mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
70f9cac5e0
Convert access_ok() from a macro to an inline function, so the compiler no
longer complains about unused variables:
fs/read_write.c: In function 'rw_copy_check_uvector':
fs/read_write.c:556: warning: unused variable 'buf'
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
375 lines
9.8 KiB
C
375 lines
9.8 KiB
C
#ifndef __M68K_UACCESS_H
|
|
#define __M68K_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/segment.h>
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
/* We let the MMU do all checking */
|
|
static inline int access_ok(int type, const void __user *addr,
|
|
unsigned long size)
|
|
{
|
|
return 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 __put_user_bad(void);
|
|
extern int __get_user_bad(void);
|
|
|
|
#define __put_user_asm(res, x, ptr, bwl, reg, err) \
|
|
asm volatile ("\n" \
|
|
"1: moves."#bwl" %2,%1\n" \
|
|
"2:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"10: moveq.l %3,%0\n" \
|
|
" jra 2b\n" \
|
|
" .previous\n" \
|
|
"\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,10b\n" \
|
|
" .long 2b,10b\n" \
|
|
" .previous" \
|
|
: "+d" (res), "=m" (*(ptr)) \
|
|
: #reg (x), "i" (err))
|
|
|
|
/*
|
|
* 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) \
|
|
({ \
|
|
typeof(*(ptr)) __pu_val = (x); \
|
|
int __pu_err = 0; \
|
|
__chk_user_ptr(ptr); \
|
|
switch (sizeof (*(ptr))) { \
|
|
case 1: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, w, d, -EFAULT); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
|
|
break; \
|
|
case 8: \
|
|
{ \
|
|
const void __user *__pu_ptr = (ptr); \
|
|
asm volatile ("\n" \
|
|
"1: moves.l %2,(%1)+\n" \
|
|
"2: moves.l %R2,(%1)\n" \
|
|
"3:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"10: movel %3,%0\n" \
|
|
" jra 3b\n" \
|
|
" .previous\n" \
|
|
"\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,10b\n" \
|
|
" .long 2b,10b\n" \
|
|
" .long 3b,10b\n" \
|
|
" .previous" \
|
|
: "+d" (__pu_err), "+a" (__pu_ptr) \
|
|
: "r" (__pu_val), "i" (-EFAULT) \
|
|
: "memory"); \
|
|
break; \
|
|
} \
|
|
default: \
|
|
__pu_err = __put_user_bad(); \
|
|
break; \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
#define put_user(x, ptr) __put_user(x, ptr)
|
|
|
|
|
|
#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \
|
|
type __gu_val; \
|
|
asm volatile ("\n" \
|
|
"1: moves."#bwl" %2,%1\n" \
|
|
"2:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"10: move.l %3,%0\n" \
|
|
" sub."#bwl" %1,%1\n" \
|
|
" jra 2b\n" \
|
|
" .previous\n" \
|
|
"\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,10b\n" \
|
|
" .previous" \
|
|
: "+d" (res), "=&" #reg (__gu_val) \
|
|
: "m" (*(ptr)), "i" (err)); \
|
|
(x) = (typeof(*(ptr)))(unsigned long)__gu_val; \
|
|
})
|
|
|
|
#define __get_user(x, ptr) \
|
|
({ \
|
|
int __gu_err = 0; \
|
|
__chk_user_ptr(ptr); \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: \
|
|
__get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm(__gu_err, x, ptr, u16, w, d, -EFAULT); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \
|
|
break; \
|
|
/* case 8: disabled because gcc-4.1 has a broken typeof \
|
|
{ \
|
|
const void *__gu_ptr = (ptr); \
|
|
u64 __gu_val; \
|
|
asm volatile ("\n" \
|
|
"1: moves.l (%2)+,%1\n" \
|
|
"2: moves.l (%2),%R1\n" \
|
|
"3:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"10: move.l %3,%0\n" \
|
|
" sub.l %1,%1\n" \
|
|
" sub.l %R1,%R1\n" \
|
|
" jra 3b\n" \
|
|
" .previous\n" \
|
|
"\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,10b\n" \
|
|
" .long 2b,10b\n" \
|
|
" .previous" \
|
|
: "+d" (__gu_err), "=&r" (__gu_val), \
|
|
"+a" (__gu_ptr) \
|
|
: "i" (-EFAULT) \
|
|
: "memory"); \
|
|
(x) = (typeof(*(ptr)))__gu_val; \
|
|
break; \
|
|
} */ \
|
|
default: \
|
|
__gu_err = __get_user_bad(); \
|
|
break; \
|
|
} \
|
|
__gu_err; \
|
|
})
|
|
#define get_user(x, ptr) __get_user(x, ptr)
|
|
|
|
unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
|
|
unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);
|
|
|
|
#define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\
|
|
asm volatile ("\n" \
|
|
"1: moves."#s1" (%2)+,%3\n" \
|
|
" move."#s1" %3,(%1)+\n" \
|
|
"2: moves."#s2" (%2)+,%3\n" \
|
|
" move."#s2" %3,(%1)+\n" \
|
|
" .ifnc \""#s3"\",\"\"\n" \
|
|
"3: moves."#s3" (%2)+,%3\n" \
|
|
" move."#s3" %3,(%1)+\n" \
|
|
" .endif\n" \
|
|
"4:\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,10f\n" \
|
|
" .long 2b,20f\n" \
|
|
" .ifnc \""#s3"\",\"\"\n" \
|
|
" .long 3b,30f\n" \
|
|
" .endif\n" \
|
|
" .previous\n" \
|
|
"\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"10: clr."#s1" (%1)+\n" \
|
|
"20: clr."#s2" (%1)+\n" \
|
|
" .ifnc \""#s3"\",\"\"\n" \
|
|
"30: clr."#s3" (%1)+\n" \
|
|
" .endif\n" \
|
|
" moveq.l #"#n",%0\n" \
|
|
" jra 4b\n" \
|
|
" .previous\n" \
|
|
: "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \
|
|
: : "memory")
|
|
|
|
static __always_inline unsigned long
|
|
__constant_copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
unsigned long res = 0, tmp;
|
|
|
|
switch (n) {
|
|
case 1:
|
|
__get_user_asm(res, *(u8 *)to, (u8 __user *)from, u8, b, d, 1);
|
|
break;
|
|
case 2:
|
|
__get_user_asm(res, *(u16 *)to, (u16 __user *)from, u16, w, d, 2);
|
|
break;
|
|
case 3:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,);
|
|
break;
|
|
case 4:
|
|
__get_user_asm(res, *(u32 *)to, (u32 __user *)from, u32, l, r, 4);
|
|
break;
|
|
case 5:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,);
|
|
break;
|
|
case 6:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,);
|
|
break;
|
|
case 7:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b);
|
|
break;
|
|
case 8:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,);
|
|
break;
|
|
case 9:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b);
|
|
break;
|
|
case 10:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w);
|
|
break;
|
|
case 12:
|
|
__constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l);
|
|
break;
|
|
default:
|
|
/* we limit the inlined version to 3 moves */
|
|
return __generic_copy_from_user(to, from, n);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \
|
|
asm volatile ("\n" \
|
|
" move."#s1" (%2)+,%3\n" \
|
|
"11: moves."#s1" %3,(%1)+\n" \
|
|
"12: move."#s2" (%2)+,%3\n" \
|
|
"21: moves."#s2" %3,(%1)+\n" \
|
|
"22:\n" \
|
|
" .ifnc \""#s3"\",\"\"\n" \
|
|
" move."#s3" (%2)+,%3\n" \
|
|
"31: moves."#s3" %3,(%1)+\n" \
|
|
"32:\n" \
|
|
" .endif\n" \
|
|
"4:\n" \
|
|
"\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 11b,5f\n" \
|
|
" .long 12b,5f\n" \
|
|
" .long 21b,5f\n" \
|
|
" .long 22b,5f\n" \
|
|
" .ifnc \""#s3"\",\"\"\n" \
|
|
" .long 31b,5f\n" \
|
|
" .long 32b,5f\n" \
|
|
" .endif\n" \
|
|
" .previous\n" \
|
|
"\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"5: moveq.l #"#n",%0\n" \
|
|
" jra 4b\n" \
|
|
" .previous\n" \
|
|
: "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \
|
|
: : "memory")
|
|
|
|
static __always_inline unsigned long
|
|
__constant_copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
unsigned long res = 0, tmp;
|
|
|
|
switch (n) {
|
|
case 1:
|
|
__put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
|
|
break;
|
|
case 2:
|
|
__put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, d, 2);
|
|
break;
|
|
case 3:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
|
|
break;
|
|
case 4:
|
|
__put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
|
|
break;
|
|
case 5:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
|
|
break;
|
|
case 6:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
|
|
break;
|
|
case 7:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
|
|
break;
|
|
case 8:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
|
|
break;
|
|
case 9:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
|
|
break;
|
|
case 10:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
|
|
break;
|
|
case 12:
|
|
__constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
|
|
break;
|
|
default:
|
|
/* limit the inlined version to 3 moves */
|
|
return __generic_copy_to_user(to, from, n);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
#define __copy_from_user(to, from, n) \
|
|
(__builtin_constant_p(n) ? \
|
|
__constant_copy_from_user(to, from, n) : \
|
|
__generic_copy_from_user(to, from, n))
|
|
|
|
#define __copy_to_user(to, from, n) \
|
|
(__builtin_constant_p(n) ? \
|
|
__constant_copy_to_user(to, from, n) : \
|
|
__generic_copy_to_user(to, 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) __copy_from_user(to, from, n)
|
|
#define copy_to_user(to, from, n) __copy_to_user(to, from, n)
|
|
|
|
long strncpy_from_user(char *dst, const char __user *src, long count);
|
|
long strnlen_user(const char __user *src, long n);
|
|
unsigned long __clear_user(void __user *to, unsigned long n);
|
|
|
|
#define clear_user __clear_user
|
|
|
|
#define strlen_user(str) strnlen_user(str, 32767)
|
|
|
|
#endif /* _M68K_UACCESS_H */
|