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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | /* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2020-2022 Loongson Technology Corporation Limited */ #include <linux/export.h> #include <asm/alternative-asm.h> #include <asm/asm.h> #include <asm/asmmacro.h> #include <asm/cpu.h> #include <asm/regdef.h> .section .noinstr.text, "ax" SYM_FUNC_START(memmove) blt a0, a1, __memcpy /* dst < src, memcpy */ blt a1, a0, __rmemcpy /* src < dst, rmemcpy */ jr ra /* dst == src, return */ SYM_FUNC_END(memmove) SYM_FUNC_ALIAS(__memmove, memmove) EXPORT_SYMBOL(memmove) EXPORT_SYMBOL(__memmove) _ASM_NOKPROBE(memmove) _ASM_NOKPROBE(__memmove) SYM_FUNC_START(__rmemcpy) /* * Some CPUs support hardware unaligned access */ ALTERNATIVE "b __rmemcpy_generic", \ "b __rmemcpy_fast", CPU_FEATURE_UAL SYM_FUNC_END(__rmemcpy) _ASM_NOKPROBE(__rmemcpy) /* * void *__rmemcpy_generic(void *dst, const void *src, size_t n) * * a0: dst * a1: src * a2: n */ SYM_FUNC_START(__rmemcpy_generic) move a3, a0 beqz a2, 2f add.d a0, a0, a2 add.d a1, a1, a2 1: ld.b t0, a1, -1 st.b t0, a0, -1 addi.d a0, a0, -1 addi.d a1, a1, -1 addi.d a2, a2, -1 bgt a2, zero, 1b 2: move a0, a3 jr ra SYM_FUNC_END(__rmemcpy_generic) _ASM_NOKPROBE(__rmemcpy_generic) /* * void *__rmemcpy_fast(void *dst, const void *src, size_t n) * * a0: dst * a1: src * a2: n */ SYM_FUNC_START(__rmemcpy_fast) sltui t0, a2, 9 bnez t0, __memcpy_small add.d a3, a1, a2 add.d a2, a0, a2 ld.d a6, a1, 0 ld.d a7, a3, -8 /* align up destination address */ andi t1, a2, 7 sub.d a3, a3, t1 sub.d a5, a2, t1 addi.d a4, a1, 64 bgeu a4, a3, .Llt64 /* copy 64 bytes at a time */ .Lloop64: ld.d t0, a3, -8 ld.d t1, a3, -16 ld.d t2, a3, -24 ld.d t3, a3, -32 ld.d t4, a3, -40 ld.d t5, a3, -48 ld.d t6, a3, -56 ld.d t7, a3, -64 addi.d a3, a3, -64 st.d t0, a5, -8 st.d t1, a5, -16 st.d t2, a5, -24 st.d t3, a5, -32 st.d t4, a5, -40 st.d t5, a5, -48 st.d t6, a5, -56 st.d t7, a5, -64 addi.d a5, a5, -64 bltu a4, a3, .Lloop64 /* copy the remaining bytes */ .Llt64: addi.d a4, a1, 32 bgeu a4, a3, .Llt32 ld.d t0, a3, -8 ld.d t1, a3, -16 ld.d t2, a3, -24 ld.d t3, a3, -32 addi.d a3, a3, -32 st.d t0, a5, -8 st.d t1, a5, -16 st.d t2, a5, -24 st.d t3, a5, -32 addi.d a5, a5, -32 .Llt32: addi.d a4, a1, 16 bgeu a4, a3, .Llt16 ld.d t0, a3, -8 ld.d t1, a3, -16 addi.d a3, a3, -16 st.d t0, a5, -8 st.d t1, a5, -16 addi.d a5, a5, -16 .Llt16: addi.d a4, a1, 8 bgeu a4, a3, .Llt8 ld.d t0, a3, -8 st.d t0, a5, -8 .Llt8: st.d a6, a0, 0 st.d a7, a2, -8 /* return */ jr ra SYM_FUNC_END(__rmemcpy_fast) _ASM_NOKPROBE(__rmemcpy_fast) |