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603c87977f
kasan does not instrument the assembly function, so it is checked in advance before calling. If Kasan is not turned on, the speed and space will be almost unchanged under compiler optimization. Signed-off-by: anjiahao <anjiahao@xiaomi.com>
113 lines
2.1 KiB
ArmAsm
113 lines
2.1 KiB
ArmAsm
/****************************************************************************
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* libs/libc/machine/risc-v/gnu/arch_memset.S
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*
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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* SPDX-FileCopyrightText: 2017 SiFive Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the FreeBSD License. This program is distributed in the hope that
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* it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
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* including the implied warranties of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE. A copy of this license is available at
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* http://www.opensource.org/licenses.
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*
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****************************************************************************/
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#include "libc.h"
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#ifdef LIBC_BUILD_MEMSET
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.text
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.global ARCH_LIBCFUN(memset)
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.type ARCH_LIBCFUN(memset), @function
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ARCH_LIBCFUN(memset):
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li t1, 15
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move a4, a0
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bleu a2, t1, .Ltiny
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and a5, a4, 15
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bnez a5, .Lmisaligned
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.Laligned:
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bnez a1, .Lwordify
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.Lwordified:
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and a3, a2, ~15
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and a2, a2, 15
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add a3, a3, a4
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#if __riscv_xlen == 64
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1:
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sd a1, 0(a4)
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sd a1, 8(a4)
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#else
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1:
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sw a1, 0(a4)
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sw a1, 4(a4)
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sw a1, 8(a4)
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sw a1, 12(a4)
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#endif
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add a4, a4, 16
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bltu a4, a3, 1b
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bnez a2, .Ltiny
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ret
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.Ltiny:
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sub a3, t1, a2
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sll a3, a3, 2
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1:
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auipc t0, %pcrel_hi(.Ltable)
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add a3, a3, t0
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.option push
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.option norvc
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.Ltable_misaligned:
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jr a3, %pcrel_lo(1b)
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.Ltable:
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sb a1,14(a4)
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sb a1,13(a4)
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sb a1,12(a4)
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sb a1,11(a4)
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sb a1,10(a4)
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sb a1, 9(a4)
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sb a1, 8(a4)
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sb a1, 7(a4)
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sb a1, 6(a4)
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sb a1, 5(a4)
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sb a1, 4(a4)
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sb a1, 3(a4)
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sb a1, 2(a4)
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sb a1, 1(a4)
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sb a1, 0(a4)
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.option pop
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ret
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.Lwordify:
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and a1, a1, 0xFF
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sll a3, a1, 8
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or a1, a1, a3
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sll a3, a1, 16
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or a1, a1, a3
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#if __riscv_xlen == 64
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sll a3, a1, 32
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or a1, a1, a3
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#endif
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j .Lwordified
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.Lmisaligned:
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sll a3, a5, 2
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1:
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auipc t0, %pcrel_hi(.Ltable_misaligned)
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add a3, a3, t0
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mv t0, ra
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jalr a3, %pcrel_lo(1b)
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mv ra, t0
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add a5, a5, -16
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sub a4, a4, a5
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add a2, a2, a5
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bleu a2, t1, .Ltiny
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j .Laligned
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.size ARCH_LIBCFUN(memset), .-ARCH_LIBCFUN(memset)
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#endif
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