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authorMagnus Damm <magnus.damm@gmail.com>2008-02-07 19:58:46 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-02-14 14:22:09 +0900
commit4252c659a4e7f4260e4bdc87538578236c51ab2d (patch)
tree0b85509081e8ad05db5514bccaa71f384dfa92bd /arch
parent1e6760c5c4589d02a6877fb256b99c33dd8f1ede (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/kernel/traps_32.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index 7154a7b2135..2e7dd2ebec9 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -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
}