forked from luck/tmp_suning_uos_patched
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: Steven J. Hill <Steven.Hill@imgtec.com>
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@ -3,7 +3,8 @@
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 1996, 1999 by Ralf Baechle
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* Copyright (C) 1996, 1999 by Ralf Baechle
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* Copyright (C) 2011 MIPS Technologies, Inc.
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*/
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#include <linux/errno.h>
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#include <asm/asm.h>
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@ -33,26 +34,27 @@ LEAF(__strncpy_from_user_asm)
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bnez v0, .Lfault
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FEXPORT(__strncpy_from_user_nocheck_asm)
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move v0, zero
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move v1, a1
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.set noreorder
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1: EX(lbu, t0, (v1), .Lfault)
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move t0, zero
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move v1, a1
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1: EX(lbu, v0, (v1), .Lfault)
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PTR_ADDIU v1, 1
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R10KCBARRIER(0(ra))
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beqz t0, 2f
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sb t0, (a0)
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PTR_ADDIU v0, 1
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.set reorder
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beqz v0, 2f
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sb v0, (a0)
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PTR_ADDIU t0, 1
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bne t0, a2, 1b
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PTR_ADDIU a0, 1
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bne v0, a2, 1b
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2: PTR_ADDU t0, a1, v0
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xor t0, a1
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bltz t0, .Lfault
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2: PTR_ADDU v0, a1, t0
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xor v0, a1
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bltz v0, .Lfault
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nop
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jr ra # return n
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move v0, t0
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END(__strncpy_from_user_asm)
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.Lfault: li v0, -EFAULT
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jr ra
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.Lfault: jr ra
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li v0, -EFAULT
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.section __ex_table,"a"
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PTR 1b, .Lfault
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