2026-01-21 18:59:54 +08:00
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/*
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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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*/
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2026-01-29 22:25:33 +08:00
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#include <linux/export.h>
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2026-01-21 18:59:54 +08:00
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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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2026-01-29 22:25:33 +08:00
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PTR_WD 9b, handler; \
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2026-01-21 18:59:54 +08:00
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.previous
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/*
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* Return the size of a string including the ending NUL character up to a
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* maximum of a1 or 0 in case of error.
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*
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* Note: for performance reasons we deliberately accept that a user may
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* make strlen_user and strnlen_user access the first few KSEG0
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* bytes. There's nothing secret there. On 64-bit accessing beyond
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* the maximum is a tad hairier ...
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*/
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2026-01-29 22:25:33 +08:00
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LEAF(__strnlen_user_asm)
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2026-01-21 18:59:54 +08:00
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move v0, a0
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PTR_ADDU a1, a0 # stop pointer
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1:
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#ifdef CONFIG_CPU_DADDI_WORKAROUNDS
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.set noat
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li AT, 1
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#endif
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beq v0, a1, 1f # limit reached?
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2026-01-29 22:25:33 +08:00
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#ifdef CONFIG_EVA
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.set push
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.set eva
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EX(lbe, t0, (v0), .Lfault)
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.set pop
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#else
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EX(lb, t0, (v0), .Lfault)
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#endif
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.set noreorder
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bnez t0, 1b
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1:
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#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
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PTR_ADDIU v0, 1
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#else
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PTR_ADDU v0, AT
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.set at
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#endif
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.set reorder
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PTR_SUBU v0, a0
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jr ra
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2026-01-29 22:25:33 +08:00
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END(__strnlen_user_asm)
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2026-01-21 18:59:54 +08:00
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.Lfault:
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2026-01-21 18:59:54 +08:00
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move v0, zero
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jr ra
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2026-01-29 22:25:33 +08:00
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EXPORT_SYMBOL(__strnlen_user_asm)
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