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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
ARC: Handle un-aligned user space access in BE.
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>
authored by
Noam Camus
and committed by
Vineet Gupta
7d669a19
947bf103
+19
-7
+19
-7
arch/arc/kernel/unaligned.c
+19
-7
arch/arc/kernel/unaligned.c
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#include <linux/uaccess.h>
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#include <asm/disasm.h>
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define BE 1
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#define FIRST_BYTE_16 "swap %1, %1\n swape %1, %1\n"
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#define FIRST_BYTE_32 "swape %1, %1\n"
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#else
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#define BE 0
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#define FIRST_BYTE_16
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#define FIRST_BYTE_32
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#endif
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#define __get8_unaligned_check(val, addr, err) \
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__asm__( \
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"1: ldb.ab %1, [%2, 1]\n" \
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do { \
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unsigned int err = 0, v, a = addr; \
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__get8_unaligned_check(v, a, err); \
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val = v ; \
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val = v << ((BE) ? 8 : 0); \
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__get8_unaligned_check(v, a, err); \
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val |= v << 8; \
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val |= v << ((BE) ? 0 : 8); \
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if (err) \
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goto fault; \
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} while (0)
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do { \
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unsigned int err = 0, v, a = addr; \
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__get8_unaligned_check(v, a, err); \
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val = v << 0; \
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val = v << ((BE) ? 24 : 0); \
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__get8_unaligned_check(v, a, err); \
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val |= v << 8; \
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val |= v << ((BE) ? 16 : 8); \
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__get8_unaligned_check(v, a, err); \
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val |= v << 16; \
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val |= v << ((BE) ? 8 : 16); \
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__get8_unaligned_check(v, a, err); \
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val |= v << 24; \
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val |= v << ((BE) ? 0 : 24); \
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if (err) \
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goto fault; \
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} while (0)
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unsigned int err = 0, v = val, a = addr;\
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\
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__asm__( \
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FIRST_BYTE_16 \
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"1: stb.ab %1, [%2, 1]\n" \
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" lsr %1, %1, 8\n" \
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"2: stb %1, [%2]\n" \
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#define put32_unaligned_check(val, addr) \
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do { \
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unsigned int err = 0, v = val, a = addr;\
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__asm__( \
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\
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__asm__( \
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FIRST_BYTE_32 \
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"1: stb.ab %1, [%2, 1]\n" \
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" lsr %1, %1, 8\n" \
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"2: stb.ab %1, [%2, 1]\n" \