mirror of https://gitee.com/openkylin/linux.git
62 lines
1.2 KiB
ArmAsm
62 lines
1.2 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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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, 1998, 1999, 2004 by Ralf Baechle
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Copyright (C) 2011 MIPS Technologies, Inc.
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*/
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#include <asm/asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/regdef.h>
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#define EX(insn,reg,addr,handler) \
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9: insn reg, addr; \
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.section __ex_table,"a"; \
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PTR 9b, handler; \
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.previous
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/*
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* Return the size of a string (including the ending 0)
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*
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* Return 0 for error
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*/
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.macro __BUILD_STRLEN_ASM func
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LEAF(__strlen_\func\()_asm)
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LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
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and v0, a0
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bnez v0, .Lfault\@
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move v0, a0
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.ifeqs "\func", "kernel"
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1: EX(lbu, v1, (v0), .Lfault\@)
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.else
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1: EX(lbue, v1, (v0), .Lfault\@)
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.endif
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PTR_ADDIU v0, 1
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bnez v1, 1b
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PTR_SUBU v0, a0
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jr ra
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END(__strlen_\func\()_asm)
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.Lfault\@: move v0, zero
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jr ra
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.endm
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#ifndef CONFIG_EVA
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/* Set aliases */
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.global __strlen_user_asm
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.set __strlen_user_asm, __strlen_kernel_asm
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#endif
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__BUILD_STRLEN_ASM kernel
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#ifdef CONFIG_EVA
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.set push
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.set eva
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__BUILD_STRLEN_ASM user
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.set pop
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#endif
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