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Commit b0ce4bd5 authored by Leonid Yegoshin's avatar Leonid Yegoshin Committed by Markos Chandras
Browse files

MIPS: lib: memcpy: Add MIPS R6 support 



MIPS R6 does not support the unaligned load and store instructions
so we add a special MIPS R6 case to copy one byte at a time if we
need to read/write to unaligned memory addresses.

Signed-off-by: default avatarLeonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent fee313d4

arch/mips/lib/memcpy.S

+23 −0
Original line number Diff line number Diff line
@@ -293,9 +293,14 @@ 
	 and	t0, src, ADDRMASK

	PREFS(	0, 2*32(src) )

	PREFD(	1, 2*32(dst) )

#ifndef CONFIG_CPU_MIPSR6

	bnez	t1, .Ldst_unaligned\@

	 nop

	bnez	t0, .Lsrc_unaligned_dst_aligned\@

#else

	or	t0, t0, t1

	bnez	t0, .Lcopy_unaligned_bytes\@

#endif

	/*

	 * use delay slot for fall-through

	 * src and dst are aligned; need to compute rem
@@ -376,6 +381,7 @@ 
	bne	rem, len, 1b

	.set	noreorder



#ifndef CONFIG_CPU_MIPSR6

	/*

	 * src and dst are aligned, need to copy rem bytes (rem < NBYTES)

	 * A loop would do only a byte at a time with possible branch
@@ -477,6 +483,7 @@ 
	bne	len, rem, 1b

	.set	noreorder



#endif /* !CONFIG_CPU_MIPSR6 */

.Lcopy_bytes_checklen\@:

	beqz	len, .Ldone\@

	 nop
@@ -504,6 +511,22 @@ 
.Ldone\@:

	jr	ra

	 nop



#ifdef CONFIG_CPU_MIPSR6

.Lcopy_unaligned_bytes\@:

1:

	COPY_BYTE(0)

	COPY_BYTE(1)

	COPY_BYTE(2)

	COPY_BYTE(3)

	COPY_BYTE(4)

	COPY_BYTE(5)

	COPY_BYTE(6)

	COPY_BYTE(7)

	ADD	src, src, 8

	b	1b

	 ADD	dst, dst, 8

#endif /* CONFIG_CPU_MIPSR6 */

	.if __memcpy == 1

	END(memcpy)

	.set __memcpy, 0