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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 | /* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2020-2022 Loongson Technology Corporation Limited */ #include <asm/alternative-asm.h> #include <asm/asm.h> #include <asm/asmmacro.h> #include <asm/cpu.h> #include <asm/export.h> #include <asm/regdef.h> SYM_FUNC_START(memmove) blt a0, a1, 1f /* dst < src, memcpy */ blt a1, a0, 3f /* src < dst, rmemcpy */ jr ra /* dst == src, return */ /* if (src - dst) < 64, copy 1 byte at a time */ 1: ori a3, zero, 64 sub.d t0, a1, a0 blt t0, a3, 2f b memcpy 2: b __memcpy_generic /* if (dst - src) < 64, copy 1 byte at a time */ 3: ori a3, zero, 64 sub.d t0, a0, a1 blt t0, a3, 4f b rmemcpy 4: b __rmemcpy_generic SYM_FUNC_END(memmove) EXPORT_SYMBOL(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) /* * 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) /* * void *__rmemcpy_fast(void *dst, const void *src, size_t n) * * a0: dst * a1: src * a2: n */ SYM_FUNC_START(__rmemcpy_fast) move a3, a0 beqz a2, 3f add.d a0, a0, a2 add.d a1, a1, a2 ori a4, zero, 64 blt a2, a4, 2f /* copy 64 bytes at a time */ 1: ld.d t0, a1, -8 ld.d t1, a1, -16 ld.d t2, a1, -24 ld.d t3, a1, -32 ld.d t4, a1, -40 ld.d t5, a1, -48 ld.d t6, a1, -56 ld.d t7, a1, -64 st.d t0, a0, -8 st.d t1, a0, -16 st.d t2, a0, -24 st.d t3, a0, -32 st.d t4, a0, -40 st.d t5, a0, -48 st.d t6, a0, -56 st.d t7, a0, -64 addi.d a0, a0, -64 addi.d a1, a1, -64 addi.d a2, a2, -64 bge a2, a4, 1b beqz a2, 3f /* copy the remaining bytes */ 2: 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, 2b /* return */ 3: move a0, a3 jr ra SYM_FUNC_END(__rmemcpy_fast) |