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/*
* 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, 1999, 2000 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#ifndef _ASM_UNALIGNED_H
#define _ASM_UNALIGNED_H
extern void __get_unaligned_bad_length(void);
extern void __put_unaligned_bad_length(void);
/*
* Load double unaligned.
*
* This could have been implemented in plain C like IA64 but egcs 1.0.3a
* inflates this to 23 instructions ...
*/
extern inline unsigned long long __ldq_u(const unsigned long long * __addr)
{
unsigned long long __res;
__asm__("ulw\t%0, %1\n\t"
"ulw\t%D0, 4+%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Load word unaligned.
*/
extern inline unsigned long __ldl_u(const unsigned int * __addr)
{
unsigned long __res;
__asm__("ulw\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Load halfword unaligned.
*/
extern inline unsigned long __ldw_u(const unsigned short * __addr)
{
unsigned long __res;
__asm__("ulh\t%0,%1"
: "=&r" (__res)
: "m" (*__addr));
return __res;
}
/*
* Store doubleword ununaligned.
*/
extern inline void __stq_u(unsigned long __val, unsigned long long * __addr)
{
__asm__("usw\t%1, %0\n\t"
"usw\t%D1, 4+%0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* Store long ununaligned.
*/
extern inline void __stl_u(unsigned long __val, unsigned int * __addr)
{
__asm__("usw\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* Store word ununaligned.
*/
extern inline void __stw_u(unsigned long __val, unsigned short * __addr)
{
__asm__("ush\t%1, %0"
: "=m" (*__addr)
: "r" (__val));
}
/*
* get_unaligned - get value from possibly mis-aligned location
* @ptr: pointer to value
*
* This macro should be used for accessing values larger in size than
* single bytes at locations that are expected to be improperly aligned,
* e.g. retrieving a u16 value from a location not u16-aligned.
*
* Note that unaligned accesses can be very expensive on some architectures.
*/
#define get_unaligned(ptr) \
({ \
__typeof__(*(ptr)) __val; \
\
switch (sizeof(*(ptr))) { \
case 1: \
__val = *(const unsigned char *)ptr; \
break; \
case 2: \
__val = __ldw_u((const unsigned short *)ptr); \
break; \
case 4: \
__val = __ldl_u((const unsigned int *)ptr); \
break; \
case 8: \
__val = __ldq_u((const unsigned long long *)ptr); \
break; \
default: \
__get_unaligned_bad_length(); \
break; \
} \
\
__val; \
})
/*
* put_unaligned - put value to a possibly mis-aligned location
* @val: value to place
* @ptr: pointer to location
*
* This macro should be used for placing values larger in size than
* single bytes at locations that are expected to be improperly aligned,
* e.g. writing a u16 value to a location not u16-aligned.
*
* Note that unaligned accesses can be very expensive on some architectures.
*/
#define put_unaligned(val,ptr) \
do { \
switch (sizeof(*(ptr))) { \
case 1: \
*(unsigned char *)(ptr) = (val); \
break; \
case 2: \
__stw_u(val, (unsigned short *)(ptr)); \
break; \
case 4: \
__stl_u(val, (unsigned int *)(ptr)); \
break; \
case 8: \
__stq_u(val, (unsigned long long *)(ptr)); \
break; \
default: \
__put_unaligned_bad_length(); \
break; \
} \
} while(0)
#endif /* _ASM_UNALIGNED_H */
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