gu_val; \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, "", "=r"); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
|
|
break; \
|
|
} \
|
|
case 8: { \
|
|
unsigned long long __gu_val; \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, "d", "=e"); \
|
|
(x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
|
|
break; \
|
|
} \
|
|
default: \
|
|
__gu_err = __get_user_bad(); \
|
|
break; \
|
|
} \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define get_user(x, ptr) \
|
|
({ \
|
|
const typeof(*(ptr)) __user *_p = (ptr);\
|
|
int _e; \
|
|
\
|
|
_e = __range_ok(_p, sizeof(*_p)); \
|
|
if (likely(_e == 0)) \
|
|
_e = __get_user((x), _p); \
|
|
else \
|
|
(x) = (typeof(x)) 0; \
|
|
_e; \
|
|
})
|
|
|
|
extern int __get_user_bad(void);
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
#define __get_user_asm(err,x,ptr,dtype,constraint) \
|
|
do { \
|
|
asm("1: ld"dtype"%I2 %M2,%1 \n" \
|
|
"2: \n" \
|
|
".subsection 2 \n" \
|
|
"3: setlos %3,%0 \n" \
|
|
" setlos #0,%1 \n" \
|
|
" bra 2b \n" \
|
|
".previous \n" \
|
|
".section __ex_table,\"a\" \n" \
|
|
" .balign 8 \n" \
|
|
" .long 1b,3b \n" \
|
|
".previous" \
|
|
: "=r" (err), constraint (x) \
|
|
: "m" (*__ptr(ptr)), "i"(-EFAULT), "0"(err) \
|
|
); \
|
|
} while(0)
|
|
|
|
#else
|
|
|
|
#define __get_user_asm(err,x,ptr,bwl,con) \
|
|
asm(" ld"bwl"%I1 %M1,%0 \n" \
|
|
" membar \n" \
|
|
: con(x) \
|
|
: "m" (*__ptr(ptr)))
|
|
|
|
#endif
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
*
|
|
*/
|
|
#define ____force(x) (__force void *)(void __user *)(x)
|
|
#ifdef CONFIG_MMU
|
|
extern long __memset_user(void *dst, unsigned long count);
|
|
extern long __memcpy_user(void *dst, const void *src, unsigned long count);
|
|
|
|
#define clear_user(dst,count) __memset_user(____force(dst), (count))
|
|
#define __copy_from_user_inatomic(to, from, n) __memcpy_user((to), ____force(from), (n))
|
|
#define __copy_to_user_inatomic(to, from, n) __memcpy_user(____force(to), (from), (n))
|
|
|
|
#else
|
|
|
|
#define clear_user(dst,count) (memset(____force(dst), 0, (count)), 0)
|
|
#define __copy_from_user_inatomic(to, from, n) (memcpy((to), ____force(from), (n)), 0)
|
|
#define __copy_to_user_inatomic(to, from, n) (memcpy(____force(to), (from), (n)), 0)
|
|
|
|
#endif
|
|
|
|
static inline unsigned long __must_check
|
|
__copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
might_sleep();
|
|
return __copy_to_user_inatomic(to, from, n);
|
|
}
|
|
|
|
static inline unsigned long
|
|
__copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
might_sleep();
|
|
return __copy_from_user_inatomic(to, from, n);
|
|
}
|
|
|
|
static inline long copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
unsigned long ret = n;
|
|
|
|
if (likely(__access_ok(from, n)))
|
|
ret = __copy_from_user(to, from, n);
|
|
|
|
if (unlikely(ret != 0))
|
|
memset(to + (n - ret), 0, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline long copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
return likely(__access_ok(to, n)) ? __copy_to_user(to, from, n) : n;
|
|
}
|
|
|
|
extern long strncpy_from_user(char *dst, const char __user *src, long count);
|
|
extern long strnlen_user(const char __user *src, long count);
|
|
|
|
#define strlen_user(str) strnlen_user(str, 32767)
|
|
|
|
extern unsigned long search_exception_table(unsigned long addr);
|
|
|
|
#endif /* _ASM_UACCESS_H */
|