kernel: Move arches to use common unaligned access
Changes
26 files changed · +203 −1115
Only the first 600 diff lines are shown. Download the complete patch.
arch/frv/kernel/traps.c
View filediff --git a/arch/frv/kernel/traps.c b/arch/frv/kernel/traps.c
index a40df80..1d2dfe6 100644
--- a/arch/frv/kernel/traps.c
+++ b/arch/frv/kernel/traps.c
@@ -362,11 +362,8 @@ asmlinkage void memory_access_exception(unsigned long esr0,
#ifdef CONFIG_MMU
unsigned long fixup;
- if ((esr0 & ESRx_EC) == ESRx_EC_DATA_ACCESS)
- if (handle_misalignment(esr0, ear0, epcr0) == 0)
- return;
-
- if ((fixup = search_exception_table(__frame->pc)) != 0) {
+ fixup = search_exception_table(__frame->pc);
+ if (fixup) {
__frame->pc = fixup;
return;
}
arch/frv/mm/unaligned.c
View before deletiondiff --git a/arch/frv/mm/unaligned.c b/arch/frv/mm/unaligned.c
deleted file mode 100644
index 8f0375f..0000000
--- a/arch/frv/mm/unaligned.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/* unaligned.c: unalignment fixup handler for CPUs on which it is supported (FR451 only)
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells ([email protected])
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/sched.h>
-#include <linux/signal.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/types.h>
-#include <linux/user.h>
-#include <linux/string.h>
-#include <linux/linkage.h>
-#include <linux/init.h>
-
-#include <asm/setup.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-
-#if 0
-#define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
-#else
-#define kdebug(fmt, ...) do {} while(0)
-#endif
-
-#define _MA_SIGNED 0x01
-#define _MA_HALF 0x02
-#define _MA_WORD 0x04
-#define _MA_DWORD 0x08
-#define _MA_SZ_MASK 0x0e
-#define _MA_LOAD 0x10
-#define _MA_STORE 0x20
-#define _MA_UPDATE 0x40
-#define _MA_IMM 0x80
-
-#define _MA_LDxU _MA_LOAD | _MA_UPDATE
-#define _MA_LDxI _MA_LOAD | _MA_IMM
-#define _MA_STxU _MA_STORE | _MA_UPDATE
-#define _MA_STxI _MA_STORE | _MA_IMM
-
-static const uint8_t tbl_LDGRk_reg[0x40] = {
- [0x02] = _MA_LOAD | _MA_HALF | _MA_SIGNED, /* LDSH @(GRi,GRj),GRk */
- [0x03] = _MA_LOAD | _MA_HALF, /* LDUH @(GRi,GRj),GRk */
- [0x04] = _MA_LOAD | _MA_WORD, /* LD @(GRi,GRj),GRk */
- [0x05] = _MA_LOAD | _MA_DWORD, /* LDD @(GRi,GRj),GRk */
- [0x12] = _MA_LDxU | _MA_HALF | _MA_SIGNED, /* LDSHU @(GRi,GRj),GRk */
- [0x13] = _MA_LDxU | _MA_HALF, /* LDUHU @(GRi,GRj),GRk */
- [0x14] = _MA_LDxU | _MA_WORD, /* LDU @(GRi,GRj),GRk */
- [0x15] = _MA_LDxU | _MA_DWORD, /* LDDU @(GRi,GRj),GRk */
-};
-
-static const uint8_t tbl_STGRk_reg[0x40] = {
- [0x01] = _MA_STORE | _MA_HALF, /* STH @(GRi,GRj),GRk */
- [0x02] = _MA_STORE | _MA_WORD, /* ST @(GRi,GRj),GRk */
- [0x03] = _MA_STORE | _MA_DWORD, /* STD @(GRi,GRj),GRk */
- [0x11] = _MA_STxU | _MA_HALF, /* STHU @(GRi,GRj),GRk */
- [0x12] = _MA_STxU | _MA_WORD, /* STU @(GRi,GRj),GRk */
- [0x13] = _MA_STxU | _MA_DWORD, /* STDU @(GRi,GRj),GRk */
-};
-
-static const uint8_t tbl_LDSTGRk_imm[0x80] = {
- [0x31] = _MA_LDxI | _MA_HALF | _MA_SIGNED, /* LDSHI @(GRi,d12),GRk */
- [0x32] = _MA_LDxI | _MA_WORD, /* LDI @(GRi,d12),GRk */
- [0x33] = _MA_LDxI | _MA_DWORD, /* LDDI @(GRi,d12),GRk */
- [0x36] = _MA_LDxI | _MA_HALF, /* LDUHI @(GRi,d12),GRk */
- [0x51] = _MA_STxI | _MA_HALF, /* STHI @(GRi,d12),GRk */
- [0x52] = _MA_STxI | _MA_WORD, /* STI @(GRi,d12),GRk */
- [0x53] = _MA_STxI | _MA_DWORD, /* STDI @(GRi,d12),GRk */
-};
-
-
-/*****************************************************************************/
-/*
- * see if we can handle the exception by fixing up a misaligned memory access
- */
-int handle_misalignment(unsigned long esr0, unsigned long ear0, unsigned long epcr0)
-{
- unsigned long insn, addr, *greg;
- int GRi, GRj, GRk, D12, op;
-
- union {
- uint64_t _64;
- uint32_t _32[2];
- uint16_t _16;
- uint8_t _8[8];
- } x;
-
- if (!(esr0 & ESR0_EAV) || !(epcr0 & EPCR0_V) || !(ear0 & 7))
- return -EAGAIN;
-
- epcr0 &= EPCR0_PC;
-
- if (__frame->pc != epcr0) {
- kdebug("MISALIGN: Execution not halted on excepting instruction\n");
- BUG();
- }
-
- if (__get_user(insn, (unsigned long *) epcr0) < 0)
- return -EFAULT;
-
- /* determine the instruction type first */
- switch ((insn >> 18) & 0x7f) {
- case 0x2:
- /* LDx @(GRi,GRj),GRk */
- op = tbl_LDGRk_reg[(insn >> 6) & 0x3f];
- break;
-
- case 0x3:
- /* STx GRk,@(GRi,GRj) */
- op = tbl_STGRk_reg[(insn >> 6) & 0x3f];
- break;
-
- default:
- op = tbl_LDSTGRk_imm[(insn >> 18) & 0x7f];
- break;
- }
-
- if (!op)
- return -EAGAIN;
-
- kdebug("MISALIGN: pc=%08lx insn=%08lx ad=%08lx op=%02x\n", epcr0, insn, ear0, op);
-
- memset(&x, 0xba, 8);
-
- /* validate the instruction parameters */
- greg = (unsigned long *) &__frame->tbr;
-
- GRi = (insn >> 12) & 0x3f;
- GRk = (insn >> 25) & 0x3f;
-
- if (GRi > 31 || GRk > 31)
- return -ENOENT;
-
- if (op & _MA_DWORD && GRk & 1)
- return -EINVAL;
-
- if (op & _MA_IMM) {
- D12 = insn & 0xfff;
- asm ("slli %0,#20,%0 ! srai %0,#20,%0" : "=r"(D12) : "0"(D12)); /* sign extend */
- addr = (GRi ? greg[GRi] : 0) + D12;
- }
- else {
- GRj = (insn >> 0) & 0x3f;
- if (GRj > 31)
- return -ENOENT;
- addr = (GRi ? greg[GRi] : 0) + (GRj ? greg[GRj] : 0);
- }
-
- if (addr != ear0) {
- kdebug("MISALIGN: Calculated addr (%08lx) does not match EAR0 (%08lx)\n",
- addr, ear0);
- return -EFAULT;
- }
-
- /* check the address is okay */
- if (user_mode(__frame) && ___range_ok(ear0, 8) < 0)
- return -EFAULT;
-
- /* perform the memory op */
- if (op & _MA_STORE) {
- /* perform a store */
- x._32[0] = 0;
- if (GRk != 0) {
- if (op & _MA_HALF) {
- x._16 = greg[GRk];
- }
- else {
- x._32[0] = greg[GRk];
- }
- }
- if (op & _MA_DWORD)
- x._32[1] = greg[GRk + 1];
-
- kdebug("MISALIGN: Store GR%d { %08x:%08x } -> %08lx (%dB)\n",
- GRk, x._32[1], x._32[0], addr, op & _MA_SZ_MASK);
-
- if (__memcpy_user((void *) addr, &x, op & _MA_SZ_MASK) != 0)
- return -EFAULT;
- }
- else {
- /* perform a load */
- if (__memcpy_user(&x, (void *) addr, op & _MA_SZ_MASK) != 0)
- return -EFAULT;
-
- if (op & _MA_HALF) {
- if (op & _MA_SIGNED)
- asm ("slli %0,#16,%0 ! srai %0,#16,%0"
- : "=r"(x._32[0]) : "0"(x._16));
- else
- asm ("sethi #0,%0"
- : "=r"(x._32[0]) : "0"(x._16));
- }
-
- kdebug("MISALIGN: Load %08lx (%dB) -> GR%d, { %08x:%08x }\n",
- addr, op & _MA_SZ_MASK, GRk, x._32[1], x._32[0]);
-
- if (GRk != 0)
- greg[GRk] = x._32[0];
- if (op & _MA_DWORD)
- greg[GRk + 1] = x._32[1];
- }
-
- /* update the base pointer if required */
- if (op & _MA_UPDATE)
- greg[GRi] = addr;
-
- /* well... we've done that insn */
- __frame->pc = __frame->pc + 4;
-
- return 0;
-} /* end handle_misalignment() */
include/asm-alpha/unaligned.h
View filediff --git a/include/asm-alpha/unaligned.h b/include/asm-alpha/unaligned.h
index a1d7284..3787c60 100644
--- a/include/asm-alpha/unaligned.h
+++ b/include/asm-alpha/unaligned.h
@@ -1,6 +1,11 @@
-#ifndef __ALPHA_UNALIGNED_H
-#define __ALPHA_UNALIGNED_H
+#ifndef _ASM_ALPHA_UNALIGNED_H
+#define _ASM_ALPHA_UNALIGNED_H
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/le_struct.h>
+#include <linux/unaligned/be_byteshift.h>
+#include <linux/unaligned/generic.h>
-#endif
+#define get_unaligned __get_unaligned_le
+#define put_unaligned __put_unaligned_le
+
+#endif /* _ASM_ALPHA_UNALIGNED_H */
include/asm-arm/unaligned.h
View filediff --git a/include/asm-arm/unaligned.h b/include/asm-arm/unaligned.h
index 5db03cf..44593a8 100644
--- a/include/asm-arm/unaligned.h
+++ b/include/asm-arm/unaligned.h
@@ -1,171 +1,9 @@
-#ifndef __ASM_ARM_UNALIGNED_H
-#define __ASM_ARM_UNALIGNED_H
+#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/le_byteshift.h>
+#include <linux/unaligned/be_byteshift.h>
+#include <linux/unaligned/generic.h>
/*
* Select endianness
@@ -178,4 +16,4 @@ static inline void __put_unaligned_8_be(const unsigned long long __v, register _
#define put_unaligned __put_unaligned_be
#endif
-#endif
+#endif /* _ASM_ARM_UNALIGNED_H */
include/asm-avr32/unaligned.h
View filediff --git a/include/asm-avr32/unaligned.h b/include/asm-avr32/unaligned.h
index 36f5fd4..0418772 100644
--- a/include/asm-avr32/unaligned.h
+++ b/include/asm-avr32/unaligned.h
@@ -1,5 +1,5 @@
-#ifndef __ASM_AVR32_UNALIGNED_H
-#define __ASM_AVR32_UNALIGNED_H
+#ifndef _ASM_AVR32_UNALIGNED_H
+#define _ASM_AVR32_UNALIGNED_H
/*
* AVR32 can handle some unaligned accesses, depending on the
@@ -11,6 +11,11 @@
* optimize word loads in general.
*/
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/be_struct.h>
+#include <linux/unaligned/le_byteshift.h>
+#include <linux/unaligned/generic.h>
-#endif /* __ASM_AVR32_UNALIGNED_H */
+#define get_unaligned __get_unaligned_be
+#define put_unaligned __put_unaligned_be
+
+#endif /* _ASM_AVR32_UNALIGNED_H */
include/asm-blackfin/unaligned.h
View filediff --git a/include/asm-blackfin/unaligned.h b/include/asm-blackfin/unaligned.h
index 10081dc..fd8a1d6 100644
--- a/include/asm-blackfin/unaligned.h
+++ b/include/asm-blackfin/unaligned.h
@@ -1,6 +1,11 @@
-#ifndef __BFIN_UNALIGNED_H
-#define __BFIN_UNALIGNED_H
+#ifndef _ASM_BLACKFIN_UNALIGNED_H
+#define _ASM_BLACKFIN_UNALIGNED_H
-#include <asm-generic/unaligned.h>
+#include <linux/unaligned/le_struct.h>
+#include <linux/unaligned/be_byteshift.h>
+#include <linux/unaligned/generic.h>
-#endif /* __BFIN_UNALIGNED_H */
+#define get_unaligned __get_unaligned_le
+#define put_unaligned __put_unaligned_le
+
+#endif /* _ASM_BLACKFIN_UNALIGNED_H */
include/asm-cris/unaligned.h
View filediff --git a/include/asm-cris/unaligned.h b/include/asm-cris/unaligned.h
index 7fbbb39..7b3f3fe 100644
--- a/include/asm-cris/unaligned.h
+++ b/include/asm-cris/unaligned.h
@@ -1,16 +1,13 @@
-#ifndef __CRIS_UNALIGNED_H
-#define __CRIS_UNALIGNED_H
+#ifndef _ASM_CRIS_UNALIGNED_H
+#define _ASM_CRIS_UNALIGNED_H
/*
* 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.
*/
+#include <linux/unaligned/access_ok.h>
+#include <linux/unaligned/generic.h>
-#define get_unaligned(ptr) (*(ptr))
+#define get_unaligned __get_unaligned_le
+#define put_unaligned __put_unaligned_le
-#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
-
-#endif
+#endif /* _ASM_CRIS_UNALIGNED_H */
include/asm-frv/unaligned.h
View filediff --git a/include/asm-frv/unaligned.h b/include/asm-frv/unaligned.h
index dc8e9c9..64ccc73 100644
--- a/include/asm-frv/unaligned.h
+++ b/include/asm-frv/unaligned.h
@@ -9,194 +9,14 @@
* 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
+#include <linux/unaligned/le_byteshift.h>
+#include <linux/unaligned/be_byteshift.h>
+#include <linux/unaligned/generic.h>
-/*
- * Unaligned accesses on uClinux can't be performed in a fault handler - the
- * CPU detects them as imprecise exceptions making this impossible.
- *
- * 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.
- */
-#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))); \
-})
-
-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; \
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include/asm-generic/unaligned.h
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include/asm-h8300/unaligned.h
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include/asm-ia64/unaligned.h
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include/asm-m32r/unaligned.h
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include/asm-m68k/unaligned.h
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include/asm-m68knommu/unaligned.h
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include/asm-mips/unaligned.h
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include/asm-mn10300/unaligned.h
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include/asm-parisc/unaligned.h
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include/asm-powerpc/unaligned.h
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include/asm-s390/unaligned.h
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include/asm-sh/unaligned.h
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include/asm-sparc/unaligned.h
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include/asm-sparc64/unaligned.h
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include/asm-um/unaligned.h
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include/asm-v850/unaligned.h
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include/asm-x86/unaligned.h
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include/asm-xtensa/unaligned.h
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