/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H
#include <linux/errno.h>
#include <linux/thread_info.h>
/*
* 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, these macros are grossly misnamed.
*/
#ifdef CONFIG_MIPS32
#define __UA_ADDR ".word"
#define __UA_LA "la"
#define __UA_ADDU "addu"
#define KERNEL_DS ((mm_segment_t) { (unsigned long) 0L })
#define USER_DS ((mm_segment_t) { (unsigned long) -1L })
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define __access_ok(addr, size, mask) \
(((signed long)((mask)&(addr | ((addr) + (size)) | __ua_size(size)))) >= 0)
#define __access_mask ((long)(get_fs().seg))
#define access_ok(type, addr, size) \
__access_ok(((unsigned long)(addr)),(size),__access_mask)
#endif /* CONFIG_MIPS32 */
#ifdef CONFIG_MIPS64
#define __UA_ADDR ".dword"
#define __UA_LA "dla"
#define __UA_ADDU "daddu"
#define KERNEL_DS ((mm_segment_t) { 0UL })
#define USER_DS ((mm_segment_t) { -TASK_SIZE })
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define __access_ok(addr, size, mask) \
(((signed long)((mask) & ((addr) | ((addr) + (size)) | __ua_size(size)))) == 0)
#define __access_mask get_fs().seg
#define access_ok(type, addr, size) \
__access_ok((unsigned long)(addr), (size), __access_mask)
#endif /* CONFIG_MIPS64 */
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a,b) ((a).seg == (b).seg)
/*
* Is a address valid? This does a straighforward calculation rather
* than tests.
*
* Address valid if:
* - "addr" doesn't have any high-bits set
* - AND "size" doesn't have any high-bits set
* - AND "addr+size" doesn't have any high-bits set
* - OR we are in kernel mode.
*
* __ua_size() is a trick to avoid runtime checking of positive constant
* sizes; for those we already know at compile time that the size is ok.
*/
#define __ua_size(size) \
((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (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 MIPS 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((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
#define get_user(x,ptr) \
__get_user_check((__typeof__(*(ptr)))(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((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))
/*
* Yuck. We need two variants, one for 64bit operation and one
* for 32 bit mode and old iron.
*/
#ifdef __mips64
#define __GET_USER_DW __get_user_asm("ld")
#else
#define __GET_USER_DW __get_user_asm_ll32
#endif
#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("lb"); break; \
case 2: __get_user_asm("lh"); break; \
case 4: __get_user_asm("lw"); break; \
case 8: __GET_USER_DW; break; \
default: __get_user_unknown(); break; \
} x = (__typeof__(*(ptr))) __gu_val; __gu_err; \
})
#define __get_user_check(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)); \
if (__access_ok(__gu_addr,size,__access_mask)) { \
switch (size) { \
case 1: __get_user_asm("lb"); break; \
case 2: __get_user_asm("lh"); break; \
case 4: __get_user_asm("lw"); break; \
case 8: __GET_USER_DW; break; \
default: __get_user_unknown(); break; \
} \
} x = (__typeof__(*(ptr))) __gu_val; __gu_err; \
})
#define __get_user_asm(insn) \
({ \
__asm__ __volatile__( \
"1:\t" insn "\t%1,%2\n\t" \
"move\t%0,$0\n" \
"2:\n\t" \
".section\t.fixup,\"ax\"\n" \
"3:\tli\t%0,%3\n\t" \
"move\t%1,$0\n\t" \
"j\t2b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
__UA_ADDR "\t1b,3b\n\t" \
".previous" \
:"=r" (__gu_err), "=r" (__gu_val) \
:"o" (__m(__gu_addr)), "i" (-EFAULT)); \
})
/*
* Get a long long 64 using 32 bit registers.
*/
#define __get_user_asm_ll32 \
({ \
__asm__ __volatile__( \
"1:\tlw\t%1,%2\n" \
"2:\tlw\t%D1,%3\n\t" \
"move\t%0,$0\n" \
"3:\t.section\t.fixup,\"ax\"\n" \
"4:\tli\t%0,%4\n\t" \
"move\t%1,$0\n\t" \
"move\t%D1,$0\n\t" \
"j\t3b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
__UA_ADDR "\t1b,4b\n\t" \
__UA_ADDR "\t2b,4b\n\t" \
".previous" \
:"=r" (__gu_err), "=&r" (__gu_val) \
:"o" (__m(__gu_addr)), "o" (__m(__gu_addr + 4)), \
"i" (-EFAULT)); \
})
extern void __get_user_unknown(void);
/*
* Yuck. We need two variants, one for 64bit operation and one
* for 32 bit mode and old iron.
*/
#ifdef __mips64
#define __PUT_USER_DW __put_user_asm("sd")
#else
#define __PUT_USER_DW __put_user_asm_ll32
#endif
#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("sb"); break; \
case 2: __put_user_asm("sh"); break; \
case 4: __put_user_asm("sw"); break; \
case 8: __PUT_USER_DW; 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,__access_mask)) { \
switch (size) { \
case 1: __put_user_asm("sb"); break; \
case 2: __put_user_asm("sh"); break; \
case 4: __put_user_asm("sw"); break; \
case 8: __PUT_USER_DW; break; \
default: __put_user_unknown(); break; \
} \
} \
__pu_err; \
})
#define __put_user_asm(insn) \
({ \
__asm__ __volatile__( \
"1:\t" insn "\t%z1, %2\t\t\t# __put_user_asm\n\t" \
"move\t%0, $0\n" \
"2:\n\t" \
".section\t.fixup,\"ax\"\n" \
"3:\tli\t%0,%3\n\t" \
"j\t2b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
__UA_ADDR "\t1b,3b\n\t" \
".previous" \
:"=r" (__pu_err) \
:"Jr" (__pu_val), "o" (__m(__pu_addr)), "i" (-EFAULT)); \
})
#define __put_user_asm_ll32 \
({ \
__asm__ __volatile__( \
"1:\tsw\t%1, %2\t\t\t# __put_user_asm_ll32\n\t" \
"2:\tsw\t%D1, %3\n" \
"move\t%0, $0\n" \
"3:\n\t" \
".section\t.fixup,\"ax\"\n" \
"4:\tli\t%0,%4\n\t" \
"j\t3b\n\t" \
".previous\n\t" \
".section\t__ex_table,\"a\"\n\t" \
__UA_ADDR "\t1b,4b\n\t" \
__UA_ADDR "\t2b,4b\n\t" \
".previous" \
:"=r" (__pu_err) \
:"r" (__pu_val), "o" (__m(__pu_addr)), \
"o" (__m(__pu_addr + 4)), "i" (-EFAULT)); \
})
extern void __put_user_unknown(void);
/*
* We're generating jump to subroutines which will be outside the range of
* jump instructions
*/
#ifdef MODULE
#define __MODULE_JAL(destination) \
".set\tnoat\n\t" \
__UA_LA "\t$1, " #destination "\n\t" \
"jalr\t$1\n\t" \
".set\tat\n\t"
#else
#define __MODULE_JAL(destination) \
"jal\t" #destination "\n\t"
#endif
extern size_t __copy_user(void *__to, const void *__from, size_t __n);
#define __invoke_copy_to_user(to,from,n) \
({ \
register void *__cu_to_r __asm__ ("$4"); \
register const void *__cu_from_r __asm__ ("$5"); \
register long __cu_len_r __asm__ ("$6"); \
\
__cu_to_r = (to); \
__cu_from_r = (from); \
__cu_len_r = (n); \
__asm__ __volatile__( \
__MODULE_JAL(__copy_user) \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
"memory"); \
__cu_len_r; \
})
#define __copy_to_user(to,from,n) \
({ \
void *__cu_to; \
const void *__cu_from; \
long __cu_len; \
\
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
__cu_len; \
})
#define copy_to_user(to,from,n) \
({ \
void *__cu_to; \
const void *__cu_from; \
long __cu_len; \
\
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) \
__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
__cu_len); \
__cu_len; \
})
#define __invoke_copy_from_user(to,from,n) \
({ \
register void *__cu_to_r __asm__ ("$4"); \
register const void *__cu_from_r __asm__ ("$5"); \
register long __cu_len_r __asm__ ("$6"); \
\
__cu_to_r = (to); \
__cu_from_r = (from); \
__cu_len_r = (n); \
__asm__ __volatile__( \
".set\tnoreorder\n\t" \
__MODULE_JAL(__copy_user) \
".set\tnoat\n\t" \
__UA_ADDU "\t$1, %1, %2\n\t" \
".set\tat\n\t" \
".set\treorder\n\t" \
"move\t%0, $6" /* XXX */ \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
"memory"); \
__cu_len_r; \
})
#define __copy_from_user(to,from,n) \
({ \
void *__cu_to; \
const void *__cu_from; \
long __cu_len; \
\
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
__cu_len); \
__cu_len; \
})
#define copy_from_user(to,from,n) \
({ \
void *__cu_to; \
const void *__cu_from; \
long __cu_len; \
\
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
if (access_ok(VERIFY_READ, __cu_from, __cu_len)) \
__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
__cu_len); \
__cu_len; \
})
static inline __kernel_size_t
__clear_user(void *addr, __kernel_size_t size)
{
__kernel_size_t res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
"move\t$5, $0\n\t"
"move\t$6, %2\n\t"
__MODULE_JAL(__bzero)
"move\t%0, $6"
: "=r" (res)
: "r" (addr), "r" (size)
: "$4", "$5", "$6", "$8", "$9", "$31");
return res;
}
#define clear_user(addr,n) \
({ \
void * __cl_addr = (addr); \
unsigned long __cl_size = (n); \
if (__cl_size && access_ok(VERIFY_WRITE, \
((unsigned long)(__cl_addr)), __cl_size)) \
__cl_size = __clear_user(__cl_addr, __cl_size); \
__cl_size; \
})
/*
* Returns: -EFAULT if exception before terminator, N if the entire
* buffer filled, else strlen.
*/
static inline long
__strncpy_from_user(char *__to, const char *__from, long __len)
{
long res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
"move\t$5, %2\n\t"
"move\t$6, %3\n\t"
__MODULE_JAL(__strncpy_from_user_nocheck_asm)
"move\t%0, $2"
: "=r" (res)
: "r" (__to), "r" (__from), "r" (__len)
: "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
return res;
}
static inline long
strncpy_from_user(char *__to, const char *__from, long __len)
{
long res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
"move\t$5, %2\n\t"
"move\t$6, %3\n\t"
__MODULE_JAL(__strncpy_from_user_asm)
"move\t%0, $2"
: "=r" (res)
: "r" (__to), "r" (__from), "r" (__len)
: "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
return res;
}
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
static inline long __strlen_user(const char *s)
{
long res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
__MODULE_JAL(__strlen_user_nocheck_asm)
"move\t%0, $2"
: "=r" (res)
: "r" (s)
: "$2", "$4", "$8", "$31");
return res;
}
static inline long strlen_user(const char *s)
{
long res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
__MODULE_JAL(__strlen_user_asm)
"move\t%0, $2"
: "=r" (res)
: "r" (s)
: "$2", "$4", "$8", "$31");
return res;
}
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
static inline long __strnlen_user(const char *s, long n)
{
long res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
"move\t$5, %2\n\t"
__MODULE_JAL(__strnlen_user_nocheck_asm)
"move\t%0, $2"
: "=r" (res)
: "r" (s), "r" (n)
: "$2", "$4", "$5", "$8", "$31");
return res;
}
static inline long strnlen_user(const char *s, long n)
{
long res;
__asm__ __volatile__(
"move\t$4, %1\n\t"
"move\t$5, %2\n\t"
__MODULE_JAL(__strnlen_user_asm)
"move\t%0, $2"
: "=r" (res)
: "r" (s), "r" (n)
: "$2", "$4", "$5", "$8", "$31");
return res;
}
struct exception_table_entry
{
unsigned long insn;
unsigned long nextinsn;
};
#endif /* _ASM_UACCESS_H */
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