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129 lines
2.3 KiB
ArmAsm
129 lines
2.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2021 Loongson Technology Corporation Limited
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*/
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#include <asm/alternative-asm.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/cpu.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 v0, 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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SYM_FUNC_START(__copy_user)
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/*
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* Some CPUs support hardware unaligned access
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*/
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ALTERNATIVE "b __copy_user_generic", \
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"b __copy_user_fast", CPU_FEATURE_UAL
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SYM_FUNC_END(__copy_user)
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EXPORT_SYMBOL(__copy_user)
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/*
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* unsigned long __copy_user_generic(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_generic)
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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 v0, 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_generic)
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/*
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* unsigned long __copy_user_fast(void *to, const void *from, unsigned long 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_fast)
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beqz a2, 19f
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ori a3, zero, 64
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blt a2, a3, 17f
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/* copy 64 bytes at a time */
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1: ld.d t0, a1, 0
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2: ld.d t1, a1, 8
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3: ld.d t2, a1, 16
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4: ld.d t3, a1, 24
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5: ld.d t4, a1, 32
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6: ld.d t5, a1, 40
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7: ld.d t6, a1, 48
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8: ld.d t7, a1, 56
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9: st.d t0, a0, 0
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10: st.d t1, a0, 8
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11: st.d t2, a0, 16
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12: st.d t3, a0, 24
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13: st.d t4, a0, 32
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14: st.d t5, a0, 40
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15: st.d t6, a0, 48
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16: st.d t7, a0, 56
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addi.d a0, a0, 64
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addi.d a1, a1, 64
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addi.d a2, a2, -64
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bge a2, a3, 1b
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beqz a2, 19f
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/* copy the remaining bytes */
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17: ld.b t0, a1, 0
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18: 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, 17b
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/* return */
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19: move v0, a2
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jr ra
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/* fixup and ex_table */
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fixup_ex 1, 20, 0, 1
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fixup_ex 2, 21, -8, 1
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fixup_ex 3, 22, -16, 1
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fixup_ex 4, 23, -24, 1
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fixup_ex 5, 24, -32, 1
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fixup_ex 6, 25, -40, 1
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fixup_ex 7, 26, -48, 1
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fixup_ex 8, 27, -56, 1
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fixup_ex 9, 20, 0, 0
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fixup_ex 10, 21, -8, 0
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fixup_ex 11, 22, -16, 0
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fixup_ex 12, 23, -24, 0
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fixup_ex 13, 24, -32, 0
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fixup_ex 14, 25, -40, 0
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fixup_ex 15, 26, -48, 0
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fixup_ex 16, 27, -56, 0
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fixup_ex 17, 20, 0, 0
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fixup_ex 18, 20, 0, 0
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SYM_FUNC_END(__copy_user_fast)
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