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Commit 0131f2b2 authored by Steven J. Hill's avatar Steven J. Hill Committed by Ralf Baechle
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MIPS: microMIPS: Optimise 'strncpy' core library function. 



Optimise 'strncpy' to use microMIPS instructions and/or optimisations
for binary size reduction. When the microMIPS ISA is not being used,
the library function compiles to the original binary code.

Signed-off-by: default avatarSteven J. Hill <Steven.Hill@imgtec.com>
parent 26c5e07d

arch/mips/lib/strncpy_user.S

+17 −15
Original line number Diff line number Diff line
@@ -3,7 +3,8 @@ 
 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (c) 1996, 1999 by Ralf Baechle

 * Copyright (C) 1996, 1999 by Ralf Baechle

 * Copyright (C) 2011 MIPS Technologies, Inc.

 */

#include <linux/errno.h>

#include <asm/asm.h>
@@ -33,26 +34,27 @@ LEAF(__strncpy_from_user_asm) 
	bnez		v0, .Lfault



FEXPORT(__strncpy_from_user_nocheck_asm)

	move		v0, zero

	move		v1, a1

	.set		noreorder

1:	EX(lbu, t0, (v1), .Lfault)

	move		t0, zero

	move		v1, a1

1:	EX(lbu, v0, (v1), .Lfault)

	PTR_ADDIU	v1, 1

	R10KCBARRIER(0(ra))

	beqz		t0, 2f

	 sb		t0, (a0)

	PTR_ADDIU	v0, 1

	.set		reorder

	beqz		v0, 2f

	 sb		v0, (a0)

	PTR_ADDIU	t0, 1

	bne		t0, a2, 1b

	 PTR_ADDIU	a0, 1

	bne		v0, a2, 1b

2:	PTR_ADDU	t0, a1, v0

	xor		t0, a1

	bltz		t0, .Lfault

2:	PTR_ADDU	v0, a1, t0

	xor		v0, a1

	bltz		v0, .Lfault

	 nop

	jr		ra			# return n

	 move		v0, t0

	END(__strncpy_from_user_asm)



.Lfault:	li		v0, -EFAULT

	jr		ra

.Lfault: jr		ra

	  li		v0, -EFAULT



	.section	__ex_table,"a"

	PTR		1b, .Lfault