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Commit 7d669a19 authored by Noam Camus's avatar Noam Camus Committed by Vineet Gupta
Browse files

ARC: Handle un-aligned user space access in BE. 



Adding endian awarness to un-aligned access exception handling.

Signed-off-by: default avatarNoam Camus <noamc@ezchip.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 947bf103

arch/arc/kernel/unaligned.c

+19 −7
Original line number Diff line number Diff line
@@ -16,6 +16,16 @@ 
#include <linux/uaccess.h>

#include <asm/disasm.h>



#ifdef CONFIG_CPU_BIG_ENDIAN

#define BE		1

#define FIRST_BYTE_16	"swap %1, %1\n swape %1, %1\n"

#define FIRST_BYTE_32	"swape %1, %1\n"

#else

#define BE		0

#define FIRST_BYTE_16

#define FIRST_BYTE_32

#endif



#define __get8_unaligned_check(val, addr, err)		\

	__asm__(					\

	"1:	ldb.ab	%1, [%2, 1]\n"			\
@@ -36,9 +46,9 @@ 
	do {						\

		unsigned int err = 0, v, a = addr;	\

		__get8_unaligned_check(v, a, err);	\

		val =  v ;				\

		val =  v << ((BE) ? 8 : 0);		\

		__get8_unaligned_check(v, a, err);	\

		val |= v << 8;				\

		val |= v << ((BE) ? 0 : 8);		\

		if (err)				\

			goto fault;			\

	} while (0)
@@ -47,13 +57,13 @@ 
	do {						\

		unsigned int err = 0, v, a = addr;	\

		__get8_unaligned_check(v, a, err);	\

		val =  v << 0;				\

		val =  v << ((BE) ? 24 : 0);		\

		__get8_unaligned_check(v, a, err);	\

		val |= v << 8;				\

		val |= v << ((BE) ? 16 : 8);		\

		__get8_unaligned_check(v, a, err);	\

		val |= v << 16;				\

		val |= v << ((BE) ? 8 : 16);		\

		__get8_unaligned_check(v, a, err);	\

		val |= v << 24;				\

		val |= v << ((BE) ? 0 : 24);		\

		if (err)				\

			goto fault;			\

	} while (0)
@@ -63,6 +73,7 @@ 
		unsigned int err = 0, v = val, a = addr;\

							\

		__asm__(				\

		FIRST_BYTE_16				\

		"1:	stb.ab	%1, [%2, 1]\n"		\

		"	lsr %1, %1, 8\n"		\

		"2:	stb	%1, [%2]\n"		\
@@ -87,8 +98,9 @@ 
#define put32_unaligned_check(val, addr)		\

	do {						\

		unsigned int err = 0, v = val, a = addr;\

		__asm__(				\

							\

		__asm__(				\

		FIRST_BYTE_32				\

		"1:	stb.ab	%1, [%2, 1]\n"		\

		"	lsr %1, %1, 8\n"		\

		"2:	stb.ab	%1, [%2, 1]\n"		\