b1bac37345
Optimise 'strlen' 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>
40 lines
915 B
ArmAsm
40 lines
915 B
ArmAsm
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1996, 1998, 1999, 2004 by Ralf Baechle
|
|
* Copyright (C) 1999 Silicon Graphics, Inc.
|
|
* Copyright (C) 2011 MIPS Technologies, Inc.
|
|
*/
|
|
#include <asm/asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/regdef.h>
|
|
|
|
#define EX(insn,reg,addr,handler) \
|
|
9: insn reg, addr; \
|
|
.section __ex_table,"a"; \
|
|
PTR 9b, handler; \
|
|
.previous
|
|
|
|
/*
|
|
* Return the size of a string (including the ending 0)
|
|
*
|
|
* Return 0 for error
|
|
*/
|
|
LEAF(__strlen_user_asm)
|
|
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
|
|
and v0, a0
|
|
bnez v0, .Lfault
|
|
|
|
FEXPORT(__strlen_user_nocheck_asm)
|
|
move v0, a0
|
|
1: EX(lbu, v1, (v0), .Lfault)
|
|
PTR_ADDIU v0, 1
|
|
bnez v1, 1b
|
|
PTR_SUBU v0, a0
|
|
jr ra
|
|
END(__strlen_user_asm)
|
|
|
|
.Lfault: move v0, zero
|
|
jr ra
|