| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 10 Apr 2008 20:38:52 -0700
From: Harvey Harrison <harvey.harrison@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
David Howells <dhowells@...hat.com>,
linux-arch <linux-arch@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 2/2] kernel: Move arches to use common unaligned access
Unaligned access is ok for the following arches:
cris, m68k, mn10300, powerpc, s390, x86
Arches that use the no-builtin-memcpy implementation:
h8300, m32r, xtensa
generic_le:
alpha, blackfin, ia64,
generic_be:
parisc, sparc, sparc64
generic_le or be, choice based on compiler flags:
mips, sh
m86knommu is generic_be for Coldfire, otherwise unaligned access is ok.
frv uses the no_builtin_memcpy implementation when there is an MMU
configured, otherwise uses the generic be byteshifting version.
arm chooses endianness based on compiler settings, uses the byteshifting
versions.
v850 is le, uses the byteshifting versions for both be and le.
Remove the now unused asm-generic implementation.
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
David, this version uses the generic C versions, but if your testing finds the
handrolled frv versions were better as we've been discussing, I will restore them.
include/asm-alpha/unaligned.h | 2 +-
include/asm-arm/unaligned.h | 166 +---------------------------------
include/asm-avr32/unaligned.h | 2 +-
include/asm-blackfin/unaligned.h | 2 +-
include/asm-cris/unaligned.h | 8 +--
include/asm-frv/unaligned.h | 184 ++-----------------------------------
include/asm-generic/unaligned.h | 124 -------------------------
include/asm-h8300/unaligned.h | 11 +--
include/asm-ia64/unaligned.h | 2 +-
include/asm-m32r/unaligned.h | 15 +---
include/asm-m68k/unaligned.h | 9 +--
include/asm-m68knommu/unaligned.h | 10 +--
include/asm-mips/unaligned.h | 29 ++----
include/asm-mn10300/unaligned.h | 126 +-------------------------
include/asm-parisc/unaligned.h | 2 +-
include/asm-powerpc/unaligned.h | 9 +--
include/asm-s390/unaligned.h | 9 +--
include/asm-sh/unaligned.h | 6 +-
include/asm-sparc/unaligned.h | 2 +-
include/asm-sparc64/unaligned.h | 2 +-
include/asm-v850/unaligned.h | 111 +----------------------
include/asm-x86/unaligned.h | 30 +------
include/asm-xtensa/unaligned.h | 12 +--
23 files changed, 48 insertions(+), 825 deletions(-)
diff --git a/include/asm-alpha/unaligned.h b/include/asm-alpha/unaligned.h
index a1d7284..18acc19 100644
--- a/include/asm-alpha/unaligned.h
+++ b/include/asm-alpha/unaligned.h
@@ -1,6 +1,6 @@
#ifndef __ALPHA_UNALIGNED_H
#define __ALPHA_UNALIGNED_H
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_le.h>
#endif
diff --git a/include/asm-arm/unaligned.h b/include/asm-arm/unaligned.h
index 5db03cf..d5cf478 100644
--- a/include/asm-arm/unaligned.h
+++ b/include/asm-arm/unaligned.h
@@ -1,171 +1,7 @@
#ifndef __ASM_ARM_UNALIGNED_H
#define __ASM_ARM_UNALIGNED_H
-#include <asm/types.h>
-
-extern int __bug_unaligned_x(const void *ptr);
-
-/*
- * What is the most efficient way of loading/storing an unaligned value?
- *
- * That is the subject of this file. Efficiency here is defined as
- * minimum code size with minimum register usage for the common cases.
- * It is currently not believed that long longs are common, so we
- * trade efficiency for the chars, shorts and longs against the long
- * longs.
- *
- * Current stats with gcc 2.7.2.2 for these functions:
- *
- * ptrsize get: code regs put: code regs
- * 1 1 1 1 2
- * 2 3 2 3 2
- * 4 7 3 7 3
- * 8 20 6 16 6
- *
- * gcc 2.95.1 seems to code differently:
- *
- * ptrsize get: code regs put: code regs
- * 1 1 1 1 2
- * 2 3 2 3 2
- * 4 7 4 7 4
- * 8 19 8 15 6
- *
- * which may or may not be more efficient (depending upon whether
- * you can afford the extra registers). Hopefully the gcc 2.95
- * is inteligent enough to decide if it is better to use the
- * extra register, but evidence so far seems to suggest otherwise.
- *
- * Unfortunately, gcc is not able to optimise the high word
- * out of long long >> 32, or the low word from long long << 32
- */
-
-#define __get_unaligned_2_le(__p) \
- (unsigned int)(__p[0] | __p[1] << 8)
-
-#define __get_unaligned_2_be(__p) \
- (unsigned int)(__p[0] << 8 | __p[1])
-
-#define __get_unaligned_4_le(__p) \
- (unsigned int)(__p[0] | __p[1] << 8 | __p[2] << 16 | __p[3] << 24)
-
-#define __get_unaligned_4_be(__p) \
- (unsigned int)(__p[0] << 24 | __p[1] << 16 | __p[2] << 8 | __p[3])
-
-#define __get_unaligned_8_le(__p) \
- ((unsigned long long)__get_unaligned_4_le((__p+4)) << 32 | \
- __get_unaligned_4_le(__p))
-
-#define __get_unaligned_8_be(__p) \
- ((unsigned long long)__get_unaligned_4_be(__p) << 32 | \
- __get_unaligned_4_be((__p+4)))
-
-#define __get_unaligned_le(ptr) \
- ((__force typeof(*(ptr)))({ \
- const __u8 *__p = (const __u8 *)(ptr); \
- __builtin_choose_expr(sizeof(*(ptr)) == 1, *__p, \
- __builtin_choose_expr(sizeof(*(ptr)) == 2, __get_unaligned_2_le(__p), \
- __builtin_choose_expr(sizeof(*(ptr)) == 4, __get_unaligned_4_le(__p), \
- __builtin_choose_expr(sizeof(*(ptr)) == 8, __get_unaligned_8_le(__p), \
- (void)__bug_unaligned_x(__p))))); \
- }))
-
-#define __get_unaligned_be(ptr) \
- ((__force typeof(*(ptr)))({ \
- const __u8 *__p = (const __u8 *)(ptr); \
- __builtin_choose_expr(sizeof(*(ptr)) == 1, *__p, \
- __builtin_choose_expr(sizeof(*(ptr)) == 2, __get_unaligned_2_be(__p), \
- __builtin_choose_expr(sizeof(*(ptr)) == 4, __get_unaligned_4_be(__p), \
- __builtin_choose_expr(sizeof(*(ptr)) == 8, __get_unaligned_8_be(__p), \
- (void)__bug_unaligned_x(__p))))); \
- }))
-
-
-static inline void __put_unaligned_2_le(__u32 __v, register __u8 *__p)
-{
- *__p++ = __v;
- *__p++ = __v >> 8;
-}
-
-static inline void __put_unaligned_2_be(__u32 __v, register __u8 *__p)
-{
- *__p++ = __v >> 8;
- *__p++ = __v;
-}
-
-static inline void __put_unaligned_4_le(__u32 __v, register __u8 *__p)
-{
- __put_unaligned_2_le(__v >> 16, __p + 2);
- __put_unaligned_2_le(__v, __p);
-}
-
-static inline void __put_unaligned_4_be(__u32 __v, register __u8 *__p)
-{
- __put_unaligned_2_be(__v >> 16, __p);
- __put_unaligned_2_be(__v, __p + 2);
-}
-
-static inline void __put_unaligned_8_le(const unsigned long long __v, register __u8 *__p)
-{
- /*
- * tradeoff: 8 bytes of stack for all unaligned puts (2
- * instructions), or an extra register in the long long
- * case - go for the extra register.
- */
- __put_unaligned_4_le(__v >> 32, __p+4);
- __put_unaligned_4_le(__v, __p);
-}
-
-static inline void __put_unaligned_8_be(const unsigned long long __v, register __u8 *__p)
-{
- /*
- * tradeoff: 8 bytes of stack for all unaligned puts (2
- * instructions), or an extra register in the long long
- * case - go for the extra register.
- */
- __put_unaligned_4_be(__v >> 32, __p);
- __put_unaligned_4_be(__v, __p+4);
-}
-
-/*
- * Try to store an unaligned value as efficiently as possible.
- */
-#define __put_unaligned_le(val,ptr) \
- ({ \
- (void)sizeof(*(ptr) = (val)); \
- switch (sizeof(*(ptr))) { \
- case 1: \
- *(ptr) = (val); \
- break; \
- case 2: __put_unaligned_2_le((__force u16)(val),(__u8 *)(ptr)); \
- break; \
- case 4: __put_unaligned_4_le((__force u32)(val),(__u8 *)(ptr)); \
- break; \
- case 8: __put_unaligned_8_le((__force u64)(val),(__u8 *)(ptr)); \
- break; \
- default: __bug_unaligned_x(ptr); \
- break; \
- } \
- (void) 0; \
- })
-
-#define __put_unaligned_be(val,ptr) \
- ({ \
- (void)sizeof(*(ptr) = (val)); \
- switch (sizeof(*(ptr))) { \
- case 1: \
- *(ptr) = (val); \
- break; \
- case 2: __put_unaligned_2_be((__force u16)(val),(__u8 *)(ptr)); \
- break; \
- case 4: __put_unaligned_4_be((__force u32)(val),(__u8 *)(ptr)); \
- break; \
- case 8: __put_unaligned_8_be((__force u64)(val),(__u8 *)(ptr)); \
- break; \
- default: __bug_unaligned_x(ptr); \
- break; \
- } \
- (void) 0; \
- })
+#include <linux/unaligned/generic.h>
/*
* Select endianness
diff --git a/include/asm-avr32/unaligned.h b/include/asm-avr32/unaligned.h
index 36f5fd4..28fa20e 100644
--- a/include/asm-avr32/unaligned.h
+++ b/include/asm-avr32/unaligned.h
@@ -11,6 +11,6 @@
* optimize word loads in general.
*/
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_be.h>
#endif /* __ASM_AVR32_UNALIGNED_H */
diff --git a/include/asm-blackfin/unaligned.h b/include/asm-blackfin/unaligned.h
index 10081dc..25861cd 100644
--- a/include/asm-blackfin/unaligned.h
+++ b/include/asm-blackfin/unaligned.h
@@ -1,6 +1,6 @@
#ifndef __BFIN_UNALIGNED_H
#define __BFIN_UNALIGNED_H
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_le.h>
#endif /* __BFIN_UNALIGNED_H */
diff --git a/include/asm-cris/unaligned.h b/include/asm-cris/unaligned.h
index 7fbbb39..8bd3555 100644
--- a/include/asm-cris/unaligned.h
+++ b/include/asm-cris/unaligned.h
@@ -3,14 +3,8 @@
/*
* CRIS can do unaligned accesses itself.
- *
- * The strange macros are there to make sure these can't
- * be misused in a way that makes them not work on other
- * architectures where unaligned accesses aren't as simple.
*/
-#define get_unaligned(ptr) (*(ptr))
-
-#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
+#include <linux/unaligned/access_ok.h>
#endif
diff --git a/include/asm-frv/unaligned.h b/include/asm-frv/unaligned.h
index dc8e9c9..ff01156 100644
--- a/include/asm-frv/unaligned.h
+++ b/include/asm-frv/unaligned.h
@@ -9,9 +9,8 @@
* 2 of the License, or (at your option) any later version.
*/
-#ifndef _ASM_UNALIGNED_H
-#define _ASM_UNALIGNED_H
-
+#ifndef _ASM_FRV_UNALIGNED_H_
+#define _ASM_FRV_UNALIGNED_H_
/*
* Unaligned accesses on uClinux can't be performed in a fault handler - the
@@ -19,184 +18,19 @@
*
* With the FR451, however, they are precise, and so we used to fix them up in
* the memory access fault handler. However, instruction bundling make this
- * impractical. So, now we fall back to using memcpy.
+ * impractical. So, now we fall back to using memmov.
*/
#ifdef CONFIG_MMU
-/*
- * The asm statement in the macros below is a way to get GCC to copy a
- * value from one variable to another without having any clue it's
- * actually doing so, so that it won't have any idea that the values
- * in the two variables are related.
- */
-
-#define get_unaligned(ptr) ({ \
- typeof((*(ptr))) __x; \
- void *__ptrcopy; \
- asm("" : "=r" (__ptrcopy) : "0" (ptr)); \
- memcpy(&__x, __ptrcopy, sizeof(*(ptr))); \
- __x; \
-})
-
-#define put_unaligned(val, ptr) ({ \
- typeof((*(ptr))) __x = (val); \
- void *__ptrcopy; \
- asm("" : "=r" (__ptrcopy) : "0" (ptr)); \
- memcpy(__ptrcopy, &__x, sizeof(*(ptr))); \
-})
-
+#include <linux/unaligned/no_builtin_memcpy.h>
extern int handle_misalignment(unsigned long esr0, unsigned long ear0, unsigned long epcr0);
#else
-#define get_unaligned(ptr) \
-({ \
- typeof(*(ptr)) x; \
- const char *__p = (const char *) (ptr); \
- \
- switch (sizeof(x)) { \
- case 1: \
- x = *(ptr); \
- break; \
- case 2: \
- { \
- uint8_t a; \
- asm(" ldub%I2 %M2,%0 \n" \
- " ldub%I3.p %M3,%1 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%1,%0 \n" \
- : "=&r"(x), "=&r"(a) \
- : "m"(__p[0]), "m"(__p[1]) \
- ); \
- break; \
- } \
- \
- case 4: \
- { \
- uint8_t a; \
- asm(" ldub%I2 %M2,%0 \n" \
- " ldub%I3.p %M3,%1 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%1,%0 \n" \
- " ldub%I4.p %M4,%1 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%1,%0 \n" \
- " ldub%I5.p %M5,%1 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%1,%0 \n" \
- : "=&r"(x), "=&r"(a) \
- : "m"(__p[0]), "m"(__p[1]), "m"(__p[2]), "m"(__p[3]) \
- ); \
- break; \
- } \
- \
- case 8: \
- { \
- union { uint64_t x; u32 y[2]; } z; \
- uint8_t a; \
- asm(" ldub%I3 %M3,%0 \n" \
- " ldub%I4.p %M4,%2 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%2,%0 \n" \
- " ldub%I5.p %M5,%2 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%2,%0 \n" \
- " ldub%I6.p %M6,%2 \n" \
- " slli %0,#8,%0 \n" \
- " or %0,%2,%0 \n" \
- " ldub%I7 %M7,%1 \n" \
- " ldub%I8.p %M8,%2 \n" \
- " slli %1,#8,%1 \n" \
- " or %1,%2,%1 \n" \
- " ldub%I9.p %M9,%2 \n" \
- " slli %1,#8,%1 \n" \
- " or %1,%2,%1 \n" \
- " ldub%I10.p %M10,%2 \n" \
- " slli %1,#8,%1 \n" \
- " or %1,%2,%1 \n" \
- : "=&r"(z.y[0]), "=&r"(z.y[1]), "=&r"(a) \
- : "m"(__p[0]), "m"(__p[1]), "m"(__p[2]), "m"(__p[3]), \
- "m"(__p[4]), "m"(__p[5]), "m"(__p[6]), "m"(__p[7]) \
- ); \
- x = z.x; \
- break; \
- } \
- \
- default: \
- x = 0; \
- BUG(); \
- break; \
- } \
- \
- x; \
-})
-
-#define put_unaligned(val, ptr) \
-do { \
- char *__p = (char *) (ptr); \
- int x; \
- \
- switch (sizeof(*ptr)) { \
- case 2: \
- { \
- asm(" stb%I1.p %0,%M1 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I2 %0,%M2 \n" \
- : "=r"(x), "=m"(__p[1]), "=m"(__p[0]) \
- : "0"(val) \
- ); \
- break; \
- } \
- \
- case 4: \
- { \
- asm(" stb%I1.p %0,%M1 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I2.p %0,%M2 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I3.p %0,%M3 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I4 %0,%M4 \n" \
- : "=r"(x), "=m"(__p[3]), "=m"(__p[2]), "=m"(__p[1]), "=m"(__p[0]) \
- : "0"(val) \
- ); \
- break; \
- } \
- \
- case 8: \
- { \
- uint32_t __high, __low; \
- __high = (uint64_t)val >> 32; \
- __low = val & 0xffffffff; \
- asm(" stb%I2.p %0,%M2 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I3.p %0,%M3 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I4.p %0,%M4 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I5.p %0,%M5 \n" \
- " srli %0,#8,%0 \n" \
- " stb%I6.p %1,%M6 \n" \
- " srli %1,#8,%1 \n" \
- " stb%I7.p %1,%M7 \n" \
- " srli %1,#8,%1 \n" \
- " stb%I8.p %1,%M8 \n" \
- " srli %1,#8,%1 \n" \
- " stb%I9 %1,%M9 \n" \
- : "=&r"(__low), "=&r"(__high), "=m"(__p[7]), "=m"(__p[6]), \
- "=m"(__p[5]), "=m"(__p[4]), "=m"(__p[3]), "=m"(__p[2]), \
- "=m"(__p[1]), "=m"(__p[0]) \
- : "0"(__low), "1"(__high) \
- ); \
- break; \
- } \
- \
- default: \
- *(ptr) = (val); \
- break; \
- } \
-} while(0)
+#include <linux/unaligned/generic.h>
+#define get_unaligned __get_unaligned_be
+#define put_unaligned __put_unaligned_be
-#endif
+#endif /* CONFIG_MMU */
-#endif
+#endif /* _ASM_FRV_UNALIGNED_H_ */
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
deleted file mode 100644
index 2fe1b2e..0000000
--- a/include/asm-generic/unaligned.h
+++ /dev/null
@@ -1,124 +0,0 @@
-#ifndef _ASM_GENERIC_UNALIGNED_H_
-#define _ASM_GENERIC_UNALIGNED_H_
-
-/*
- * For the benefit of those who are trying to port Linux to another
- * architecture, here are some C-language equivalents.
- *
- * This is based almost entirely upon Richard Henderson's
- * asm-alpha/unaligned.h implementation. Some comments were
- * taken from David Mosberger's asm-ia64/unaligned.h header.
- */
-
-#include <linux/types.h>
-
-/*
- * The main single-value unaligned transfer routines.
- */
-#define get_unaligned(ptr) \
- __get_unaligned((ptr), sizeof(*(ptr)))
-#define put_unaligned(x,ptr) \
- ((void)sizeof(*(ptr)=(x)),\
- __put_unaligned((__force __u64)(x), (ptr), sizeof(*(ptr))))
-
-/*
- * This function doesn't actually exist. The idea is that when
- * someone uses the macros below with an unsupported size (datatype),
- * the linker will alert us to the problem via an unresolved reference
- * error.
- */
-extern void bad_unaligned_access_length(void) __attribute__((noreturn));
-
-struct __una_u64 { __u64 x __attribute__((packed)); };
-struct __una_u32 { __u32 x __attribute__((packed)); };
-struct __una_u16 { __u16 x __attribute__((packed)); };
-
-/*
- * Elemental unaligned loads
- */
-
-static inline __u64 __uldq(const __u64 *addr)
-{
- const struct __una_u64 *ptr = (const struct __una_u64 *) addr;
- return ptr->x;
-}
-
-static inline __u32 __uldl(const __u32 *addr)
-{
- const struct __una_u32 *ptr = (const struct __una_u32 *) addr;
- return ptr->x;
-}
-
-static inline __u16 __uldw(const __u16 *addr)
-{
- const struct __una_u16 *ptr = (const struct __una_u16 *) addr;
- return ptr->x;
-}
-
-/*
- * Elemental unaligned stores
- */
-
-static inline void __ustq(__u64 val, __u64 *addr)
-{
- struct __una_u64 *ptr = (struct __una_u64 *) addr;
- ptr->x = val;
-}
-
-static inline void __ustl(__u32 val, __u32 *addr)
-{
- struct __una_u32 *ptr = (struct __una_u32 *) addr;
- ptr->x = val;
-}
-
-static inline void __ustw(__u16 val, __u16 *addr)
-{
- struct __una_u16 *ptr = (struct __una_u16 *) addr;
- ptr->x = val;
-}
-
-#define __get_unaligned(ptr, size) ({ \
- const void *__gu_p = ptr; \
- __u64 __val; \
- switch (size) { \
- case 1: \
- __val = *(const __u8 *)__gu_p; \
- break; \
- case 2: \
- __val = __uldw(__gu_p); \
- break; \
- case 4: \
- __val = __uldl(__gu_p); \
- break; \
- case 8: \
- __val = __uldq(__gu_p); \
- break; \
- default: \
- bad_unaligned_access_length(); \
- }; \
- (__force __typeof__(*(ptr)))__val; \
-})
-
-#define __put_unaligned(val, ptr, size) \
-({ \
- void *__gu_p = ptr; \
- switch (size) { \
- case 1: \
- *(__u8 *)__gu_p = (__force __u8)val; \
- break; \
- case 2: \
- __ustw((__force __u16)val, __gu_p); \
- break; \
- case 4: \
- __ustl((__force __u32)val, __gu_p); \
- break; \
- case 8: \
- __ustq(val, __gu_p); \
- break; \
- default: \
- bad_unaligned_access_length(); \
- }; \
- (void)0; \
-})
-
-#endif /* _ASM_GENERIC_UNALIGNED_H */
diff --git a/include/asm-h8300/unaligned.h b/include/asm-h8300/unaligned.h
index ffb67f4..e8ff49d 100644
--- a/include/asm-h8300/unaligned.h
+++ b/include/asm-h8300/unaligned.h
@@ -1,15 +1,6 @@
#ifndef __H8300_UNALIGNED_H
#define __H8300_UNALIGNED_H
-
-/* Use memmove here, so gcc does not insert a __builtin_memcpy. */
-
-#define get_unaligned(ptr) \
- ({ __typeof__(*(ptr)) __tmp; memmove(&__tmp, (ptr), sizeof(*(ptr))); __tmp; })
-
-#define put_unaligned(val, ptr) \
- ({ __typeof__(*(ptr)) __tmp = (val); \
- memmove((ptr), &__tmp, sizeof(*(ptr))); \
- (void)0; })
+#include <linux/unaligned/no_builtin_memcpy.h>
#endif
diff --git a/include/asm-ia64/unaligned.h b/include/asm-ia64/unaligned.h
index bb85598..2134205 100644
--- a/include/asm-ia64/unaligned.h
+++ b/include/asm-ia64/unaligned.h
@@ -1,6 +1,6 @@
#ifndef _ASM_IA64_UNALIGNED_H
#define _ASM_IA64_UNALIGNED_H
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_le.h>
#endif /* _ASM_IA64_UNALIGNED_H */
diff --git a/include/asm-m32r/unaligned.h b/include/asm-m32r/unaligned.h
index fccc180..5a4c931 100644
--- a/include/asm-m32r/unaligned.h
+++ b/include/asm-m32r/unaligned.h
@@ -1,19 +1,6 @@
#ifndef _ASM_M32R_UNALIGNED_H
#define _ASM_M32R_UNALIGNED_H
-/*
- * For the benefit of those who are trying to port Linux to another
- * architecture, here are some C-language equivalents.
- */
-
-#include <asm/string.h>
-
-#define get_unaligned(ptr) \
- ({ __typeof__(*(ptr)) __tmp; memmove(&__tmp, (ptr), sizeof(*(ptr))); __tmp; })
-
-#define put_unaligned(val, ptr) \
- ({ __typeof__(*(ptr)) __tmp = (val); \
- memmove((ptr), &__tmp, sizeof(*(ptr))); \
- (void)0; })
+#include <linux/unaligned/no_builtin_memcpy.h>
#endif /* _ASM_M32R_UNALIGNED_H */
diff --git a/include/asm-m68k/unaligned.h b/include/asm-m68k/unaligned.h
index 804cb3f..94b4a77 100644
--- a/include/asm-m68k/unaligned.h
+++ b/include/asm-m68k/unaligned.h
@@ -3,14 +3,7 @@
/*
* The m68k can do unaligned accesses itself.
- *
- * The strange macros are there to make sure these can't
- * be misused in a way that makes them not work on other
- * architectures where unaligned accesses aren't as simple.
*/
-
-#define get_unaligned(ptr) (*(ptr))
-
-#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
+#include <linux/unaligned/access_ok.h>
#endif
diff --git a/include/asm-m68knommu/unaligned.h b/include/asm-m68knommu/unaligned.h
index 869e9dd..6b5c7a2 100644
--- a/include/asm-m68knommu/unaligned.h
+++ b/include/asm-m68knommu/unaligned.h
@@ -4,19 +4,13 @@
#ifdef CONFIG_COLDFIRE
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_be.h>
#else
/*
* The m68k can do unaligned accesses itself.
- *
- * The strange macros are there to make sure these can't
- * be misused in a way that makes them not work on other
- * architectures where unaligned accesses aren't as simple.
*/
-
-#define get_unaligned(ptr) (*(ptr))
-#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
+#include <linux/unaligned/access_ok.h>
#endif
diff --git a/include/asm-mips/unaligned.h b/include/asm-mips/unaligned.h
index 3249049..471e127 100644
--- a/include/asm-mips/unaligned.h
+++ b/include/asm-mips/unaligned.h
@@ -5,25 +5,16 @@
*
* Copyright (C) 2007 Ralf Baechle (ralf@...ux-mips.org)
*/
-#ifndef __ASM_GENERIC_UNALIGNED_H
-#define __ASM_GENERIC_UNALIGNED_H
+#ifndef __ASM_MIPS_UNALIGNED_H
+#define __ASM_MIPS_UNALIGNED_H
#include <linux/compiler.h>
+#if defined(__MIPSEB__)
+# include <linux/unaligned/generic_be.h>
+#elif defined(__MIPSEL__)
+# include <linux/unaligned/generic_le.h>
+#else
+# error "MIPS, but neither __MIPSEB__, nor __MIPSEL__???"
+#endif
-#define get_unaligned(ptr) \
-({ \
- struct __packed { \
- typeof(*(ptr)) __v; \
- } *__p = (void *) (ptr); \
- __p->__v; \
-})
-
-#define put_unaligned(val, ptr) \
-do { \
- struct __packed { \
- typeof(*(ptr)) __v; \
- } *__p = (void *) (ptr); \
- __p->__v = (val); \
-} while(0)
-
-#endif /* __ASM_GENERIC_UNALIGNED_H */
+#endif /* __ASM_MIPS_UNALIGNED_H */
diff --git a/include/asm-mn10300/unaligned.h b/include/asm-mn10300/unaligned.h
index cad3afb..c377ba0 100644
--- a/include/asm-mn10300/unaligned.h
+++ b/include/asm-mn10300/unaligned.h
@@ -8,129 +8,9 @@
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
-#ifndef _ASM_UNALIGNED_H
-#define _ASM_UNALIGNED_H
+#ifndef _ASM_MN10300_UNALIGNED_H
+#define _ASM_MN10300_UNALIGNED_H
-#include <asm/types.h>
-
-#if 0
-extern int __bug_unaligned_x(void *ptr);
-
-/*
- * What is the most efficient way of loading/storing an unaligned value?
- *
- * That is the subject of this file. Efficiency here is defined as
- * minimum code size with minimum register usage for the common cases.
- * It is currently not believed that long longs are common, so we
- * trade efficiency for the chars, shorts and longs against the long
- * longs.
- *
- * Current stats with gcc 2.7.2.2 for these functions:
- *
- * ptrsize get: code regs put: code regs
- * 1 1 1 1 2
- * 2 3 2 3 2
- * 4 7 3 7 3
- * 8 20 6 16 6
- *
- * gcc 2.95.1 seems to code differently:
- *
- * ptrsize get: code regs put: code regs
- * 1 1 1 1 2
- * 2 3 2 3 2
- * 4 7 4 7 4
- * 8 19 8 15 6
- *
- * which may or may not be more efficient (depending upon whether
- * you can afford the extra registers). Hopefully the gcc 2.95
- * is inteligent enough to decide if it is better to use the
- * extra register, but evidence so far seems to suggest otherwise.
- *
- * Unfortunately, gcc is not able to optimise the high word
- * out of long long >> 32, or the low word from long long << 32
- */
-
-#define __get_unaligned_2(__p) \
- (__p[0] | __p[1] << 8)
-
-#define __get_unaligned_4(__p) \
- (__p[0] | __p[1] << 8 | __p[2] << 16 | __p[3] << 24)
-
-#define get_unaligned(ptr) \
-({ \
- unsigned int __v1, __v2; \
- __typeof__(*(ptr)) __v; \
- __u8 *__p = (__u8 *)(ptr); \
- \
- switch (sizeof(*(ptr))) { \
- case 1: __v = *(ptr); break; \
- case 2: __v = __get_unaligned_2(__p); break; \
- case 4: __v = __get_unaligned_4(__p); break; \
- case 8: \
- __v2 = __get_unaligned_4((__p+4)); \
- __v1 = __get_unaligned_4(__p); \
- __v = ((unsigned long long)__v2 << 32 | __v1); \
- break; \
- default: __v = __bug_unaligned_x(__p); break; \
- } \
- __v; \
-})
-
-
-static inline void __put_unaligned_2(__u32 __v, register __u8 *__p)
-{
- *__p++ = __v;
- *__p++ = __v >> 8;
-}
-
-static inline void __put_unaligned_4(__u32 __v, register __u8 *__p)
-{
- __put_unaligned_2(__v >> 16, __p + 2);
- __put_unaligned_2(__v, __p);
-}
-
-static inline void __put_unaligned_8(const unsigned long long __v, __u8 *__p)
-{
- /*
- * tradeoff: 8 bytes of stack for all unaligned puts (2
- * instructions), or an extra register in the long long
- * case - go for the extra register.
- */
- __put_unaligned_4(__v >> 32, __p + 4);
- __put_unaligned_4(__v, __p);
-}
-
-/*
- * Try to store an unaligned value as efficiently as possible.
- */
-#define put_unaligned(val, ptr) \
- ({ \
- switch (sizeof(*(ptr))) { \
- case 1: \
- *(ptr) = (val); \
- break; \
- case 2: \
- __put_unaligned_2((val), (__u8 *)(ptr)); \
- break; \
- case 4: \
- __put_unaligned_4((val), (__u8 *)(ptr)); \
- break; \
- case 8: \
- __put_unaligned_8((val), (__u8 *)(ptr)); \
- break; \
- default: \
- __bug_unaligned_x(ptr); \
- break; \
- } \
- (void) 0; \
- })
-
-
-#else
-
-#define get_unaligned(ptr) (*(ptr))
-#define put_unaligned(val, ptr) ({ *(ptr) = (val); (void) 0; })
-
-#endif
+#include <linux/unaligned/access_ok.h>
#endif
diff --git a/include/asm-parisc/unaligned.h b/include/asm-parisc/unaligned.h
index 53c9058..865867c 100644
--- a/include/asm-parisc/unaligned.h
+++ b/include/asm-parisc/unaligned.h
@@ -1,7 +1,7 @@
#ifndef _ASM_PARISC_UNALIGNED_H_
#define _ASM_PARISC_UNALIGNED_H_
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_be.h>
#ifdef __KERNEL__
struct pt_regs;
diff --git a/include/asm-powerpc/unaligned.h b/include/asm-powerpc/unaligned.h
index 6c95dfa..59bcc21 100644
--- a/include/asm-powerpc/unaligned.h
+++ b/include/asm-powerpc/unaligned.h
@@ -5,15 +5,8 @@
/*
* The PowerPC can do unaligned accesses itself in big endian mode.
- *
- * The strange macros are there to make sure these can't
- * be misused in a way that makes them not work on other
- * architectures where unaligned accesses aren't as simple.
*/
-
-#define get_unaligned(ptr) (*(ptr))
-
-#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
+#include <linux/unaligned/access_ok.h>
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_UNALIGNED_H */
diff --git a/include/asm-s390/unaligned.h b/include/asm-s390/unaligned.h
index 8ee86db..1d4a684 100644
--- a/include/asm-s390/unaligned.h
+++ b/include/asm-s390/unaligned.h
@@ -11,14 +11,7 @@
/*
* The S390 can do unaligned accesses itself.
- *
- * The strange macros are there to make sure these can't
- * be misused in a way that makes them not work on other
- * architectures where unaligned accesses aren't as simple.
*/
-
-#define get_unaligned(ptr) (*(ptr))
-
-#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
+#include <linux/unaligned/access_ok.h>
#endif
diff --git a/include/asm-sh/unaligned.h b/include/asm-sh/unaligned.h
index 5250e30..391da8d 100644
--- a/include/asm-sh/unaligned.h
+++ b/include/asm-sh/unaligned.h
@@ -2,6 +2,10 @@
#define __ASM_SH_UNALIGNED_H
/* SH can't handle unaligned accesses. */
-#include <asm-generic/unaligned.h>
+#ifdef __LITTLE_ENDIAN__
+#include <linux/unaligned/generic_le.h>
+#else
+#include <linux/unaligned/generic_be.h>
+#endif
#endif /* __ASM_SH_UNALIGNED_H */
diff --git a/include/asm-sparc/unaligned.h b/include/asm-sparc/unaligned.h
index b6f8edd..9f1bb56 100644
--- a/include/asm-sparc/unaligned.h
+++ b/include/asm-sparc/unaligned.h
@@ -1,6 +1,6 @@
#ifndef _ASM_SPARC_UNALIGNED_H_
#define _ASM_SPARC_UNALIGNED_H_
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_be.h>
#endif /* _ASM_SPARC_UNALIGNED_H */
diff --git a/include/asm-sparc64/unaligned.h b/include/asm-sparc64/unaligned.h
index 1ed3ba5..faa18cd 100644
--- a/include/asm-sparc64/unaligned.h
+++ b/include/asm-sparc64/unaligned.h
@@ -1,6 +1,6 @@
#ifndef _ASM_SPARC64_UNALIGNED_H_
#define _ASM_SPARC64_UNALIGNED_H_
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/generic_be.h>
#endif /* _ASM_SPARC64_UNALIGNED_H */
diff --git a/include/asm-v850/unaligned.h b/include/asm-v850/unaligned.h
index e30b186..09fc37c 100644
--- a/include/asm-v850/unaligned.h
+++ b/include/asm-v850/unaligned.h
@@ -17,114 +17,9 @@
#ifndef __V850_UNALIGNED_H__
#define __V850_UNALIGNED_H__
-#include <asm/types.h>
-
-extern int __bug_unaligned_x(void *ptr);
-
-/*
- * What is the most efficient way of loading/storing an unaligned value?
- *
- * That is the subject of this file. Efficiency here is defined as
- * minimum code size with minimum register usage for the common cases.
- * It is currently not believed that long longs are common, so we
- * trade efficiency for the chars, shorts and longs against the long
- * longs.
- *
- * Current stats with gcc 2.7.2.2 for these functions:
- *
- * ptrsize get: code regs put: code regs
- * 1 1 1 1 2
- * 2 3 2 3 2
- * 4 7 3 7 3
- * 8 20 6 16 6
- *
- * gcc 2.95.1 seems to code differently:
- *
- * ptrsize get: code regs put: code regs
- * 1 1 1 1 2
- * 2 3 2 3 2
- * 4 7 4 7 4
- * 8 19 8 15 6
- *
- * which may or may not be more efficient (depending upon whether
- * you can afford the extra registers). Hopefully the gcc 2.95
- * is inteligent enough to decide if it is better to use the
- * extra register, but evidence so far seems to suggest otherwise.
- *
- * Unfortunately, gcc is not able to optimise the high word
- * out of long long >> 32, or the low word from long long << 32
- */
-
-#define __get_unaligned_2(__p) \
- (__p[0] | __p[1] << 8)
-
-#define __get_unaligned_4(__p) \
- (__p[0] | __p[1] << 8 | __p[2] << 16 | __p[3] << 24)
-
-#define get_unaligned(ptr) \
- ({ \
- __typeof__(*(ptr)) __v; \
- __u8 *__p = (__u8 *)(ptr); \
- switch (sizeof(*(ptr))) { \
- case 1: __v = *(ptr); break; \
- case 2: __v = __get_unaligned_2(__p); break; \
- case 4: __v = __get_unaligned_4(__p); break; \
- case 8: { \
- unsigned int __v1, __v2; \
- __v2 = __get_unaligned_4((__p+4)); \
- __v1 = __get_unaligned_4(__p); \
- __v = ((unsigned long long)__v2 << 32 | __v1); \
- } \
- break; \
- default: __v = __bug_unaligned_x(__p); break; \
- } \
- __v; \
- })
-
-
-static inline void __put_unaligned_2(__u32 __v, register __u8 *__p)
-{
- *__p++ = __v;
- *__p++ = __v >> 8;
-}
-
-static inline void __put_unaligned_4(__u32 __v, register __u8 *__p)
-{
- __put_unaligned_2(__v >> 16, __p + 2);
- __put_unaligned_2(__v, __p);
-}
-
-static inline void __put_unaligned_8(const unsigned long long __v, register __u8 *__p)
-{
- /*
- * tradeoff: 8 bytes of stack for all unaligned puts (2
- * instructions), or an extra register in the long long
- * case - go for the extra register.
- */
- __put_unaligned_4(__v >> 32, __p+4);
- __put_unaligned_4(__v, __p);
-}
-
-/*
- * Try to store an unaligned value as efficiently as possible.
- */
-#define put_unaligned(val,ptr) \
- ({ \
- switch (sizeof(*(ptr))) { \
- case 1: \
- *(ptr) = (val); \
- break; \
- case 2: __put_unaligned_2((val),(__u8 *)(ptr)); \
- break; \
- case 4: __put_unaligned_4((val),(__u8 *)(ptr)); \
- break; \
- case 8: __put_unaligned_8((val),(__u8 *)(ptr)); \
- break; \
- default: __bug_unaligned_x(ptr); \
- break; \
- } \
- (void) 0; \
- })
+#include <linux/unaligned/generic.h>
+#define get_unaligned __get_unaligned_le
+#define put_unaligned __put_unaligned_le
#endif /* __V850_UNALIGNED_H__ */
diff --git a/include/asm-x86/unaligned.h b/include/asm-x86/unaligned.h
index 913598d..7ba2e1a 100644
--- a/include/asm-x86/unaligned.h
+++ b/include/asm-x86/unaligned.h
@@ -3,35 +3,7 @@
/*
* The x86 can do unaligned accesses itself.
- *
- * The strange macros are there to make sure these can't
- * be misused in a way that makes them not work on other
- * architectures where unaligned accesses aren't as simple.
*/
-
-/**
- * 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) (*(ptr))
-
-/**
- * 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) ((void)( *(ptr) = (val) ))
+#include <linux/unaligned/access_ok.h>
#endif /* _ASM_X86_UNALIGNED_H */
diff --git a/include/asm-xtensa/unaligned.h b/include/asm-xtensa/unaligned.h
index 2822089..45eb203 100644
--- a/include/asm-xtensa/unaligned.h
+++ b/include/asm-xtensa/unaligned.h
@@ -13,16 +13,6 @@
#ifndef _XTENSA_UNALIGNED_H
#define _XTENSA_UNALIGNED_H
-#include <linux/string.h>
-
-/* Use memmove here, so gcc does not insert a __builtin_memcpy. */
-
-#define get_unaligned(ptr) \
- ({ __typeof__(*(ptr)) __tmp; memmove(&__tmp, (ptr), sizeof(*(ptr))); __tmp; })
-
-#define put_unaligned(val, ptr) \
- ({ __typeof__(*(ptr)) __tmp = (val); \
- memmove((ptr), &__tmp, sizeof(*(ptr))); \
- (void)0; })
+#include <linux/unaligned/no_builtin_memcpy.h>
#endif /* _XTENSA_UNALIGNED_H */
--
1.5.5.144.g3e42
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists