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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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559671e04a
Add some library functions for LoongArch, including: delay, memset, memcpy, memmove, copy_user, strncpy_user, strnlen_user and tlb dump functions. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
47 lines
780 B
ArmAsm
47 lines
780 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/export.h>
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#include <asm/regdef.h>
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.macro fixup_ex from, to, offset, fix
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.if \fix
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.section .fixup, "ax"
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\to: addi.d a0, a2, \offset
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jr ra
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.previous
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.endif
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.section __ex_table, "a"
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PTR \from\()b, \to\()b
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.previous
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.endm
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/*
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* unsigned long __copy_user(void *to, const void *from, size_t n)
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*
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* a0: to
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* a1: from
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* a2: n
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*/
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SYM_FUNC_START(__copy_user)
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beqz a2, 3f
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1: ld.b t0, a1, 0
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2: st.b t0, a0, 0
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addi.d a0, a0, 1
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addi.d a1, a1, 1
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addi.d a2, a2, -1
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bgt a2, zero, 1b
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3: move a0, a2
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jr ra
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fixup_ex 1, 4, 0, 1
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fixup_ex 2, 4, 0, 0
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SYM_FUNC_END(__copy_user)
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EXPORT_SYMBOL(__copy_user)
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