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Commit 86c0179c authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

sh: break out unaligned sign extension code 



Break out the sign extension code since it's used in multiple places.

Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 1cfb629c

arch/sh/kernel/traps_32.c

+23 −45
Original line number Diff line number Diff line
@@ -147,6 +147,21 @@ static int die_if_no_fixup(const char * str, struct pt_regs * regs, long err) 
	return -EFAULT;

}



static inline void sign_extend(unsigned int count, unsigned char *dst)

{

#ifdef __LITTLE_ENDIAN__

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

		dst[2] = 0xff;

		dst[3] = 0xff;

	}

#else

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

		dst[0] = 0xff;

		dst[1] = 0xff;

	}

#endif

}



/*

 * handle an instruction that does an unaligned memory access by emulating the

 * desired behaviour
@@ -178,25 +193,13 @@ static int handle_unaligned_ins(u16 instruction, struct pt_regs *regs) 
			dst = (unsigned char*) rn;

			*(unsigned long*)dst = 0;



#ifdef __LITTLE_ENDIAN__

			if (copy_from_user(dst, src, count))

				goto fetch_fault;



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

				dst[2] = 0xff;

				dst[3] = 0xff;

			}

#else

#if !defined(__LITTLE_ENDIAN__)

			dst += 4-count;



			if (__copy_user(dst, src, count))

#endif

			if (copy_from_user(dst, src, count))

				goto fetch_fault;



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

				dst[0] = 0xff;

				dst[1] = 0xff;

			}

#endif

			sign_extend(count, dst);

		} else {

			/* to memory */

			src = (unsigned char*) rm;
@@ -253,25 +256,12 @@ static int handle_unaligned_ins(u16 instruction, struct pt_regs *regs) 
		dst = (unsigned char*) rn;

		*(unsigned long*)dst = 0;



#ifdef __LITTLE_ENDIAN__

		if (copy_from_user(dst, src, count))

			goto fetch_fault;



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

			dst[2] = 0xff;

			dst[3] = 0xff;

		}

#else

#if !defined(__LITTLE_ENDIAN__)

		dst += 4-count;



#endif

		if (copy_from_user(dst, src, count))

			goto fetch_fault;



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

			dst[0] = 0xff;

			dst[1] = 0xff;

		}

#endif

		sign_extend(count, dst);

		ret = 0;

		break;
@@ -299,21 +289,9 @@ static int handle_unaligned_ins(u16 instruction, struct pt_regs *regs) 
#if !defined(__LITTLE_ENDIAN__)

			dst += 2;

#endif



			if (copy_from_user(dst, src, 2))

				goto fetch_fault;



#ifdef __LITTLE_ENDIAN__

			if (dst[1] & 0x80) {

				dst[2] = 0xff;

				dst[3] = 0xff;

			}

#else

			if (dst[2] & 0x80) {

				dst[0] = 0xff;

				dst[1] = 0xff;

			}

#endif

			sign_extend(2, dst);

			ret = 0;

			break;

		}