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

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Adding endian awarness to un-aligned access exception handling.

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Noam Camus 2012-09-10 15:13:19 +03:00 committed by Vineet Gupta
parent 947bf103fc
commit 7d669a193b
1 changed files with 19 additions and 7 deletions
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26
arch/arc/kernel/unaligned.c
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@ -16,6 +16,16 @@
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <asm/disasm.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) \ #define __get8_unaligned_check(val, addr, err) \
__asm__( \ __asm__( \
"1: ldb.ab %1, [%2, 1]\n" \ "1: ldb.ab %1, [%2, 1]\n" \
@ -36,9 +46,9 @@
do { \ do { \
unsigned int err = 0, v, a = addr; \ unsigned int err = 0, v, a = addr; \
__get8_unaligned_check(v, a, err); \ __get8_unaligned_check(v, a, err); \
val = v ; \ val = v << ((BE) ? 8 : 0); \
__get8_unaligned_check(v, a, err); \ __get8_unaligned_check(v, a, err); \
val |= v << 8; \ val |= v << ((BE) ? 0 : 8); \
if (err) \ if (err) \
goto fault; \ goto fault; \
} while (0) } while (0)
@ -47,13 +57,13 @@
do { \ do { \
unsigned int err = 0, v, a = addr; \ unsigned int err = 0, v, a = addr; \
__get8_unaligned_check(v, a, err); \ __get8_unaligned_check(v, a, err); \
val = v << 0; \ val = v << ((BE) ? 24 : 0); \
__get8_unaligned_check(v, a, err); \ __get8_unaligned_check(v, a, err); \
val |= v << 8; \ val |= v << ((BE) ? 16 : 8); \
__get8_unaligned_check(v, a, err); \ __get8_unaligned_check(v, a, err); \
val |= v << 16; \ val |= v << ((BE) ? 8 : 16); \
__get8_unaligned_check(v, a, err); \ __get8_unaligned_check(v, a, err); \
val |= v << 24; \ val |= v << ((BE) ? 0 : 24); \
if (err) \ if (err) \
goto fault; \ goto fault; \
} while (0) } while (0)
@ -63,6 +73,7 @@
unsigned int err = 0, v = val, a = addr;\ unsigned int err = 0, v = val, a = addr;\
\ \
__asm__( \ __asm__( \
FIRST_BYTE_16 \
"1: stb.ab %1, [%2, 1]\n" \ "1: stb.ab %1, [%2, 1]\n" \
" lsr %1, %1, 8\n" \ " lsr %1, %1, 8\n" \
"2: stb %1, [%2]\n" \ "2: stb %1, [%2]\n" \
@ -87,8 +98,9 @@
#define put32_unaligned_check(val, addr) \ #define put32_unaligned_check(val, addr) \
do { \ do { \
unsigned int err = 0, v = val, a = addr;\ unsigned int err = 0, v = val, a = addr;\
__asm__( \
\ \
__asm__( \
FIRST_BYTE_32 \
"1: stb.ab %1, [%2, 1]\n" \ "1: stb.ab %1, [%2, 1]\n" \
" lsr %1, %1, 8\n" \ " lsr %1, %1, 8\n" \
"2: stb.ab %1, [%2, 1]\n" \ "2: stb.ab %1, [%2, 1]\n" \