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nds32: Fix the unaligned access handler 

If the kernel config 'CONFIG_ALIGNMENT_TRAP' and the file
'/proc/sys/nds32/unaligned_access/enable' are set, the kernel
unaligned access handler does not handle correctly when the
value of immediate field is negative. This commit fixes the
unaligned access handler in kernel.

Signed-off-by: Nickhu <nickhu@andestech.com>
Reviewed-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Nickhu 2018-05-03 10:15:56 +08:00 committed by Greentime Hu
parent b3a75846a5
commit 1613de8a78
1 changed files with 5 additions and 2 deletions
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7
arch/nds32/mm/alignment.c
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@ -19,7 +19,7 @@
#define RA(inst) (((inst) >> 15) & 0x1FUL)
#define RB(inst) (((inst) >> 10) & 0x1FUL)
#define SV(inst) (((inst) >> 8) & 0x3UL)
#define IMM(inst) (((inst) >> 0) & 0x3FFFUL)
#define IMM(inst) (((inst) >> 0) & 0x7FFFUL)
#define RA3(inst) (((inst) >> 3) & 0x7UL)
#define RT3(inst) (((inst) >> 6) & 0x7UL)
@ -28,6 +28,9 @@
#define RA5(inst) (((inst) >> 0) & 0x1FUL)
#define RT4(inst) (((inst) >> 5) & 0xFUL)
#define GET_IMMSVAL(imm_value) \
(((imm_value >> 14) & 0x1) ? (imm_value - 0x8000) : imm_value)
#define __get8_data(val,addr,err) \
__asm__( \
"1: lbi.bi %1, [%2], #1\n" \
@ -467,7 +470,7 @@ static inline int do_32(unsigned long inst, struct pt_regs *regs)
}
if (imm)
shift = IMM(inst) * len;
shift = GET_IMMSVAL(IMM(inst)) * len;
else
shift = *idx_to_addr(regs, RB(inst)) << SV(inst);