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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | /* 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> #include <asm/unwind_hints.h> .section .noinstr.text, "ax" SYM_FUNC_START(memcpy) /* * Some CPUs support hardware unaligned access */ ALTERNATIVE "b __memcpy_generic", \ "b __memcpy_fast", CPU_FEATURE_UAL SYM_FUNC_END(memcpy) SYM_FUNC_ALIAS(__memcpy, memcpy) EXPORT_SYMBOL(memcpy) EXPORT_SYMBOL(__memcpy) _ASM_NOKPROBE(memcpy) _ASM_NOKPROBE(__memcpy) /* * void *__memcpy_generic(void *dst, const void *src, size_t n) * * a0: dst * a1: src * a2: n */ SYM_FUNC_START(__memcpy_generic) move a3, a0 beqz a2, 2f 1: ld.b t0, a1, 0 st.b t0, a0, 0 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(__memcpy_generic) _ASM_NOKPROBE(__memcpy_generic) .align 5 SYM_FUNC_START_NOALIGN(__memcpy_small) pcaddi t0, 8 slli.d a2, a2, 5 add.d t0, t0, a2 jr t0 .align 5 0: jr ra .align 5 1: ld.b t0, a1, 0 st.b t0, a0, 0 jr ra .align 5 2: ld.h t0, a1, 0 st.h t0, a0, 0 jr ra .align 5 3: ld.h t0, a1, 0 ld.b t1, a1, 2 st.h t0, a0, 0 st.b t1, a0, 2 jr ra .align 5 4: ld.w t0, a1, 0 st.w t0, a0, 0 jr ra .align 5 5: ld.w t0, a1, 0 ld.b t1, a1, 4 st.w t0, a0, 0 st.b t1, a0, 4 jr ra .align 5 6: ld.w t0, a1, 0 ld.h t1, a1, 4 st.w t0, a0, 0 st.h t1, a0, 4 jr ra .align 5 7: ld.w t0, a1, 0 ld.w t1, a1, 3 st.w t0, a0, 0 st.w t1, a0, 3 jr ra .align 5 8: ld.d t0, a1, 0 st.d t0, a0, 0 jr ra SYM_FUNC_END(__memcpy_small) _ASM_NOKPROBE(__memcpy_small) /* * void *__memcpy_fast(void *dst, const void *src, size_t n) * * a0: dst * a1: src * a2: n */ SYM_FUNC_START(__memcpy_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, a0, 7 sub.d t0, zero, t1 addi.d t0, t0, 8 add.d a1, a1, t0 add.d a5, a0, t0 addi.d a4, a3, -64 bgeu a1, a4, .Llt64 /* copy 64 bytes at a time */ .Lloop64: ld.d t0, a1, 0 ld.d t1, a1, 8 ld.d t2, a1, 16 ld.d t3, a1, 24 ld.d t4, a1, 32 ld.d t5, a1, 40 ld.d t6, a1, 48 ld.d t7, a1, 56 addi.d a1, a1, 64 st.d t0, a5, 0 st.d t1, a5, 8 st.d t2, a5, 16 st.d t3, a5, 24 st.d t4, a5, 32 st.d t5, a5, 40 st.d t6, a5, 48 st.d t7, a5, 56 addi.d a5, a5, 64 bltu a1, a4, .Lloop64 /* copy the remaining bytes */ .Llt64: addi.d a4, a3, -32 bgeu a1, a4, .Llt32 ld.d t0, a1, 0 ld.d t1, a1, 8 ld.d t2, a1, 16 ld.d t3, a1, 24 addi.d a1, a1, 32 st.d t0, a5, 0 st.d t1, a5, 8 st.d t2, a5, 16 st.d t3, a5, 24 addi.d a5, a5, 32 .Llt32: addi.d a4, a3, -16 bgeu a1, a4, .Llt16 ld.d t0, a1, 0 ld.d t1, a1, 8 addi.d a1, a1, 16 st.d t0, a5, 0 st.d t1, a5, 8 addi.d a5, a5, 16 .Llt16: addi.d a4, a3, -8 bgeu a1, a4, .Llt8 ld.d t0, a1, 0 st.d t0, a5, 0 .Llt8: st.d a6, a0, 0 st.d a7, a2, -8 /* return */ jr ra SYM_FUNC_END(__memcpy_fast) _ASM_NOKPROBE(__memcpy_fast) STACK_FRAME_NON_STANDARD __memcpy_small |