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: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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@ -150,14 +150,24 @@ static int die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
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static inline void sign_extend(unsigned int count, unsigned char *dst)
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{
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#ifdef __LITTLE_ENDIAN__
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if ((count == 1) && dst[0] & 0x80) {
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dst[1] = 0xff;
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dst[2] = 0xff;
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dst[3] = 0xff;
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}
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if ((count == 2) && dst[1] & 0x80) {
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dst[2] = 0xff;
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dst[3] = 0xff;
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}
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#else
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if ((count == 2) && dst[2] & 0x80) {
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dst[0] = 0xff;
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if ((count == 1) && dst[3] & 0x80) {
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dst[2] = 0xff;
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dst[1] = 0xff;
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dst[0] = 0xff;
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}
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if ((count == 2) && dst[2] & 0x80) {
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dst[1] = 0xff;
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dst[0] = 0xff;
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}
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#endif
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}
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