mirror of
https://github.com/adulau/aha.git
synced 2024-12-28 11:46:19 +00:00
sh: Provide optimized unaligned loads on SH-4A.
This adds support for unaligned loads on SH-4A, using the SH-4A's neutered movua.l instruction. As movua.l is r0-inspired, stores are still handled through the packed struct. Based on asm-generic/unaligned.h by Harvey Harrison. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
parent
716777db72
commit
95b781c239
2 changed files with 264 additions and 1 deletions
258
arch/sh/include/asm/unaligned-sh4a.h
Normal file
258
arch/sh/include/asm/unaligned-sh4a.h
Normal file
|
|
@ -0,0 +1,258 @@
|
|||
#ifndef __ASM_SH_UNALIGNED_SH4A_H
|
||||
#define __ASM_SH_UNALIGNED_SH4A_H
|
||||
|
||||
/*
|
||||
* SH-4A has support for unaligned 32-bit loads, and 32-bit loads only.
|
||||
* Support for 16 and 64-bit accesses are done through shifting and
|
||||
* masking relative to the endianness. Unaligned stores are not supported
|
||||
* by the instruction encoding, so these continue to use the packed
|
||||
* struct.
|
||||
*
|
||||
* The same note as with the movli.l/movco.l pair applies here, as long
|
||||
* as the load is gauranteed to be inlined, nothing else will hook in to
|
||||
* r0 and we get the return value for free.
|
||||
*
|
||||
* NOTE: Due to the fact we require r0 encoding, care should be taken to
|
||||
* avoid mixing these heavily with other r0 consumers, such as the atomic
|
||||
* ops. Failure to adhere to this can result in the compiler running out
|
||||
* of spill registers and blowing up when building at low optimization
|
||||
* levels. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34777.
|
||||
*/
|
||||
#include <linux/types.h>
|
||||
#include <asm/byteorder.h>
|
||||
|
||||
static __always_inline u32 __get_unaligned_cpu32(const u8 *p)
|
||||
{
|
||||
unsigned long unaligned;
|
||||
|
||||
__asm__ __volatile__ (
|
||||
"movua.l @%1, %0\n\t"
|
||||
: "=z" (unaligned)
|
||||
: "r" (p)
|
||||
);
|
||||
|
||||
return unaligned;
|
||||
}
|
||||
|
||||
struct __una_u16 { u16 x __attribute__((packed)); };
|
||||
struct __una_u32 { u32 x __attribute__((packed)); };
|
||||
struct __una_u64 { u64 x __attribute__((packed)); };
|
||||
|
||||
static inline u16 __get_unaligned_cpu16(const u8 *p)
|
||||
{
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
return __get_unaligned_cpu32(p) & 0xffff;
|
||||
#else
|
||||
return __get_unaligned_cpu32(p) >> 16;
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Even though movua.l supports auto-increment on the read side, it can
|
||||
* only store to r0 due to instruction encoding constraints, so just let
|
||||
* the compiler sort it out on its own.
|
||||
*/
|
||||
static inline u64 __get_unaligned_cpu64(const u8 *p)
|
||||
{
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
return (u64)__get_unaligned_cpu32(p + 4) << 32 |
|
||||
__get_unaligned_cpu32(p);
|
||||
#else
|
||||
return (u64)__get_unaligned_cpu32(p) << 32 |
|
||||
__get_unaligned_cpu32(p + 4);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline u16 get_unaligned_le16(const void *p)
|
||||
{
|
||||
return le16_to_cpu(__get_unaligned_cpu16(p));
|
||||
}
|
||||
|
||||
static inline u32 get_unaligned_le32(const void *p)
|
||||
{
|
||||
return le32_to_cpu(__get_unaligned_cpu32(p));
|
||||
}
|
||||
|
||||
static inline u64 get_unaligned_le64(const void *p)
|
||||
{
|
||||
return le64_to_cpu(__get_unaligned_cpu64(p));
|
||||
}
|
||||
|
||||
static inline u16 get_unaligned_be16(const void *p)
|
||||
{
|
||||
return be16_to_cpu(__get_unaligned_cpu16(p));
|
||||
}
|
||||
|
||||
static inline u32 get_unaligned_be32(const void *p)
|
||||
{
|
||||
return be32_to_cpu(__get_unaligned_cpu32(p));
|
||||
}
|
||||
|
||||
static inline u64 get_unaligned_be64(const void *p)
|
||||
{
|
||||
return be64_to_cpu(__get_unaligned_cpu64(p));
|
||||
}
|
||||
|
||||
static inline void __put_le16_noalign(u8 *p, u16 val)
|
||||
{
|
||||
*p++ = val;
|
||||
*p++ = val >> 8;
|
||||
}
|
||||
|
||||
static inline void __put_le32_noalign(u8 *p, u32 val)
|
||||
{
|
||||
__put_le16_noalign(p, val);
|
||||
__put_le16_noalign(p + 2, val >> 16);
|
||||
}
|
||||
|
||||
static inline void __put_le64_noalign(u8 *p, u64 val)
|
||||
{
|
||||
__put_le32_noalign(p, val);
|
||||
__put_le32_noalign(p + 4, val >> 32);
|
||||
}
|
||||
|
||||
static inline void __put_be16_noalign(u8 *p, u16 val)
|
||||
{
|
||||
*p++ = val >> 8;
|
||||
*p++ = val;
|
||||
}
|
||||
|
||||
static inline void __put_be32_noalign(u8 *p, u32 val)
|
||||
{
|
||||
__put_be16_noalign(p, val >> 16);
|
||||
__put_be16_noalign(p + 2, val);
|
||||
}
|
||||
|
||||
static inline void __put_be64_noalign(u8 *p, u64 val)
|
||||
{
|
||||
__put_be32_noalign(p, val >> 32);
|
||||
__put_be32_noalign(p + 4, val);
|
||||
}
|
||||
|
||||
static inline void put_unaligned_le16(u16 val, void *p)
|
||||
{
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
((struct __una_u16 *)p)->x = val;
|
||||
#else
|
||||
__put_le16_noalign(p, val);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void put_unaligned_le32(u32 val, void *p)
|
||||
{
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
((struct __una_u32 *)p)->x = val;
|
||||
#else
|
||||
__put_le32_noalign(p, val);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void put_unaligned_le64(u64 val, void *p)
|
||||
{
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
((struct __una_u64 *)p)->x = val;
|
||||
#else
|
||||
__put_le64_noalign(p, val);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void put_unaligned_be16(u16 val, void *p)
|
||||
{
|
||||
#ifdef __BIG_ENDIAN
|
||||
((struct __una_u16 *)p)->x = val;
|
||||
#else
|
||||
__put_be16_noalign(p, val);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void put_unaligned_be32(u32 val, void *p)
|
||||
{
|
||||
#ifdef __BIG_ENDIAN
|
||||
((struct __una_u32 *)p)->x = val;
|
||||
#else
|
||||
__put_be32_noalign(p, val);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void put_unaligned_be64(u64 val, void *p)
|
||||
{
|
||||
#ifdef __BIG_ENDIAN
|
||||
((struct __una_u64 *)p)->x = val;
|
||||
#else
|
||||
__put_be64_noalign(p, val);
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Cause a link-time error if we try an unaligned access other than
|
||||
* 1,2,4 or 8 bytes long
|
||||
*/
|
||||
extern void __bad_unaligned_access_size(void);
|
||||
|
||||
#define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({ \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \
|
||||
__bad_unaligned_access_size())))); \
|
||||
}))
|
||||
|
||||
#define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({ \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)), \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)), \
|
||||
__builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)), \
|
||||
__bad_unaligned_access_size())))); \
|
||||
}))
|
||||
|
||||
#define __put_unaligned_le(val, ptr) ({ \
|
||||
void *__gu_p = (ptr); \
|
||||
switch (sizeof(*(ptr))) { \
|
||||
case 1: \
|
||||
*(u8 *)__gu_p = (__force u8)(val); \
|
||||
break; \
|
||||
case 2: \
|
||||
put_unaligned_le16((__force u16)(val), __gu_p); \
|
||||
break; \
|
||||
case 4: \
|
||||
put_unaligned_le32((__force u32)(val), __gu_p); \
|
||||
break; \
|
||||
case 8: \
|
||||
put_unaligned_le64((__force u64)(val), __gu_p); \
|
||||
break; \
|
||||
default: \
|
||||
__bad_unaligned_access_size(); \
|
||||
break; \
|
||||
} \
|
||||
(void)0; })
|
||||
|
||||
#define __put_unaligned_be(val, ptr) ({ \
|
||||
void *__gu_p = (ptr); \
|
||||
switch (sizeof(*(ptr))) { \
|
||||
case 1: \
|
||||
*(u8 *)__gu_p = (__force u8)(val); \
|
||||
break; \
|
||||
case 2: \
|
||||
put_unaligned_be16((__force u16)(val), __gu_p); \
|
||||
break; \
|
||||
case 4: \
|
||||
put_unaligned_be32((__force u32)(val), __gu_p); \
|
||||
break; \
|
||||
case 8: \
|
||||
put_unaligned_be64((__force u64)(val), __gu_p); \
|
||||
break; \
|
||||
default: \
|
||||
__bad_unaligned_access_size(); \
|
||||
break; \
|
||||
} \
|
||||
(void)0; })
|
||||
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
# define get_unaligned __get_unaligned_le
|
||||
# define put_unaligned __put_unaligned_le
|
||||
#else
|
||||
# define get_unaligned __get_unaligned_be
|
||||
# define put_unaligned __put_unaligned_be
|
||||
#endif
|
||||
|
||||
#endif /* __ASM_SH_UNALIGNED_SH4A_H */
|
||||
|
|
@ -1,7 +1,11 @@
|
|||
#ifndef _ASM_SH_UNALIGNED_H
|
||||
#define _ASM_SH_UNALIGNED_H
|
||||
|
||||
/* SH can't handle unaligned accesses. */
|
||||
#ifdef CONFIG_CPU_SH4A
|
||||
/* SH-4A can handle unaligned loads in a relatively neutered fashion. */
|
||||
#include <asm/unaligned-sh4a.h>
|
||||
#else
|
||||
/* Otherwise, SH can't handle unaligned accesses. */
|
||||
#ifdef __LITTLE_ENDIAN__
|
||||
# include <linux/unaligned/le_struct.h>
|
||||
# include <linux/unaligned/be_byteshift.h>
|
||||
|
|
@ -15,5 +19,6 @@
|
|||
# define get_unaligned __get_unaligned_be
|
||||
# define put_unaligned __put_unaligned_be
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#endif /* _ASM_SH_UNALIGNED_H */
|
||||
|
|
|
|||
Loading…
Reference in a new issue