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Commit 4252c659 authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
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sh: add byte support to the sign extension code 



This patch adds byte support to the sign extension code. Unaligned access
traps should never be generated on 8-bit io operations, but we will use this
code for trapped io and we do need byte support there.

Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 1e6760c5

arch/sh/kernel/traps_32.c

+11 −1
Original line number Diff line number Diff line
@@ -150,14 +150,24 @@ static int die_if_no_fixup(const char * str, struct pt_regs * regs, long err) 
static inline void sign_extend(unsigned int count, unsigned char *dst)

{

#ifdef __LITTLE_ENDIAN__

	if ((count == 1) && dst[0] & 0x80) {

		dst[1] = 0xff;

		dst[2] = 0xff;

		dst[3] = 0xff;

	}

	if ((count == 2) && dst[1] & 0x80) {

		dst[2] = 0xff;

		dst[3] = 0xff;

	}

#else

	if ((count == 2) && dst[2] & 0x80) {

	if ((count == 1) && dst[3] & 0x80) {

		dst[2] = 0xff;

		dst[1] = 0xff;

		dst[0] = 0xff;

	}

	if ((count == 2) && dst[2] & 0x80) {

		dst[1] = 0xff;

		dst[0] = 0xff;

	}

#endif

}